The release of formaldehyde upon decomposition of preservative substance in the cosmetics

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The release of formaldehyde (FA) due to imidazolidinyl urea decomposition was investigated. The release of FA was dependent on pH value and temperature. The release was markedly increased in a highly alkaline buffer compared with that in an acidic buffer. Diazolidinyl urea (DU) was decomposed to two compounds in most of the cosmetic samples tested. To test the contact sensitivity of the DU present in cosmetics, their concentrations should be evaluated.Quaternium-15(QN) and its decomposition products, including FA, play a major role in the preservative effect of cosmetics containing QN, and this effect was maintained at a virtually constant level for a long period.