Väävel (S) on organismile eelkõige vajalik valkude ainevahetuses, kuna see kuulub kolme aminohappe koostisse. Väävlit omastatakse toiduvalkudest, mis sisaldavad metioniini, tsüsteiini ja tsüstiini.
Cystine and cysteine are both determined as cysteic acid in hydrolysates of oxidised sample, but calculated as cystine (C6H12N2O4S2, M 240,30 g/mol) by using M 120,15 g/mol (= 0,5 x 240,30 g/mol).
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