AbstractFormulas are derived for the sulfur concentration in the insoluble remainder and extract of a keratinlike material following either chain scission, crosslink cleavage, or both. If only chain breakage occurs, the sulfur in the insoluble fraction can approach double its original concentration. On crosslink cleavage, however, it is likely to decrease somewhat by loss as unbound sulfur, formation of lanthionine, or disulfide–sulfhydryl exchang
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