Note: Descriptions are shown in the official language in which they were submitted.
CA 02797272 2014-07-07
ANTIMICROBIAL COMPOSITIONS COMPRISING BENZOIC ACID
[1] This application is a division of Canadian Patent Application Serial
No. 2,495,932. The claims of the present application are generally directed to
an
antimicrobial composition that includes an antimicrobial effective amount of a
mixture
including: (a) benzoic acid, or a salt thereof; and (b) 5-g1ucono1actone; and,
optionally,
one or more of: (c) lemon grass oil; (d) cinnamaldehyde; (e) sorbic acid, or a
salt thereof;
(f) erythorbic acid, or a salt thereof; (g) arabinogalactan, also known as
galactoarabinan;
(h) a hexahydro-iso-alpha-acid or tetrahydro-iso-alpha-acid obtained from hops
extracts,
or a mixture thereof; (i) Achillea fragrantissima oil.
[2] Accordingly, the retention of any objects or features which may be
more particularly related to the parent application or a separate divisional
thereof should
not be regarded as rendering the teachings and claiming ambiguous or
inconsistent with
the subject matter defined in the claims of the divisional application
presented herein when
seeking to interpret the scope thereof and the basis in this disclosure for
the claims recited
herein.
Field of the Invention
[3] The present invention relates to (1) antimicrobial compositions, (2)
methods of killing and/or inhibiting the growth or microorganisms, (3)
preserving
products with the same, and (4) methods of potentiating antimicrobial
compositions.
Background of the Invention
[4] Natural products, while often safe, are generally expensive and do
not have biocidal efficacy against a broad spectrum of organisms such as gram
negative
and positive bacteria and fungi. Most natural products are only effective
against gram
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CA 02797272 2012-11-27
positive bacteria at relatively high concentrations and are not effective
against gram
negative bacteria or fungi.
[5] Cinnamaldehyde is a natural product which has been used (1) as a
flavoring agent, (2) in preservative systems, and (3) to control insect and
arachnid
populations. See U.S. Patent Nos. 4,525,480, 5,306,707, 5,536,501, 5,676,958,
and
5,839,224.
[6] There is a continuing need for low cost and safe preservative
systems which are effective against a broad spectrum of microorganisms.
Summary of the Invention
[7] The present invention provides an antimicrobial composition
comprising an antimicrobial effective amount (such as a preservative,
bactericidal, and/or
fungicidal effective amount) of a mixture comprising at least two of:
(a) lemon grass oil;
(b) cinnamaldehyde, cinnamon oil, cinnamomum cassia, cinnamon extract,
cassia leaf oil, 3,4-dihydroxycinnamic acid or salt thereof, or a mixture
thereof;
(c) sorbic acid, or a salt thereof;
(d) erythorbic acid, or a salt thereof
(e) benzoic acid, or a salt thereof;
(f) arabinogalactan, galactoarabinan, or a mixture thereof
(g) a hexahydro-iso-alpha-acid, tetrahydro-iso-alpha-acid, or a mixture
thereof
(h) Achillea fragrantissima oils (Santolina fragrantissima Forssk oils, or
Lavender cotton oils); and
(i) glucono delta lactone.
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Preferably the mixtures of the present invention include an antimicrobial
(e.g.,
preservative, bactericidal, and/or fungicidal) synergistic effective amount of
the
aforementioned ingredients.
According to an aspect of the present invention, there is provided an
antimicrobial composition comprising an antimicrobial effective amount of a
mixture
comprising: (a) benzoic acid, or a salt thereof; (b) 6-g1ucono1actone; and,
optionally, one
or more of: (c) lemon grass oil; (d) cinnamaldehyde; and (e) sorbic
acid, or a salt
thereof; (f) erythorbic acid, or a salt thereof; (g) arabinogalactan, also
known as
galactoarabinan; (h) a hexahydro-iso-alpha-acid or tetrahydro-iso-alpha-acid
obtained
from hops extracts, or a mixture thereof; (i) Achillea fragrantissima oil.
[8] Preferred mixtures of the present invention include, but
are not
limited to, those shown in the table below.
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CA 02797272 2012-11-27
,
Mixture Component (a) Component (b) Component
(c)
No.
1 cinnamaldehyde, lemon grass sorbic acid or a salt -
oil, arabinogalactan, thereof
galactoarabinan, or a mixture
thereof
2 cinnamaldehyde achillea oil, -
arabinogalactan,
galactoarabinan, or a
mixture thereof
3 cinnamaldehyde arabinogalactan, sorbic acid
or salt
galactoarabinan, or a thereof
mixture thereof
4 cinnamaldehyde sorbic acid or a salt -
thereof
cinnamaldehyde erythorbic acid or a salt -
thereof
6 benzoic acid or a salt thereof erythorbic acid or a salt -
(e.g., sodium benzoate) thereof
7 sorbic acid or a salt thereof erythorbic acid or a salt -
thereof
8 cinnamaldehyde, benzoic acid or glucono delta lactone
a salt thereof (e.g., sodium
benzoate), or sorbic acid or a salt
thereof
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CA 02797272 2012-11-27
[9] In all of the aforementioned mixtures containing
erythorbic acid (or
salt thereof) or glucono delta lactone, the erythorbic acid (or salt thereof)
or glucono delta
lactone potentiates the antimicrobial efficacy of the preservative (e.g.,
sorbic acid or
benzoic acid) in the mixture.
[10] Another embodiment is a method of killing and/or inhibiting the
growth of microorganisms on a substrate or in or on a product by applying an
effective
amount of the antimicrobial composition of the present invention to the
substrate or the
product.
[11] Another embodiment is a method for potentiating the antimicrobial
efficacy of an antimicrobial composition containing sorbic acid, benzoic acid,
or salts
thereof, by adding or including erythorbic acid or a salt thereof, or glucono
delta lactone in
the antimicrobial composition.
[12] Yet another embodiment is a product comprising an antimicrobial,
preservative, bactericidal, and/or fungicidal effective amount of the
antimicrobial
composition of the present invention. The product may be a solid or liquid.
The
antimicrobial compositions of the present invention are particularly effective
as
preservatives for personal care products.
[13] Yet another embodiment is a method of preserving a product (e.g., a
personal care product) by incorporating a preservative effective amount of the
antimicrobial composition of the present invention into the product.
[14] Yet another embodiment is a method of killing and/or inhibiting the
growth of tree or other plant fungus on a plant (such as a tree) by applying
an effective
amount of the antimicrobial composition of the present invention to the plant
and/or the
soil surrounding the plant.
[15] Yet another embodiment is a product (preferably a product other
than a foodstuff, pharmaceutical, or cosmetic) comprising a preservative
effective amount
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CA 02797272 2012-11-27
of cinnamaldehyde or erythorbic acid or a salt thereof (e.g., sodium
erythorbate). The
product is generally substantially free or completely free of parabens (such
as
methylparaben, ethylparaben, and propylparaben). The product may be, for
example, a
household (e.g., personal care), industrial, or institutional product.
