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Enzymatic treatment of rice bran to improve processing
Author(s) -
Hernandez N.,
RodriguezAlegría M. E.,
Gonzalez F.,
LopezMunguia A.
Publication year - 2000
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-000-0028-2
Subject(s) - bran , rice bran oil , extraction (chemistry) , chemistry , hexane , solvent , lipase , amylase , chromatography , triacylglycerol lipase , starch , residual oil , aqueous solution , food science , enzyme , biochemistry , organic chemistry , raw material
A modification of the process of oil extraction from rice bran is proposed, introducing one or two enzymatic reactions previous to solvent extraction. Although a total aqueous enzymatic extraction process did not result in reasonable oil extraction yields, an interesting alternative results from enzymatic reactions previous to solvent extraction or pressing. A thermal treatment of rice bran is first applied to deactivate lipase, but also to gelatinize starch previous to reaction with α‐amylase. This is followed by a saccharifying step with glucoamylase to produce glucose (28 g/100 g of rice bran treated), while the residual paste, 66.7% of the original bran, may be subjected to a proteolytic process for protein extraction or directly treated with the solvent to obtain bran oil. Finally, under the defined extraction conditions using hexane, yields of oil are 5% higher when rice bran has been previously treated with α‐amylase.