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The optimization of extraction process on hemicellulose from rice bran  

Jung, Ji-Eun (Department of Food Science and Technology, Kyuongpook National University)
Choi, Yong-Hee (Department of Food Science and Technology, Kyuongpook National University)
Publication Information
Food Science and Preservation / v.15, no.4, 2008 , pp. 532-541 More about this Journal
Abstract
A central composite design was applied to investigate the effects of the independent variables of NaOH concentration(X1) and extraction time(X2) on dependent variables such as Yield(Y1), Xyl/Ara ratio(Y2), uronic acid(Y3), $\beta$-glucan(Y4) and total sugars(Y5) of hemicelluloses separated from rice bran. The Coefficients of determination(R2) in various models ranged from 0.8626 to 0.9319. Yield increased with increased NaOH concentration and extraction time. The optimum extraction conditions were NaOH concentration at 2.45M and extraction time of 24.2 h. Predicted values at the optimized conditions were acceptable, compared with experimental values. The structural characteristics of an optimum hemicellulose extract were explored. As a result, it showed that the surfaces of hemicellulose had a highly irregular reticulated structure. And also it was both small and large molecular particle in the hemicelluloses. Their average molecular weights were in the ranges $235{\sim}240$ kDa and $8.0{\sim}9.4kDa$, respectively.
Keywords
rice bran; hemicellulose; extraction; optimization;
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