Preferred personal care
products include, but are not limited to, shampoos, lotions (e.g., body
lotions),
conditioners, and soaps. Suitable household products include, but are not
limited to, fabric
softeners, laundry detergents, and hard surface cleaners. According to one
embodiment,
the product contains less than about 1, 0.5, 0.4, 0.3, 0.25, 0.2, 0.15, 0.1,
0.09, 0.08, 0.07,
0.06, 0.05, 0.04, 0.03, 0.02, or 0.01% by weight of parabens, based upon 100%
total
weight of product. According to one preferred embodiment, the product contains
less than
a smelling effective amount of cinnamaldehyde. The product preferably contains
more
than 0.01, 0.03, 0.05, 0.07, 0.09, or 0.1% by weight of cinnamaldehyde. The
product is
preferably substantially free or completely free of cinnamon oil. According to
one
embodiment, the product does not contain a preservative effective amount of a
preservative other than cinnamaldehyde or erythorbic acid or a salt thereof.
According to
another embodiment, the only preservative in the product is cinnamaldehyde or
erythorbic
acid or a salt thereof.
[16] Yet another embodiment is a method of killing and/or inhibiting the
growth of microorganisms in or on a product (such as a product other than a
foodstuff,
pharmaceutical, or cosmetic) comprising applying an effective amount of
cinnamaldehyde
to the product. The product is preferably substantially free or completely
free of parabens.
[17] Yet another embodiment is a method of preserving a product
(preferably a product other than a foodstuff, pharmaceutical, or cosmetic)
comprising
applying an effective amount of cinnamaldehyde to the product. The product may
be
substantially free or completely free of parabens.
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[18] Yet another embodiment is a method of killing and/or inhibiting the
growth of microorganisms in or on a product (such as (i) a product other than
a foodstuff
or (ii) a product other than a foodstuff, pharmaceutical, or cosmetic)
comprising applying
an effective amount of erythorbic acid or a salt thereof to the product.
[19] Yet another embodiment is a method of preserving a product
(preferably (i) a product other than a foodstuff or (ii) a product other than
a foodstuff,
pharmaceutical, or cosmetic) comprising applying an effective amount of
erythorbic acid
or a salt thereof to the product. The product may be substantially free or
completely free
of parabens.
[20] Yet another embodiment of the present invention is a method of
killing and/or for inhibiting the growth of microorganisms on a substrate by
applying an
antimicrobial or preservative effective amount of cinnamaldehyde or erythorbic
acid or a
salt thereof (preferably without applying any parabens).
[21] Yet another embodiment is a preservative formulation comprising
an antimicrobial synergistic mixture comprising cinnamaldehyde and at least
one
conventional personal care preservative, such as isothiazolinones,
benzisothiazolinones,
and/or formaldehyde donors, such as alkanol substituted dialkylhydantoins.
Preferably,
the alkanol substituted dialkyl hydantoin is a compound of formula:
R3 p
R4 1 f
Ri N yN' R2
0
(V)
wherein R1 and R2 are each independently hydrogen or (CH2)0H, with the proviso
that
both R1 and R2 cannot be hydrogen, and R3 and R4 are each independently
methyl, ethyl,
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CA 02797272 2012-11-27
propyl, or aryl. Preferred alkanol substituted dialkylhydantoins include, but
are not
limited to, 1,3-dimethylo1-5,5-dimethylhydantoin (DMDMH) and monomethylol
dimethylhydantoin (MMDMH). Preferably, the preservative formulation comprises
a
preservative effective amount of the synergistic mixture. According to one
embodiment,
the preservative formulation comprises a batericidally and/or fungicidally
effective
amount of the synergistic mixture. The preservative formulation may contain
less than a
smelling effective amount of cinnamaldehyde. Preferably, the preservative
formulation is
substantially free or completely free of parabens. The preservative
formulation may be
incorporated into a product, such as those discussed in this application.
[22] Yet another embodiment is a method of killing and/or inhibiting the
growth of microorganisms in or on a product (such as a product other than a
foodstuff,
pharmaceutical, or cosmetic) comprising applying an effective amount of the
aforementioned preservative formulation to the product. According to one
embodiment,
the product is substantially free or completely free of parabens.
[23] Yet another embodiment of the present invention is a method of
killing and/or for inhibiting the growth of microorganisms on a substrate by
applying an
antimicrobial or preserving effective amount of the preservative formulation
of the present
invention.
[24] Yet another embodiment is a method of killing and/or inhibiting the
growth of fungi on a substrate comprising applying an effective amount of the
aforementioned preservative formulation to the product. According to one
embodiment,
the product is substantially free or completely free of parabens.
[25] The formulations and products of the present invention preferably
have a pH less than 10, 9, 8.5, or 8.
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Brief Description of the Drawings
[26] Figure 1 is a bar graph of the stability of (a) an unpreserved
shampoo, (b) a shampoo containing 0.5% (w/w) lemon grass oil, (c) a shampoo
containing
1.2% (w/w) potassium sorbate, and (d) a shampoo containing 0.5% (w/w) lemon
grass oil
and 0.3% (w/w) potassium sorbate after 21 days (based on bacterial count); %
stability
based on Bacteria count at Day 21 of test - >105 organisms in formulation
gives less than
10% stability, 103-104 organisms in formulation gives <50% stability, 102-101
organisms
gives >80% stability, and, <10 organisms gives 100% stability.
[27] Figure 2 is a bar graph of the stability of (a) an unpreserved
shampoo, (b) a shampoo containing 0.05% (w/w) cinnamaldehyde, (c) a shampoo
containing 1.2% (w/w) potassium sorbate, (d) a shampoo containing 0.05%
cinnamaldehyde and 0.5% potassium sorbate, and (e) a shampoo containing 0.1%
(w/w)
cinnamaldehyde and 0.5% (w/w) potassium sorbate after 21 days (based on
bacterial
count); % stability based on Bacteria count at Day 21 of test - >105 organisms
in
formulation gives less than 10% stability, 103-104 organisms in formulation
gives <50%
stability, 102-101 organisms gives >80% stability, and, <10 organisms gives
100%
stability.
[28] Figure 3 shows a bar graph of the stability of (a) an unpreserved
shampoo, (b) a shampoo containing 0.05% (w/w) cinnamaldehyde, (c) a shampoo
containing 1.0% (w/w) achillea oil, and (d) a shampoo containing 0.05% (w/w)
cinnamaldehyde and 0.75% (w/w) achillea oil after 21 days (based on bacterial
count); %
stability based on Bacteria count at Day 14 of test - >105 organisms in
formulation gives
less than 10% stability, 103-104 organisms in formulation gives <50%
stability, 102-101
organisms gives >80% stability, and, <10 organisms gives 100% stability.
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CA 02797272 2012-11-27
[29] Figure 4 is a bar graph of the stability of (a) an unpreserved
shampoo, (b) a shampoo containing 0.1% (w/w) cinnamaldehyde, (c) a shampoo
containing 1.0% (w/w) Hexahop Go1dTM, and (d) a shampoo containing 0.1% (w/w)
cinnamaldehyde and 0.4% (w/w) Hexahop Go1dTM after 7 days (based on fungal
count); %
stability based on Fungal count at Day 7 of test -> 104 organisms in
formulation gives less
than 10% stability, 102-103 organisms in formulation gives <50% stability, >10
organisms
gives 80% stability, and <10 organisms gives 100% stability.
