preservation and product...
TRANSCRIPT
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Preservation and Product Protection:The Next Step Forward
Steven F. SchnittgerEstee Lauder CompaniesOctober 20th, 2015
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Today’s Presentation The need for Preservatives and Product
Protection Review the status on conventional
preservatives around the globe The use of multi-functionals and
potentiators in cosmetic formulation today Physiochemical factors which effect
preservation Packaging as a form of product protection
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Mission Statement Every cosmetic manufacturer has a dual
responsibility relative to the quality of their products: Ensure that the product, as purchased, is free from
the number and types of microorganisms that could affect product quality and consumer health
Ensure that microorganisms introduced during normal product use will not adversely affect the quality and safety of the product.
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Adherence to Two Programs
To achieve these goals, two programs have to be in place (and you cannot do one without the other): Proper Preservation and Protection of the
Marketed Product Adherence to cosmetic good manufacturing
practices and Quality Assurance – which includes an effective “Environmental Monitoring Program”
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Preservation and Product Protection To ensure stability, efficacy and quality of a
cosmetic product:
All aqueous based products need to be preserved or have some form of product protection to minimize the risk of microbial contamination and ensure product quality and stability.
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Growth of Micro-organisms
5 40 320 2,560 20,480 163,8401,310,720
10,485,760
0
2,000,000
4,000,000
6,000,000
8,000,000
10,000,000
12,000,000
0 1 2 3 4 5 6 7
Num
ber
of O
rgan
ism
s
Hours
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Why we need Preservatives!
With a Preservative Without a Preservative
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Product Protection: A Multi-faceted Approach
Protection can be delivered solely based on chemicals whose only function is preservation.
Protection can also be delivered through multifunctional ingredients whose primary attributes may be some function other than preservation, but does contribute to the preservative efficacy of the formula
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Product Protection Product protection can also come from
physiochemical properties such as pH, reduced water activity, or mfg. / fill temperatures which creates an environment which is recognized as low risk to microbial growth (ISO 29621)
These properties play a minor role in aqueous based products, but may play a major role in protecting anhydrous products.
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Product Protection The final method of protection is through the use
of packaging which could help minimize the ability of the consumer or the environment to contaminate the product.
The combination of packaging and risk assessment help to determine product risk and testing requirements.
The combined parameters of Challenge Testing, Risk Assessment, and Packaging are outlined in ISO 11930.
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Production Protection
Preservatives
Multi-functionals
Potentiators
Physiochemical Factors
PackagingPackaging
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Preservation “Preservation is the process by which a chemical or
physical agent prevents a biological deterioration of materials” *
According to EC Regulation (EC) 1223 /2009 on cosmetic products:
“A preservative is a substance which is exclusively used or mainly intended to inhibit the development of microorganisms in a cosmetic product and are listed in Annex V. “
* Block, Disinfection, Sterilization, and Preservation, 4th Edition, 1991
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Preservative Type 2007 2010 2013
Methylparaben Paraben 11609 13434 13423
Propylparaben Paraben 9329 10421 10423
Phenoxeyethanol Glycol ether 5123 8878 11641
Butylparaben Paraben 2784 5289 5114
Ethylparaben Paraben 3789 4869 5004
Methylisothiazolone Isothizolone 1409 2408 3391
MI / CMI (Kathon CG) Isothizolone 1392 2235 2774
DMDM Hydantoin F.R 1665 2035 2252
Imidazolidinyl urea F.R 2266 2007 1822
Benzyl alcohol ** Alcohol 1125 1991 3042
Diazolidinyl urea F.R 1299 1644 1662
Chlorphenesin Halogenated 441 1065 1657
Sorbic acid / K sorbate Organic acid 1259 1037/1456 1326/ 2697
Dehydroacetic acid / Na Organic acid 866 948 1954
Iodo-propynyl butyl-carbamate (IPBC)
Halogenated 429 834 972
Na Benzoate Organic acid 1153 1334 2119
Quaternium -15 F.R 531 389 252
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Preservative List
Except for Benzyl alcohol every one of these molecules only has one function – Preservation!
Except for the Organic acids everyone of these compounds is under some type of regulatory, environmental, or safety review.
Because of the restrictions on the parabens, MI /CMI, the use of Phenoxeyethanol has significantly increased.
Only the Organic acids, Phenoxeyethanol, and Benzyl Alcohol has shown significant increases in usage
* Thank you Dave Steinberg for keeping this list up to date
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Multifunctional Ingredients
Industry has moved to using ingredients Multi-functional Ingredients to help potentiate the preservative efficacy of their formulations.
