Action of Ammonium and Sodium Hydroxides on Keratin Fibres in Relation to their Morphological Structure

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Abstract
The action of sodium and ammonium hydroxides on the morphological structure of three keratin fibres (Merino wool, mohair wool, and dog's hair) has been compared. The formation of lanthionine, lysinoalanine and β‐aminoalanine on the three keratin fibres has been followed, and new evidence for the formation of dehydroalanine residues as intermediates is presented. The amounts of lanthionine, lysinoalanine and β‐aminoalanine formed, their relative ratios and the fractionation of the fibres into α, β‐ and γ‐keratoses show that Merino wool (ortho and para structure) shows intermediate behaviour between mohair (ortho) and dog's hair (para). In mohair, sodium hydroxide as well as ammonium hydroxide act preferentially on the proteins isolated as α‐keratose.

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