[30] Figure 5 is a bar graph of the stability of (a) an unpreserved
shampoo, (b) a shampoo containing 1.0% (w/w) LarexTM (arabinogalactan), (c) a
shampoo containing 0.6% (w/w) potassium sorbate, and (d) a shampoo containing
0.5%
(w/w) LarexTM and 0.5% (w/w) potassium sorbate after 14 days (based on fungal
count);
% stability based on Fungal count at Day 14 of test -> 104 organisms in
formulation gives
less than 10% stability, 102-103 organisms in formulation gives <50%
stability, >10
organisms gives 80% stability, and <10 organisms gives 100% stability.
[31] Figure 6 is a bar graph of the stability of (a) an unpreserved
shampoo, (b) a shampoo containing 0.25% (w/w) lemon grass oil, (c) a shampoo
containing 0.6% (w/w) potassium sorbate, and (d) a shampoo containing 0.1%
(w/w)
lemon grass oil and 0.5% (w/w) potassium sorbate after 7 days (based on fungal
count); %
stability based on Fungal count at Day 7 of test -> 104 organisms in
formulation gives less
than 10% stability, 102-103 organisms in formulation gives <50% stability, >10
organisms
gives 80% stability, and <10 organisms gives 100% stability.
[32] Figure 7 is a bar graph of the stability of (a) an unpreserved
shampoo, (b) a shampoo containing (w/w) Hexahop GO1dTM, (c) a shampoo
containing
0.6% (w/w) potassium sorbate shampoo, (d) a shampoo containing 0.1% (w/w)
cinnamaldehyde, and (e) a shampoo containing 0.3% (w/w) Hexahop Go1dTM, 0.1%
(w/w)
cinnamaldehyde, and 0.6% (w/w) potassium sorbate after 7 days; % stability
based on
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CA 02797272 2012-11-27
Fungal count at Day 7 of test - > 104 organisms in formulation gives less than
10%
stability, 102-103 organisms in formulation gives <50% stability, >10
organisms gives
80% stability, and <10 organisms gives 100% stability.
Detailed Description of the Invention
Definitions
[33] The term "microorganisms" includes, but is not limited to, bacteria,
fungi, yeasts, algae, insects, and pests.
[34] The term "about" or "approximately" means within an acceptable
error range for the particular value as determined by one of ordinary skill in
the art, which
will depend in part on how the value is measured or determined, i.e., the
limitations of the
measurement system. For example, "about" can mean within 1 or more than 1
standard
deviations, per the practice in the art. Alternatively, "about" can mean a
range of up to
20%, preferably up to 10%, more preferably up to 5%, and more preferably still
up to 1%
of a given value. Alternatively, particularly with respect to biological
systems or
processes, the term can mean within an order of magnitude, preferably within 5-
fold, and
more preferably within 2-fold, of a value. Where particular values are
described in the
application and claims, unless otherwise stated the term "about" meaning
within an
acceptable error range for the particular value should be assumed.
[35] The term "personal care products" refers to products intended for
application to the human body, such as to skin, hair, and nails, including,
but not limited
to, shampoos, conditioners, creams, lotions (such as body lotions), cosmetics,
and soaps.
[36] The term "smelling effective amount" refers to a sufficent amount
of an agent incorporated into a product to give the product an odor.
[37] The term "potentiating" refers to the ability of a compound or
composition to enhance or increase the effect of an antimicrobial compound or
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composition. Preferably, the efficacy of the combined mixture is greater than
the additive
effect of the ingredients.
[38] Suitable salts of sorbic acid, erythorbic acid, and benzoic acid
include, but are not limited to, alkali metal or alkali earth metal salts,
such as potassium
and sodium.
Components for Mixtures
[39] Cinnamaldehyde from any source may be used in the present
invention. For example, the cinnamaldehyde may be derived from cinnamon bark
extracts
(such as from bark and leaf), cassia leaf oil, cinnamomum cassia, cinnamon
oils, cinnamal,
cinnamyl alcohol, and mixtures thereof
[40] A preferred salt of sorbic acid is potassium sorbate.
[41] A preferred salt of erythorbic acid is sodium erythorbate.
[42] A preferred salt of benzoic acid is sodium benzoate.
[43] Arabinogalactan and galactoarabinan may be derived from Larex
trees. Arabinogalactan is available as Larex UFTM from Larex Inc. of White
Bear Lake,
MN.
[44] Preferred hexahydro-iso-alpha-acids and tetrahydro-iso-alpha-acids
are those obtained from hops extracts, such as Hexahop GO1dTM (also referred
to as
Hexahop herein) available from John I. Haas, Inc. of Washington, D.C.
[45] A preferred Achillea fragrantissima oils is Achillea oil.
[46] According to a specific embodiment, the antimicroial composition
contains at least 0.1% of sorbic acid, or a salt thereof, such as potassium
sorbate.
Examples of Preferred Mixtures
(i) Cinnamaldehyde and Sorbic Acid, Erythorbic Acid, or a Salt
Thereof
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[47] A preferred mixture is cinnamaldehyde and sorbic acid or a salt
thereof, such as potassium sorbate. Another preferred mixture is
cinnamaldehyde and
erythorbic acid or a salt thereof, such as sodium erythorbate. The weight
ratio of
cinnamaldehyde to (i) sorbic acid or a salt thereof or (ii) erythorbic acid or
a salt thereof is
preferably from about 10:1 to about 0.1:1 and more preferably from about 5:1
to about
0.2:1.
[48] Concentrates of the mixture preferably include from about 2 to
about 40% by weight of cinnamaldehyde and from about 10 to about 60% by weight
of
sorbic acid, erythorbic acid, or a salt thereof, in water, with or without a
hydroxyl co-
solvent (such as glycerin or ethanol, which increase the solubility and
stability of the
cinnamaldehyde in the blends).
[49] Preferably, the pH of formulations including a mixture of (i)
cinnamaldehyde and (ii) sorbic acid, erythorbic, or a salt thereof is less
than 10, 9, 8.5, or
8. At a pH of less than 9, such formulations exhibit improved color stability.
According
to one preferred embodiment, the pH of a formulation containing a mixture of
cinnamaldehyde and sorbic acid, erythorbic acid, or a salt thereof is lowered
with
hydrochloric acid. Preferably, a sufficient amount of hydrochloric acid is
included in the
formulation to lower its pH to less than 9, 8.5, or 8.
[50] A preferred preservative formulation includes from about 5 to about
20% (w/w) cinnamaldehyde, from about 20 to 50% potassium sorbate, ethanol, and
water.
A more preferred preservative formulation includes about 15% cinnamaldehyde,
about
40% potassium sorbate, 10% ethanol, and 35% water.
