Extraction of Cystine from Tannery Waste Wool

Abstract

Abstract: The technique of extracting cystine from the tannery waste wool was studied. The effects of pretreatment, acid hydrolysis and decoloring on the yield of the wool cystine were studied. The optimum conditions of extracting cystine were confirmed, as follows: the waste wool pretreatment conditions are pH10, alkali solution temperature 50 ℃ and dry temperature 80 ℃; the waste wool hydrolysis conditions are hydrochloric acid concentration 32%, acid to hairs ratio 1.8:1, hydrolysis temperature 120 ℃, and hydrolysis time 8 h. The determination results indicated that the product accords with the standard.

Key words: wool, cystine, acid hydrolysis

LI Wen-Xin, WEI Jun-Fa, LIAO Jun. Extraction of Cystine from Tannery Waste Wool[J]. FOOD SCIENCE, 2007, 28(7): 260-263.

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Extraction of Cystine from Tannery Waste Wool

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