PRESERVATIVES: A Basics

· 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. ...