Chemical composition and toxic compounds in rapeseeds (Brassica napus L.) cultivars grown in Brazil
1991
Lajolo, F.M. | Marquez, U.M.L. | Filisetti-Cozzi, T.M.C.C. | McGregor, D.I.
The chemical composition, oil characteristics, and glucosinolate, sinapine, and phytic acid contents were studied in low glucosinolate Brassica napus varieties, experimentally grown in Brazil. Lipids (43-45%) with an erucic acid content lower than 1% and proteins (18-20%) were the main components. Dietary fiber in meals comprised 23.7-27.5%, when enzymatically determined. Mineral contents were high; dietary fiber and phytic acid can compromise their availability. Sinapine and esters were found at a mean content of 3.4%. Total aliphatic plus indolyl glucosinolates determined by GLC gave values between 26 and 43 micromole/g for air-dried, defatted seed meals, roughly similar to glucosinolate contents determined by enzymatic release and colorimetric measurement of glucose (26-37 micromole/g). Individual glucosinolate analysis showed predominance of progoitrin. The rapeseed varieties introduced in Brazil showed adequate agronomic and chemical characteristics and stir offer a promising source of oil and protein for nutritional purposes.
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