Protein Extraction from Heat-Stabilized Defatted Rice Bran. 1. Physical Processing and Enzyme Treatments
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Abstract
Physical processing with or without enzyme treatments on protein extraction from heat-stabilized defatted rice bran (HDRB) was evaluated. Freeze-thaw, sonication, high-speed blending, and high-pressure methods extracted 12%, 15%, 16%, and 11% protein, respectively. Sonication (0-100%, 750 W), followed by amylase and combined amylase and protease treatments, extracted 25.6-33.9% and 54.0-57.8% protein, respectively. Blending followed by amylase and protease treatment extracted 5.0% more protein than the nonblended enzymatic treatments. High-pressure treatments, 0-800 MPa, with water or amylase-protease combinations, extracted 10.5-11.1% or 61.8-66.6% protein, respectively. These results suggest that physical processing in combination with enzyme treatments can be effective in extracting protein from HDRB.
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