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Carbohydrate composition of groundnuts ( Arachis hypogea )
Author(s) -
Tharanathan Rudrapatnam N.,
Wankhede Dharmaraj B.,
Rao Madhava Rao R. Raghavendra
Publication year - 1975
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.2740260605
Subject(s) - stachyose , raffinose , xylose , chemistry , hemicellulose , food science , arabinose , hydrolysis , fructose , sucrose , carbohydrate , rhamnose , starch , polysaccharide , galactose , biochemistry , fermentation
The proximate composition of defatted edible groundnut flour, processed and unprocessed, has been determined. The flour contains about 38% total carbohydrates of which oligosaccharides account for 18%, starch 12.5%, hemicelluloses A and B 0.5 and 3.5% respectively and fibre (cellulose) 4.5%. Sucrose 13.90 and 14.55%, raffinose 0.89 and 0.92%, stachyose 1.56 and 1.60%, and verbascose 0.41 and 0.42% represent the oligosaccharide fractions (from 70% alcoholic extract) of unprocessed and processed flour, respectively. In addition the unprocessed flour also contained glucose 0.80% and fructose 0.41 % along with two unidentified spots 0.70%. Hemicellulose A consisted of glucose, arabinose, and xylose (4 : 0.5 : 0.1) whereas hemicellulose B had galacturonic acid, glucose, galactose, arabinose and xylose (1 : 4: 1 : 12 : 6). The fibre fraction on hydrolysis yielded predominantly glucose with only traces of galacturonic acid and rhamnose. The presence of verbascose and xylose in groundnuts has not been previously reported.