(ii)
Combinations of Erythorbic Acid or a Salt Thereof, Citric Acid or a Salt
Thereof, Glucono Delta Lactone, Benzoic Acid or a Salt Thereof, Sorbic
Acid, EDTA, or a Salt Thereof
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[51] Another preferred mixture is (a) erythorbic acid or a salt thereof
(e.g., sodium erythorbate) and (b) one or more of (i) citric acid or a salt
thereof, (ii)
glucono delta lactone, (iii) benzoic acid or a salt thereof (e.g., sodium
benzoate), (iv)
sorbic acid or a salt thereof or (v) ethylenediaminetetraacetic acid (EDTA) or
a salt
thereof
[52] Another preferred mixture is (a) benzoic acid or a salt thereof (e.g.,
sodium benzoate) and (b) one or more of (i) citric acid or a salt thereof (ii)
glucono delta
lactone, (iii) sorbic acid or a salt thereof or (iv)
ethylenediaminetetraacetic acid (EDTA)
or a salt thereof
[53] Erythorbic acid and salts thereof typically are not color stable in
formulations, such as shampoos. Surprisingly, it has been found that these
mixtures are
color stable. It has also been surprisingly found that erythorbic acid and
salts thereof and
glucono delta lactone potentiate the biocidal efficacy of citric acid, benzoic
acid, EDTA,
and salts thereof
[54] Preferred mixtures include, but are not limited to, those in the table
below. Preferred and more preferred weight ratios are also provided in the
table.
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Mixture Component (a) Component (b) Preferred More
No. Weight Ratio Preferred
Weight Ratio
1 Benzoic Acid or a Salt Erythorbic Acid or about 0.1:1 to about 0.2:1 to
Thereof a Salt Thereof about 20:1 about 5:1
2 Sorbic Acid or a Salt Erythorbic Acid or about 0.1:1 to about 0.2:1 to
Thereof a Salt Thereof about 20:1 about 5:1
3 Benzoic Acid or a Salt Glucono Delta
about 0.1:1 to about 0.2:1 to
Thereof Lactone about 20:1 about 5:1
4 Glucono Delta Lactone Erythorbic Acid or about 0.1:1 to about 0.2:1 to
a Salt Thereof about 20:1 about 5:1
Glucono Delta Lactone Benzoic Acid or a about 0.1:1 to about 0.2:1 to
Salt Thereof about 20:1 about 5:1
[55] More preferred mixtures include, but are not limited to, those shown
in the table below.
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Mixture Component (a) Component (b) Preferred More
No. Weight Ratio Preferred
Weight Ratio
1 Sodium Benzoate Sodium Erythorbate about 1:1 to about 3:1
about 5:1
2 Potassium Sorbate Sodium Erythorbate about 1:1 to about 3:1
about 5:1
3 Sodium Benzoate Glucono Delta about 1:1 to about 3:1
Lactone about 5:1
4 Glucono Delta Lactone Sodium Erythorbate about 1:1 to about 3:1
about 5:1
Glucono Delta Lactone Sodium Benzoate about 1:1 to about 3:1
about 5:1
Antimicrobial Compositions
[56] The antimicrobial compositions of the present invention are useful
as antimicrobial, fungicidal, and bactericidal agents (such as against
allergens, tree and
5 plant fungi, and plant and tree bacteria) and as preservatives in the
papermaking, textile,
agricultural, and coating industries and in personal care, household,
industrial, and
institutional products. The antimicrobial composition may be incorporated into
substrates
susceptible to microbial growth to preserve them. For example, the
preservative system
may be incorporated into or be a personal care product, such as a shampoo,
conditioner,
cream, lotion (such as body lotion), cosmetic, or soap; a household product,
such as a
fabric softener, laundry detergent, or hard surface cleaner; or an industrial
product, such as
paint, coatings, wood, textile, adhesive, sealant, leather, rope, paper, pulp,
paper board,
sheet rock, ceiling tiles, plastic, fuel, petroleum, oil, rubber working
fluid, metal working
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fluid, starches (such as pet food starch), or mineral slurry, such as a slurry
of clay, calcium
carbonate, or titanium oxide (TiO2).
[57] Generally, the product contains an antimicrobial, preservative,
bactericidal, and/or fungicidal effective amount of the antimicrobial
composition.
According to one embodiment, the product contains from about 0.01 to about
2.0% by
weight of each component of the antimicrobial composition, based upon 100%
total
weight of product. According to another embodiment, the product includes from
about 0.1
to about 1 or 2% by weight of the antimicrobial composition, based upon 100%
weight of
total product.
Cinnamaldehyde Preservative Systems
[58] Cinnamaldehyde and mixtures of (i) cinnamaldehyde and (ii) at
least one of an alkanol dialkyl hydantoin, isothiazolone, and
benzisothiazolinone
(hereinafter referred to as "the preservative system") are useful as
antimicrobial,
fungicidal, and bactericidal agents (such as against allergens, tree fungi,
and tree bacteria)
and as preservatives in the papermaking, textile, agricultural, and coating
industries and in
personal care, household, industrial, and institutional products. The
preservative system
may be incorporated into substrates susceptible to microbial growth to
preserve them. For
example, the preservative system may be incorporated into or be a personal
care product,
such as a shampoo, conditioner, cream, lotion (such as body lotion), cosmetic,
or soap; a
household product, such as a fabric softener, laundry detergent, or hard
surface cleaner; or
an industrial product, such as paint, coatings, wood, textile, adhesive,
sealant, leather,
rope, paper, pulp, paper board, sheet rock, ceiling tiles, plastic, fuel,
petroleum, oil, rubber
working fluid, metal working fluid, starches (such as pet food starch), or
mineral slurry,
such as a slurry of clay, calcium carbonate, or titanium oxide (TiO3).
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CA 02797272 2012-11-27
[59] Generally, the antimicrobial composition and preservative system of
the present invention acts quickly (e.g., reduces the microorganism (e.g.,
bacteria and/or
fungi) count by 95, 99, 99.9, or 99.99% typically within an hour) and
maintains efficacy
(e.g., maintains less than 10 cfu/g) over long periods of time (e.g., for at
least 7, 10, 14, or
28 days). The term "preservative effective amount" refers to an amount of the
preservative system which maintains the microorganism count below 1000, 100,
or 10
cfu/g for at least 1, 4, 7, 10, 14, or 28 days.
[60] The antimicrobial composition and preservative system may include
a solvent, such as water and water miscible solvents, including, but not
limited to, alcohols
(e.g., methanol, ethanol, propanol, iso-propanol, and butanol), glycols (e.g.
glycerin,
diglycerin, butylene glycol, butoxydiglycol, propylene glycol, and dipropylene
glycol),
esters, ethers, polyethers, and any combination of any of the foregoing. For
example, the
solvent may comprise water and one or more glycol and/or one or more alcohol,
such as
glycerin, phenoxyethanol, benzyl alcohol, or ethanol. A specific solvent
system comprises
water and and a glycol, such as glycerin. A second specific solvent system
comprises
water and an alcohol, such as ethanol.
