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PRESERVATIVES: A Basics

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·          Definition: A substance which is added to a preparation to prevent bacterial growth and subsequent spoilage of the preparation. ·          Preservative describes those antimicrobial agents used to protect pharmaceutical preparations. ·          Microbes are growth in non-sterile formulation lead to chemical changes in formulation and spoilage of product hence preservatives are required. ·          Examples: ethanol, alcohol, chlorhexidine, benzoic acid, methyl parabens, ethyl parabens. ·          Antimicrobial preservatives: o    Emulsions contain water, which will support microbial growth. o    Microbes produce unpleasant odours, colour changes and gases and may affect the emulsifying agent, possibly causing breakdown of the emulsion. ...

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