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Int J Cosmet Sci. 1981 Apr;3(2):57-68. doi: 10.1111/j.1467-2494.1981.tb00268.x.

The inhibitory effect of some amphoteric surfactants on the irritation potential of alkylsulphates.

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Instituto de Tecnología Química y Textil (C.S.I.C.), Barcelona, Spain.


Synopsis The physico-chemical and biological properties of an amphoteric/anionic system and its behaviour against a proteinic support have been thoroughly investigated. A considerable inhibition of adsorption of SLS (sodium lauryl sulphate) on human callus caused by the presence of definite amounts of AABet (alkyl-amido-betaines) in the treatment bath is observed. These physico-chemical results are in agreement with those obtained by some in vivo biological tests. A mechanism of the process via the formation of mixed micelles is postulated emphasizing the stability of such systems as a function of pH, the influence of the chain length of the amphoteric surfactant and the molar relative ratio SLS/AABet. Consequently, our work offers the possibility of a wide applicability of the synergic mixtures of both types of surfactants to inhibit considerably skin irritation of cosmetic finished products.

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