[61] Other adjuvants may be included in the antimicrobial composition
and preservative system as known to one of ordinary skill in the art. Suitable
adjuvants
include, but are not limited to, preservatives; solubilizing agents; chelating
agents, such as
ethylenediaminetetraacetic acid (EDTA) and salts thereof and zeolites;
surfactants, such as
cationic, anionic, nonionic, and amphoteric surfactants; antioxidants, such as
butylated
hydroxyanisole (BHA) and butylhydroxytoluene (BHT); amine oxides; tertiary
amines;
zinc compounds; hydrotropes; fluoride compounds; magnesium salts; calcium
salts;
carboxylic acids; phosphates; phosphonates; formaldehyde donors; glycereth-7;
myristyl
myristate; glutaraldehydes; biguanides; natural products, such as geranoil,
usnic acid, and
tea tree oils; and any combination of any of the foregoing. Suitable
preservatives include,
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CA 02797272 2012-11-27
but are not limited to, quaternary ammonium chlorides; quaternary ammonium
carbonates;
benzalkonium chloride; iodine containing compounds, such as 3-iodo-2-propynyl
butyl
carbamate (IPBC); hydantoins, such as dimethylhydantoin and halogenated
hydantoins;
isothiazolinones; parabens, such as methylparaben, ethylparaben, and
propylparaben;
dehydroacetic acid and salts thereof isocil; chloroxylenol; chlorhexidine;
phenoxyethanol;
benzyl alcohol; phenethyl alcohol; benzoic acid and salts thereof such as
sodium benzoate;
chlorobutanol; sorbic acid and salts thereof triclosan; triclocarban; and any
combination
of any of the foregoing.
[62] The antimicrobial composition and preservative system may be
incorporated into an aqueous or oil based system or an emulsion. A suitable
solvent for an
oil based system is phenoxyethanol and/or benzyl alcohol.
[63] The antimicrobial composition can be a liquid or a solid.
[64] When the synergistic mixture contains only two ingredients from
the list above, the weight ratio of the first component to the second
component typically
ranges from about 0.01:100 to about 100:0.01, preferably ranges from about
0.1:20 to
about 20:0.1, and more preferably ranges from about 1:10 to about 10:1. When
the
synergistic mixture contains three components, the third component can be in
any amount,
but typically the weight ratio of the third component to either of the first
two components
is from about 0.01:100 to about 100:0.01.
[65] To prepare a formulation containing the product of the present
invention, a concentrate of the antimicrobial composition and preservative
system is
generally first prepared. The concentrate may include from about 0.01 to about
100% by
weight of the antimicrobial composition and preservative system and preferably
contains
from about 5 to about 80% by weight of the antimicrobial composition, based
upon 100%
total weight of concentrate. For a two-component antimicrobial composition,
the
concentrate broadly contains from about 0.01 to about 99.99% by weight of the
first
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CA 02797272 2012-11-27
component and from about 99.99% to about 0.01% by weight of the second
component
(based upon 1 0 0 % total weight of concentrate). When the preservatives
system is
cinnamaldehyde, the concentrate may include from about 0.01 to about 100%
cinnamaldehyde by weight and preferably contains from about 5 to about 80%
cinnamaldehyde by weight, based upon 100% total weight of concentrate. Table A
illustrates the components and the ranges of components present in a typical
concentrate
for the cinnamaldehyde/alkanol substituted dialkylhydantoin mixtures (based
upon 100%
total weight of concentrate).
Table A
Ranges Cinnamaldehyde Alkanol Substituted
Dialkylhydantoin, Isothiazolinone,
Benzisothiazolinone
Broad from about 0.01 to about 99.99% from about 99.99 to
about 0.01%
Preferred from about 5 to about 95% from about 95 to about 5%
[66] Before use, the concentrate is diluted, preferably with the same
solvent as was used in the concentrate, and/or incorporated into a product.
Use dilutions
of the composition typically comprise an antimicrobial, preservative,
fungicidally, or
bactericidally effective amount of the antimicrobial composition or
preservative system.
[67] Generally, use dilutions contain from about 0.0001% or 0.01% to
about 2% by weight of the concentrate. According to one preferred embodiment,
use
dilutions contain from about 0.1 to about 1% by weight of the concentrate. In
more
preferred embodiments, the use dilution contains 0.2, 0.25 or 0.30% by weight
of the
concentrate. The use dilution generally contains from about 0.01, to about
2.0% by weight
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CA 02797272 2012-11-27
of each antimicrobial ingredient, based upon 100% total weight of use
dilution. According
to a preferred embodiment, the antimicrobial composition contains from about
0.001 to
about 10%, preferably from about 0.01 to about 1%, and more preferably from
about 0.05
to about 0.5% by weight of each antimicrobial ingredient (e.g.,
cinnamaldehyde). When
the preservative system is cinnamaldehyde, the use dilution may contain from
about 0.001,
0.005, 0.01, 0.02, 0.03, 0.04,0.05, 0.06, 0.07, 0.08, 0.09, or 0.1% to about
1, 0.5, 0.4, 0.3,
0.25, 0.2, 0.15, 0.1, 0.09, 0.08, 0.07, 0.06, 0.05, 0.04, 0.03, 0.02, or 0.01%
by weight based
upon 100% total weight of use dilution. Table B illustrates the components and
generally
the ranges of components present in the use dilution (based upon 100% total
weight of use
dilution).
Table B
Ranges Cinnamaldehyde Alkanol Substituted
Dialkylhydantoin, Isothiazolinone,
Benzisothiazolinone
Broad from about 0.001 to about 10% from about 0.001 to about
10%
Preferred from about 0.01 to about 1% from about 0.01 to about 1%
More from about 0.05 to about 0.5% from about 0.05 to about
0.5%
Preferred
[68] According to another embodiment, the aforementioned preservative
system is incorporated into a product at a concentration of about 0.1 to about
1 or 2% by
weight, based upon 100% total weight of product.
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CA 02797272 2012-11-27
[69] Another embodiment of the present invention is a method for
inhibiting the growth of microorganisms, bacteria (e.g., S. aureus (ATCC #
6538), P.
aeruginosa (ATCC # 9027), and E. coli (ATCC # 8739)), and/or fungi (including
plant
and tree fungi) (e.g., Candida albicans, Aspergillus niger and Phytophthora
ramrum) on a
substrate by applying an antimicrobial, preservative, bactericidal, or
fungicidal effective
amount of the antimicrobial composition or preservative system of the present
invention to
the substrate. The antimicrobial composition or preservative system may be
applied to
the substrate by any method known in the art including, but not limited to,
brushing,
dipping, soaking, vacuum impregnation, and pressure treatment. A specific
embodiment is
a method for inhibiting the growth of the tree fungus Phytophthora ramrum by
applying a
fungicidal effective amount of the antimicrobial composition or preservative
system of the
present invention to the tree fungas or substrate (such as a tree) on which
the tree fungas
grows. Phytophthora ramrum causes Sudden Oak Death.
[70] The antimicrobial composition of the present invention may be
prepared by mixing the antimicrobial components, and optionally, solvents, and
adjuvants.
The mixture may be heated and/or stirred to expedite mixing.
Examples
[71] The following examples illustrate the invention without limitation.
All parts and percentages are given by weight unless otherwise indicated.
Example 1
[72] Each anionic shampoo sample in Figures 1-3 were tested as follows.
