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Rapeseed meal III.—A simple method for detoxification
Author(s) -
Ballester Digna,
Rodrigo R.,
Nakouzi J.,
Chichester C. O.,
Yáñez E.,
Mönckeberg F.
Publication year - 1970
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740210309
Subject(s) - steaming , rapeseed , toxicity , extraction (chemistry) , meal , detoxification (alternative medicine) , chemistry , food science , brassica , water extraction , animal feed , zoology , biology , toxicology , agronomy , chromatography , medicine , alternative medicine , organic chemistry , pathology
Two types of treatments of presscake meal of rapeseed ( Brassica napus ), steaming and water extraction, were tested to remove the thioglucosides responsible for its toxicity. The efficiency of each was judged by the residual concentration of isothiocyanates and oxazolidinethiones and the biological quality, available lysine, net protein utilisation and digestibility in rats. Double water extraction gave the best results. It resulted in a reduction of 84 % in oxazolidinethiones, the factor directly responsible for toxicity, and 77 % in isothiocyanates. Net protein utilisation increased to levels corresponding to those of animal proteins, from 40 to 69 %. The improvement in digestibility was reflected in the growth of rats. Steaming and simple water extraction, however, reduced toxicity only slightly and improved biological quality very little. The greatest change of the gross chemical composition in treated samples was observed in crude fibre, which appeared to increase.