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Rapeseed meal II.—Chemical composition and biological quality of the protein
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.2740210308
Subject(s) - rapeseed , lysine , protein quality , food science , chemistry , brassica , hydrolysis , composition (language) , chemical composition , meal , amino acid , protein digestibility , biological value , biology , agronomy , biochemistry , organic chemistry , linguistics , philosophy
The chemical composition (moisture, ash, protein, amino acids, ether extract, crude fibre, Ca, P, Fe, thioglucosides, isothiocyanates and oxazolidinethiones) and biological quality (net protein utilisation, available lysine and digestibility) were investigated in 12 samples of presscake meal of rapeseed ( Brassica napus ) collected from local factories. Crude fibre and mineral contents were comparatively high. Thioglucosides and their hydrolysis products (isothiocyanates and oxazolidinethiones, which are toxic) were found in high concentrations. All samples showed a high protein content and their amino acid patterns corresponded to a good‐quality protein with a score of 80, and an adequate level of available lysine. Nevertheless, the biological quality measured as net protein utilisation and digestibility gave low values, which could be explained on the basis of the presence of the toxic factors and the high level of crude fibre, respectively.