A standardized mixed bacterial solution was prepared according to the
following
procedure. 3 agar stabs of S. aureus (ATCC # 6538), P. aeruginosa (ATCC #
9027), and
E. coli (ATCC # 8739) were separately incubated at about 35 C for about 24
hours. Each
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CA 02797272 2012-11-27
,
stab was then washed with 3 mL of sterile 0.85% saline solution. The washes of
the 3
stabs were pooled together to form an organism mixture. The absorbance of the
organism
mixture at 530 nm was adjusted to about 1.00 by adding saline. The
spectrometer was
calibrated with a saline blank. A 5 mL aliquot of the organism mixture was
mixed
together to produce the standardized mixed bacterial solution. Then, 40 g of
each
shampoo sample was inoculated with 0.2 mL of the standardized mixed bacterial
solution
and mixed. 1 g of the mixture was added to a sterile 20 x 150 mm screw cap
test tube.
[73] 9 mL of sterile D/E neutralizer broth was added to the test tube and
mixed to form a 10-1 dilution. Serial dilutions were prepared through to a 10-
6 dilution with
phosphate buffered water. The serial dilutions were plated onto Tryptic Soy
Agar and
incubated for 2 days at about 35 C. Bacteria counts were performed after 21
days.
[74] The anionic protein shampoo composition was comprised of 35%
by weight of sodium lauryl ether sulfate; 25% by weight of triethanolamine
lauryl sulfate;
3% by weight coconut diethanolamide (cocamide DEA); 1% by weight of hydrolyzed
collagen, available as Polypro 5000TM from Hormel Foods of Austin, MN; and 36%
by
weight of deionized water.
[75] The antimicrobial composition containing samples were prepared
by mixing the appropriate amounts of the antimicrobial ingredients and the
aforementioned anionic protein shampoo composition and heating the mixture to
about
50 C for about 15 minutes.
[76] The results are shown in Figures 1-3.
Example 2
[77] Each anionic shampoo sample in Figures 4-7 were tested as follows.
A standard mixed bacterial solution was prepared according to the following
procedure. 2
agar slants of Candida albicans and 4 agar slants of Aspergillus niger were
separately
- 23 -
CA 02797272 2012-11-27
incubated at about 25 C for about 48 hours and 7 days, respectively. Each
slant was
washed with 3 mL of sterile 0.85% saline solution, collected and macerated in
a tissue
grinder. Sufficient amounts of 0.85% saline solution were added to each slant
to obtain a
visual count under a microscope with a Neubauer Hemocytometer of each
innoculum of
C. albicans and A. niger. Equal volumes of each standardized innoculum of C.
albicans
and A. niger were mixed together to form the standardized mixed fungal
solution.
[78] 40g of each shampoo sample was inoculated with 0.4 mL of the
standardized mixed fungal solution and mixed. lg of the mixture was added to a
sterile 20
x 150mm screw cap test tube.
[79] 9 mL of sterile D/E neutralizer broth was added to the test tube and
mixed to form a 10-1 dilution. Serial dilutions were prepared through to a 10-
6 dilution
with phosphate buffered water. The serial dilutions were plated onto Sabourand
dextrose
agar and incubated 5 days at about 25 C. Fungal counts were performed after 0,
7, and/or
14 days.
[80] The anionic protein shampoo composition is described in Example
1. The shampoo samples were prepared by mixing the appropriate amounts of the
antimicrobial ingredients and the anionic protein shampoo composition and
heating the
mixture to about 50 C for about 15 minutes.
[81] The results are shown in Figures 4-7.
Example 3
[82] The procedure described in Example 1 was repeated with the
preservative formulations set forth in Table 1 below. The pH of the shampoo
was adjusted
to 6.5. The results are also shown in Table 1.
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CA 02797272 2012-11-27
Table 1
Day 0 Day 7 Day 14 Day 28
Preservative Formulation cfu/g. cfu/g. cfu/g.
cfu/g.
0.3% w/w of a mixture containing 75%
1-3 x
potassium sorbate and 25% sodium 106 <10 <10 <10
erythorbate
0.3% w/w of a mixture containing 75%
1-3 x
sodium benzoate and 25% sodium 10 <10 <10 <10
6
erythorbate
1-3x >3x >3x >3x
0.45% w/w sodium erythorbate 106 106
106 106
1-3x lx
<10
0.45% w/w sodium benzoate 106 105 7 x 105
1-3x lx
0.45% w/w potassium sorbate 106 105 6 x 104 N.D.
1-3x >3x >3x >3x
Unpreserved Shampoo 106 106 106
106
[83] From Table 1, synergism for (1) a 0.3% dilution of potassium
sorbate (75%) and sodium erythorbate (25%) and (2) a 0.3% dilution of sodium
benzoate
(75%) and sodium erythorbate (25%) against mixed bacteria in shampoo was
calculated
by the method described in C.E. Kull et al., "Mixtures of Quaternary Ammonium
Compounds and Long-chain Fatty Acids as Antifungal Agents", Applied
Microbiology,
9:538-541 (1961). The synergism value (QA/Qa + QB/Qb) was determined. QA is
the
concentration of potassium sorbate or sodium benzoate (in percent by weight)
in the
mixture, which yielded 100% retardation of the bacteria, i.e., resulted in a
plate count of <
10 cfu/g after 7 days. Qa is the concentration of potassium sorbate or sodium
benzoate
alone (in percent by weight) required to yield 100% retardation of the
bacteria. QB is the
concentration of sodium erythorbate (in percent by weight) in the mixture,
which yielded
100% retardation of the bacteria. Qb is the concentration of sodium
erythorbate alone (in
percent by weight) required to yield 100% retardation of the bacteria.
- 25 -
CA 02797272 2012-11-27
[84] When the value of (QA/Qa + QB/Qb) is less than one, the mixture is
synergistic. Values for (QA/Qa + QB/Qb) of 1 and greater represent an additive
effect and
an antagonistic effect, respectively. The results are shown in Table 2 below.
Table 2
Preservative Mixture
QA QB Qa Qb
QA/Qa
QB/Qb
75% potassium sorbate and 0.225% 0.075% 0.45% 0.45%
0.67
25% sodium erythorbate
((1)
75% Sodium Benzoate and 0.225% 0.075% 0.45% 0.45%
0.67
25% Sodium erythorbate
Example 4
[85] Each anionic shampoo sample in Table 3 below was tested as
follows. A standardized mixed bacterial solution was prepared according to the
following
procedure. 3 agar stabs of S. aureus (ATCC # 6538), P. aeruginosa (ATCC #
9027), and
E. coli (ATCC # 8739) were separately incubated at about 35 C for about 24
hours. Each
stab was then washed with 3 mL of sterile 0.85% saline solution. The washes of
the 3
stabs were pooled together to form an organism mixture. The absorbance of the
organism
mixture at 530 nm was adjusted to about 1.00 by adding saline. The
spectrometer was
calibrated with a saline blank. A 5 mL aliquot of the organism mixture was
mixed
together to produce the standardized mixed bacterial solution. Then, 40 g of
each
shampoo sample was inoculated with 0.2 mL of the standardized mixed bacterial
solution
and mixed. 1 g of the mixture was added to a sterile 20 x 150 mm screw cap
test tube.