When used in combination with conventional systems data shows that products preserved with these chemistries have shown to help improve preservative efficacy.
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Case Study: Optimal Eye Cream
Water, squalane, glycerin, dimer dilinoleyl dimer dilinoleate, stearic acid, glyceryl stearate, beeswax, polysorbate 60,
phytosteryl/isostearyl/cetyl/stearyl/behenyl dimer dilinoleate, pentylene glycol, peg-10 stearate, behenyl alcohol,
octyldodecyl pCA, butylene glycol, dipalmitoyl hydroxyproline, glyceryl stearate Se, tocopheryl acetate, dimethicone, arginine,
trehalose, hesperidin methyl chalcone, hydroxyethylacrylate/sodium acryloyldimethyl taurate copolymer,
pimpinella anisum (anise) fruit extract, dipeptide-2, palmitoyltetrapeptide-7, yeast extract, iris florentina root extract,
artemia extract, hericium erinaceum extract, camellia sinensisleaf extract, kjellmaniella gyrata extract, caprylyl glycol,
steareth-20, ethylhexylglycerin, aminoethanesulfinic acid, etidronic acid.
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7th Amendment In 1976 legislation 76/768/EEC was enacted in the
EU to ensure product safety. The 7th Amendment required the results of a recognized challenge test to be included in a product information package for all products marketed within the EU.
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Multifunctional Ingredients A second reason for the use of multifunctional
ingredients is the potential reduction in risk of sensitization due to the over use of conventional systems.
The combination of a multifunctional with a conventional preservative system can lower the risk of sensitization and at the same time increase preservative efficacy versus when used alone.
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Multifunctional Ingredients Many cosmetic ingredients have been recognized for
years for their multifunctional properties such as Alcohols, Essential oils, EDTA, and Surfactants but today many of these ingredients are now becoming main stream in the area of preservation.
Today I will briefly discuss 2 of those ingredients: Caprylyl glycol Ethylhexylglycerin
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Glycols Multifunctional, Potentiator, Humectant
Propylene, Butylene Glycol (3.0 – 6.0%) improves solubility reduces oil/water partitioning improves stability Used as a Preservative Potentiator
1,2 Hexanediol, Pentylene Glycol (1. 0 - 2.0%) Used an Multifunctional with Antimicrobial Properties Moisturizer Formulation stabilizer
Caprylyl Glycol (0.5 - 1.0%) Used an Multifunctional with Antimicrobial Properties Improves skin hydration
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Capryly Glycol 1,2 Octanediol Soluble in both water and cosmetic esters Has antimicrobial, moisturizing and humectancy
activities Can also be used as solubilizer or delivery system Shown to have synergy with many conventional
preservative systems Has broad spectrum activity at all pH ranges Limited fungal activity Used in combination with organic acids and other
conventional systems
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Caprylyl Glycol Synergistic activity comes from its ability to
help in penetration through the cell wall. Anti-microbial activity comes from its ability to
disrupt the cell membrane Main benefit is that it stays at the water / oil
interface where preservation is needed the most.
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Caprylyl Glycol Used in combination with many other
preservatives to help in activity: Phenoxeyethanol Kathon CG Sorbic Acid IPBC Chloroxylenol
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CAPRYLYL GLYCOLSynergy with Phenoxeyethanol
0
50,000
100,000
150,000
200,000
250,000
300,000
initial 2 days 7 days 14 days 28 days
E Coli
P Aeruginosa
S Aureus
C Albicans
A Brasiliensis
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
4,000,000
initial 2days
7days
14days
28days
Caprylyl glycol works well with many preservatives/boosters to provide quicker kill
Phenoxeyethanol
Symrise
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-1
1
3
5
7
da
y 0
0
da
y 0
2
week 1
week 2
week 3
log v
alu
es
Diol inemulsion
Diol inOil
Diol inWater
Efficacy of Caprylyl Glycol;Effect on Order of Addition
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EthylhexylglycerinMultifunctional ingredient:Active component in deodorantsHas both emollient and humectant propertiesShows strong synergy with other preservatives such as parabens, Phenoxeyethanol, and Isothizolone.
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___0.1 % Ethylhexylglycerin
___
0.9 % Phenoxyethanol
___ 0.1 % Ethylhexylglycerin / 0.9 % Phenoxyethanol
Shulke Inc.
