PREPARATION OF RAPESEED PROTEIN ISOLATES: A STUDY OF THE DISTRIBUTION OF CARBOHYDRATES IN THE PREPARATION OF RAPESEED PROTEIN ISOLATES

摘要

ABSTRACTThe distribution of carbohydrates in the preparation of rapeseed protein isolates was studied. The major proportion of the carbohydrates of rapeseed meal was found to accumulate in the meal residue and supernatants. Only a minor amount was found in the isolates. The carbohydrates in the supernatants were mainly oligosaccharides. The acidic carbohydrates as well as the RNA extracted from the rapeseed meal were completely recovered in the protein isolates. When a rapeseed protein isolate was prepared by the addition of CMC and an acid, also all added CMC was recovered in the isolate. It was suggested that protein isolates prepared from other raw materials than rapeseed also contain polyacids (e.g. RNA, phytic acid, acidic polysaccharides and acidic polyphenols) extracted from the raw material.