[86] 9 mL of sterile D/E neutralizer broth was added to the test tube and
mixed to form a 10-1 dilution, . Serial dilutions were prepared through to a
10-6 dilution
with phosphate buffered water. The serial dilutions were plated onto Tryptic
Soy Agar
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CA 02797272 2012-11-27
and incubated for 2 days at about 35 C. Bacteria counts were performed after
0, 7, and 14
days. The results are shown in Table 1.
[87] The anionic protein shampoo composition was comprised of 35%
by weight of sodium lauryl ether sulfate; 25% by weight of triethanolamine
lauryl sulfate;
3% by weight coconut diethanolamide (cocamide DEA); 1% by weight of hydrolyzed
collagen, available as Polypro 5 0 0 011\4 from Hormel Foods of Austin, MN;
and 36% by
weight of deionized water.
[88] The cinnamaldehyde and other preservative containing samples
were prepared by mixing the appropriate amounts of the preservatives and the
1 0 aforementioned anionic protein shampoo composition and heating the
mixture to about
500 C for about 15 minutes.
Table 3
Shampoo S.
aureus, P. aeruginosa, and E. coli (cfu/g)
Day 0 Day 7 Day 14
Unpreserved Anionic Protein Shampoo 3.0 x 107 3.0 x 107 3.0
x 107
Composition
0.25% Cinnamaldehyde 3.0 x 107 < 10 < 10
0.20% Cinnamaldehyde 3.0 x 107 < 10 < 10
0.10% Cinnamaldehyde 3.0 x 107 1.0 x 101 < 10
1.0% Benzyl Alcohol 3.0 x 107 5.0 x 106 5.3
x 106
1.0% LiquaParTM Optima* 3.0 x 107 3.0 x 107 2.0
x 107
1% Tea Tree Oil 3.0 x 107 3.0 x 107 3.0
x 107
1% d-Limonene 3.0 x 107 3.0 x 107 3.0
x 107
1% Gerniol 3.0 x 107 3.0 x 1 07 3.0
x 107
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CA 02797272 2012-11-27
1% Nerol 3.0 x 107 3.0 x 107 3.0 x 107
1% Citral 3.0 x 107 3.0 x 107 3.0 x 107
1% Eugenol 3.0 x 107 3.0 x 107 3.0 x 107
1% Hexahop 3.0 x 107 3.0 x 107 3.0 x 107
[89] * - LiquaParTM Optima is phenoxyethanol (and) methylparaben
(and) isopropylparaben (and) isobutylparaben (and) butylparaben and is
available from
ISP Labs of Wayne, NJ.
[90] All percentages in Table 3 are in percent by weight based upon
100% by weight of total shampoo.
Example 5
[91] Each anionic shampoo sample in Table 4 below was tested as
follows. A standard mixed bacterial solution was prepared according to the
following
procedure. 2 agar slants of Candida albicans and 4 agar slants of Aspergillus
niger were
separately incubated at about 25 C for about 48 hours and 7 days,
respectively. Each slant
was washed with 3 mL of sterile 0.85% saline solution, collected and macerated
in a tissue
grinder. Sufficient amounts of 0.85% saline solution were added to each slant
to obtain a
visual count under a microscope with a Neubauer Hemocytometer of each
innoculum of
C. albicans and A. niger. Equal volumes of each standardized innoculum of C.
albicans
and A. niger were mixed together to form the standardized mixed fungal
solution.
[92] 40g of each shampoo sample was inoculated with 0.4 mL of the
standardized mixed fungal solution and mixed. lg of the mixture was added to a
sterile 20
x 150mm screw cap test tube.
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CA 02797272 2012-11-27
[93] 9mL of sterile DIE neutralizer broth was added to the test tube and
mixed to form a 10-1 dilution. Serial dilutions were prepared through to a 10-
6 dilution
with phosphate buffered water. The serial dilutions were plated onto Sabourand
dextrose
agar and incubated 5 days at about 25 C. Fungal counts were performed after 0
and 14
days. The results are shown in Table 9.
[94] The anionic protein shampoo composition is described in Example
4. The shampoo samples were prepared by mixing the appropriate amounts of the
preservatives and the anionic protein shampoo composition and heating the
mixture to
about 50 C for about 15 minutes.
Table 4
Shampoo Fungal Plate Count (cfu/g)
Day 0 Day 7 Day 14
Unpreserved Anionic Protein 1.0 x 105 4.5 x 104
8.5 x 104
Shampoo Composition
0.20 Cinnamaldehyde 1.0 x 105 < 10 < 10
0.10% Cinnamaldehyde 1.0 x 105 3.0 x 101 < 10
0.05% Cinnamaldehyde 1.0 x 105 8.0 x 103 < 10
1.0% Benzyl Alcohol 1.0 x 105 6.0 x 103 6.0 x 104
1.0% LiquaParTM Optima 1.0 x 105 4.0 x 104 3.0 x 104
Example 6
[95] Each cream sample in Table 5 below was tested by the procedure
described in Example 1. A glyceryl monostearate (GMS) cream as described in
Table 3
below was prepared as follows. The polyoxyethylene glyceryl monostearate,
glyceryl
monostearate, cetearyl alcohol, and myristyl propionate were mixed and heated
to 60 C
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CA 02797272 2012-11-27
in a first container. The glycerin and sterile deionized water were mixed and
heated to 60
C in a second container. The solution in the first container was poured into
the second
container. The second container was maintained at 60 C for 10 minutes. The
solution in
the second container was allowed to cool. The pH of the solution was adjusted
to pH 7
with sodium hydroxide to yield the GMS cream.
Table 5
Ingredient Trade Name Chemical Name
Amount (% w/w)
Aldosperse MS-20 Polyoxyethylene (POE) glyceryl 4.00
(Lonza) monostearate
Aldo (Lonza) Glyceryl monostearate 6.00
TA 1618 (Procter & Cetearyl alcohol 1.50
Gamble)
Lonzest 143-S (Lonza) Myristyl propionate 8.00
Glycon G-100 (Lonza) Glycerin 5.00
Sterile Deionized Water 75.50
Total 100.00
[96] The cream samples shown in Table 6 below were prepared by
mixing the appropriate amounts of the preservatives and the GMS cream and
heating the
mixture to 50 C for 1 0-1 5 minutes. The results are shown in Table 6 below.
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CA 02797272 2012-11-27
Table 6
Cream S. aureus, P. aeruginosa, and E. coli (cfu/g)
Day 0 Day 7 Day
14
Unpreserved GMS Cream 3.0 x 107 3.0 x 107 3.0 x 107
0.25% Cinnamaldehyde 3.0 x 107 < 10 < 10
0.10% Cinnamaldehyde 3.0 x 107 4.0 x 104 9.3 x
105
[97] The cream samples shown in Table 7 below were prepared by
mixing the appropriate amounts of the preservatives and the GMS cream and
heating the
mixture to 50 C for 10-15 minutes. The results are shown in Table 7 below.
Table 7
Cream Fungal Plate Count (cfu/g)
Day 0 Day 7 Day
14
Unpreserved GMS Cream 1.0 x 105 2.3 x 105 1.5 x
105
0.25% Cinnamaldehyde 1.0 x 105 < 10 < 10
0.10% Cinnamaldehyde 1.0 x 105 <10 < 10
Example 7
[98] The procedure in Example 4 was repeated with the shampoo
samples shown in Table 8 below. The results are shown in Table 8.
