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Influence of Extrusion on the Solubility of Defatted Soybean Flour in Enzymatic Hydrolysis  

Cha, Jea-Yoon (CJ Foods R&D, CJ Corporation)
Shin, Han-Seung (Department of Food Science and Technology, Dongguk University)
Cho, Yong-Jin (Korea Food Research Institute)
Kim, Chong-Tai (Korea Food Research Institute)
Kim, Chul-Jin (Korea Food Research Institute)
Publication Information
Food Science and Biotechnology / v.16, no.4, 2007 , pp. 543-548 More about this Journal
Abstract
Low-energy processing technology, which enhances the utility of defatted soybean flour (DSF), was developed using extrusion processing. DSF was extruded at different conditions using a twin screw extruder and then, dried at $40^{\circ}C$ for 20 hr. The nitrogen solubility index (NSI), viscosity, water solubility index (WSI), and water absorption index (WAI) of DSF increased after extrusion processing. The density of DSF extrudates decreased with the decrease in water content from 53 to 33% and the increase in extrusion temperature from 110 to $160^{\circ}C$. The addition of NaOH from 1.2 to 1.8% and citric acid from 1 to 5% increased the total solubility (TS) of DSF due to the decrease of protein coiling and hydrophobic bonds formation during extrusion processing. When viscozyme was reacted first, TS, NSI, and soluble carbohydrate content of DSF hydrolysates increased about 12, 6, and 7%, respectively, compared to them reacted with protease first. The TS and NSI of DSF hydrolysates were increased about 15 and 10%, respectively, by extrusion processing at alkaline and acidic pH. Extrusion processing at alkaline and acidic pH contributed the increase of efficiency to hydrolyze DSF samples using enzyme.
Keywords
defatted soybean flour; extrusion; solubility; hydrolysis;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
Times Cited By Web Of Science : 2  (Related Records In Web of Science)
Times Cited By SCOPUS : 1
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