A BIOLOGICAL STUDY OF Pseudomonad CONTAMINANT IN SHAMPOO AND ITS CHEMICAL PRESERVATION

概要

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It has been confirmed that Pseudomonas is dominant contaminant in commercial shampoo and shows an important role in initial product spoilage due to microbial activity. And then, bactericidal activity of several preservatives used in cosmetics has been tested in model shampoo using practical aging test.1) Sixty two per cent of isolated bacteria from commercial shampoos were identified as Pseudomonas species. The rest was unidentified gram-negative rods (21%) and gram-positive rods (17%), 2) Many of the Pseudomonas strains from shampoo could assimilate sodium lauryl sulphate as sulphur source and some of them could produce alkylsulphatase.3) In bactericidal activity of preservatives tested for isolated bacteria, Vancide 89 and nitrofran derivative showed pretty effect but carbanilide, bisphenol, salcylanilide and benzoate derivative showed less effect.4) Contamination by alkylsulphatase positive Pseudomonas into commercial shampoo contained alkylsulphate is an inherent problem. It is essential for us to take the practical aging test in using alkylsulphatase positive strain of Pseudomonas in order the effective bactericidal preservative may be selective.
日本化粧品技術者会の論文