EthylhexylglycerinImproved Efficacy of Phenoxyethanol
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___0.1 % Ethylhexylglycerin
___
0.9 % Phenoxyethanol
___ 0.1 % Ethylhexylglycerin / 0.9 % Phenoxyethanol
EthylhexylglycerinImproved Efficacy of Phenoxyethanol
Shulke Inc.
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New Preservative Systems Need to build the formulation around the
preservative system Preservative may not be compatible with
emulsion type Risk of sensitization may be higher Cost per kilo may be higherWill require more work by the chemist!
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Recap In conclusion the use of multifunctional
ingredients can help in reducing the amount of a conventional preservative in a formulation and
still guarantee efficacy and safety.
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Preservative Potentiators
Potentiation can be defined as: “The enhancement of an antimicrobial agent through the
addition of a microbiologically inactive or weakly active component that presumably increases the susceptibility of the microbial target to preservative action.” *
On their own they would not supply stand alone activity
*Russell, Disinfection, Preservation, and Sterilization, 2nd edition, 1992
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Preservative Potentiators Examples to be discussed: EDTA Butylene Glycol 1,3 Propanediol (Zemea)
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EDTA(Ethylenediamine Tetraacetic Acid) A chelator which works by binding trace metals
is which is needed for the survival of the organism Has activity against gram negative bacteria Also reported activity against fungus Helps to prevent against antimicrobial resistance
Helps in preventing discoloration, fragrance oxidation, cloudiness from metal ion impurities and product rancidity Works well in an acid pH range Na2EDTA>Na3>Na4
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Butylene Glycol Used to help stabilize emulsions Potentiates the activity of parabens and
Phenoxeyethanol Helps solubilize and maintain preservatives in the
water phase of an emulsion Has bacteriostatic activity versus bactericidal
activity Retards the loss of fragrances
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1,3 - Propanediol 1,3-Propanediol is a skin-friendly, corn derived
natural glycol with enhanced performance benefits. Has humectant, solvent, emulsifier, and preservative booster, due its anti-fungal / anti-microbial testing CTFA Challenge Test data showed that Propanediol
has antimicrobial properties that prohibit contamination during shipping and handling.
In the CTFA Challenge Test, 1,3 PDO had similar performance to PG and BG in reduction of bacteria, yeast and mold.
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A skin hydration test was conducted on 10 female volunteers aged from 46 to 65. The 5 test creams were applied on the forearms of the volunteers who had dry skin on that area. The control cream replaced the glycol with water to evaluate the relative hydration properties of the other ingredients. A Corneometer 825 PC® (Courage & Khazaka) was used to measure skin hydration immediately after each application during the test.
Skin Hydration Study
DuPont
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DuPont
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Recap
In conclusion the use of ingredients considered as a Preservative Potentiator or Booster can help
in reducing the amount of a conventional preservative in a formulation and improve overall
product safety scores.
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Physio - Chemical Factors: Impact on Preservative Effectiveness
pH of emulsion (water phase)
Temperature of Preservative Incorporation
Temperature of Manufacturing and Filling Temperature
Water Activity
Order of addition of your preservative system
Percentage of Active Ingredients in Formula
Type of Surfactant System
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• According to ISO 29621 a Low Risk Product:
“Is a product that whose composition denies microorganisms the physical and chemical requirements for growth or survival”
This hostile environment is created by:o High alcohol content o Extreme pH conditionso High glycol, glycerin, polyol levelso Deodorants and antiperspirants with high aluminum
chlorohydrin levelso Anhydrous products manufactured and filled at high
temperatures o Low water activity
Low Risk Products
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Packaging can be the 1st Line of Defense.
Prevent entry of bacteria, moisture, air, and product buildup
Applies to both storage and finished product.
Use sanitary or sterile procedures when possible!
Comply with all cGMP standards
Packaging A Major Role in Preservation
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Final Packaging Low Potential Risk - Pumps, Sprays,
ophthalmic tip tubes, tubes with one way valves.
Moderate Potential Risk – Tubes, bottles, flow through pens.
High Potential Risk – Wide orifice jars, sponge applicators
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Conclusion Product Protection is a multi-faceted approach to
ensure long term quality and stability of a cosmetic product
There has been a serious reduction in the number of acceptable preservatives that can be used globally which has lead to the increased use of multifunctional ingredients to ensure preservative efficacy.
Protective Packaging can play a major role in the overall scheme for product protection.