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CA 02797272 2012-11-27
=
Table 8
Cream S. aureus, P. aeruginosa, and E. coli
(cfu/g)
Day 0 Day 7 Day 14
Unpreserved Anionic Protein 3.0 x 106 3.0 x 107 3.0 x
107
shampoo Composition
0.10% Cinnamaldehyde 3.0 x 106 1.0 x 101 < 10
0.05% Cinnamaldehyde 3.0 x 106 6.5 x 106 1.0 x
107
0.05% Glydant 2000TM * 3.0 x 106 2.0 x 102 1.0 x
102
0.02% Glydant 2000Tm and 3.0 x 106 < 10 < 10
0.025% Cinnamaldehyde
[99] * - Glydant 2000TM is a 70% solution of hydantoin species
including about 36% dimethylol dimethyl hydantoin (DMDMH), about 29%
monomethylol dimethylhydantoin (MMDMH), and about 5% dimethyl hydantoin (DMH);
and 30% water and is available from Lonza, Inc. of Fair Lawn, NJ.
[100] Synergism for the cinnamaldehyde/Glydant 2000TM solutions in
Table 8 against S. aureus, P. aeruginosa, and E. coli was calculated by the
method
described in C.E. Kull et al., "Mixtures of Quaternary Ammonium Compounds and
Long-
chain Fatty Acids as Antifungal Agents", Applied Microbiology, 9:538-541
(1961). The
synergism value (QA/Q, + QB/Qb) in Table 7 was determined. QA is the
concentration of
cinnamaldehyde (in percent by weight) in the mixture, which yielded 100%
retardation of
the bacteria, i.e., resulted in a plate count of < 10 cfu/g after 14 days. Qa
is the
concentration of cinnamaldehyde alone (in percent by weight) required to yield
100%
retardation of the bacteria. QB is the concentration of Glydant 2000TM (in
percent by
weight) in the mixture, which yielded 100% retardation of the bacteria. Qb is
the
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CA 02797272 2012-11-27
concentration of Glydant 2000TM alone (in percent by weight) required to yield
100%
retardation of the bacteria.
[101] When the value of (QA/Qa QB/Qb) is less than one, the mixture is
synergistic. Values for (QA/Qa QB/Qb) of 1 and greater than 1, represent an
additive
effect and an antagonistic effect, respectively.
[102] The results are shown in Tables 9 and 10 below.
Table 9
For Day 7
Preservative Mixture QA QB Qa Qb
QA/Qa
QB/Qb
0.05% Glydant 2000TM 0.05%
0.10% Cinnamaldehyde 0.1%
0.02% Glydant 2000TM and 0.02% 0.025% 0.65
0.025% Cinnamaldehyde
Table 10
For Day 14
Preservative Mixture QA QB Qa Qb
QA/Qa
QB/Qb
0.05% Glydant 2000TM 0.05%
0.10% Cinnamaldehyde 0.05%
0.02% Glydant 2000TM and 0.02% 0.025% 0.90
0.025% Cinnamaldehyde
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CA 02797272 2012-11-27
Example 8
[103] The Minimum Inhibitory Concentration (MIC) of the preservative
mixtures was tested. The MIC is the lowest concentration of an ingredient that
will inhibit
the growth of an organism. This study was conducted using the Hamilton Micro
Lab AT
Plus Autodilutor Liquid handling System. The programs for the auto-dilutor
were based
on Lonza's Standard Application Method SAPM# 412-01-1. The Hamilton
Autodilutor
was used to dilute the starting concentrations of the preservative combination
by 50%
using nutrient broth in 96 well micro titer plates and also to inoculate the
microorganism
in the test samples.
[104] This preservatives tested were IsocilTM (a blend of methyl
isothiazolinone and methyl-chloro¨isothiazolinone), BenzocilTM
(benzisothiazolinone) and
LonzagardTM (benzethonium chloride), all of which are available from Lonza
Inc. of Fair
Lawn, NJ, in various concentrations and combinations with cinnamaldehyde.
Controls
were also included in each test plate. Each preservative combination was
tested in
duplicate against Staphylococcus aureus (ATCC # 6538) and Escherichia coli
(ATCC #
8739).
[105] Test plates were diluted by the Hamilton Autodilutor and then
inoculated with the test organism to achieve approximately 106 colony forming
units /
gram in the test sample (cfu/g). The plates were then incubated in a 32 degree
Celsius
oven for 72 hours. Results were determined by checking for growth in the test
samples
versus the control wells on each plate (visual determination of turbidity in
the wells). The
MIC shown below in Table 11 was reported as the lowest test levels of
preservative or
preservative blend that did not show any growth.
[106] A mixture of 7.5 ppm (active) BenzocilTM and 25 ppm
cinnamaldehyde effectively inhibited growth. Also, a mixture of 0.47 ppm
(active)
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CA 02797272 2012-11-27
ISOCHTM and 6.3 ppm cinnamaldehyde effectively inhibited growth.
Table 11
Test Material MIC for S. Aureus
Cinnamaldehyde 125 ppm
IsocjlTM (Isothiazolinone) 0.585 ppm (active)
BenzocilTM (Benzoisothiazolinone) 9.375 ppm (active)
[107] Synergism values for the IsocilTm/cinnamaldehyde and
BenzocilTm/cinnamaldehyde combinations were calculated from the MIC values
reported
in Table 11 by the method described in Kull, supra, referred to above, and are
set forth in
Tables 12 and 13, below.
Table 12
Preservative Mixture QA QB Qa Qb QA/Qa
QB/Qb
0.585 ppm (active) IsocilTM 0.585
125 ppm Cinnamaldehyde 125
0.47ppm (active) IsocilTM 0.47 6.3 0.85
and 6.3 ppm
Cinnamaldehyde
Table 13
Preservative Mixture QA QB Qa Qb QA/Qa
QB/Qb
9.375 ppm (active) >9.375
BenzocilTM
125 ppm Cinnamaldehyde >125
7.5 ppm (active) BenzocilTM 7.5 25 <1.0
and 25 ppm
Cinnamaldehyde
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CA 02797272 2012-11-27
Example 9
[108] The color stability of the cinnamaldehyde/potassium sorbate
mixtures described below were tested with a Gardner color test. Hydrochloric
acid was
added to adjust the pH of the formulation to the pH specified. The results are
shown
below
Stabilizer None
Hydrochloric Acid
Temperature Initial Room 37 C Room 37 C
Temperature Temperature
Initial pH 10.60 10.60 10.60 8.96 8.96
Color 6 10-11 14-15 7-8 11-12
Water 33.9 34.2 34.1 34.0 34.4
K sorbate 41.5 42.3 42.3 44.0 43.4
Cinnamaldehyde 14.8 15.1 14.9 15.5 15.6
Final pH 9.91 9.83 9.82 8.67 8.67
* * * * *
[109] Many variations of the present invention will suggest themselves to
those skilled in the art in light of the above detailed description. Such
obvious variations
are within the full intended scope of the appended claims.
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