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Yield and Nutritive Value of Rapeseed Protein Concentrate
Presented at the 41st Annual Meeting of the Institute of Food Technologists, Atlanta, GA. June 7–10. 1981.
Supported by Contract No. 59-2481-0-2-001-0 from the United States Department of Agriculture, Science and Education Administration, Washington, DC.
Reference to a company and/or product is only for purposes of information and does not imply approval or recommendation of the product to the exclusion of others which may also be suitable.
Appreciation is expressed to the Michigan Bean Shippers Association for the donation of navy beans.
ABSTRACT
Rapeseed protein concentrate (RC) was prepared on a semi-pilot scale by a process involving 2% sodium hexametaphosphate. The nitrogen and total solids yields were 53 and 31%, respectively. The RC contained 77% protein, negligible amounts of glucosinolates, 14.2% ash, 3.4% phosphorous, and 1.26% phytic acid. The amino acid composition was similar to rapeseed flour. When fed to rats in diets at 5 and 10% protein levels, RC exhibited higher protein quality than the casein controls and no gross abnormalities were observed in all major organs. At the 20% dietary protein level, the difference in quality was not significant and rats fed RC had larger kidneys than those fed casein. This was attributed partly to the high phosphorous content of the diet. Mineral bioavailability was not affected by the phytic acid and phosphorous present in the RC.