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Tuesday, August 30, 2011

Cosmetic Quality Assurance: #2 Use Preservatives


To prevent bacterial contamination and stabilize a cosmetic product, use preservatives. There are two kinds of preservative:  natural and synthetic.  Both inhibit the growth of microorganisms (bacteria and/or fungi included).   Natural preservatives are less effective than synthetic because they are usually active only against gram-positive bacteria (except grapefruit seed extract).

Here are some of synthetic preservatives used in the cosmetic industry:

Diazolidinyl urea

Potassium Sorbate

Sorbic Acid

There are more synthetic preservatives in the market. Carefully choose preservatives with no or few adverse reaction.

Other synthetic preservatives are:

Parabens:  Ethyl-, Butylparaben
Urea-Derivatives: Imidazolidinyl Urea
Isothiazolones:  Methylchloro-, Methyl-Isothiazolinone
Halogen-Organic Actives:  Iodopropynyl Butylcarbamate, Methyldibromo Glutaronitrile
Organic Acids & Others:  Sodium Benzoate, Chloracetamide, EDTA, Phenoxyethanol, Triclosan, DMDM-Hydantoin, Quaternium-15
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