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Response Surface Methodology as An Approach to Optimize the Extraction of Soluble Dietary Fiber from Chinese Gooseberry Skin

LI Jia-xing1,LIU Fei2,FAN Fang-li3,CHEN Shuang-ping2,QIN Yi2,LI Wei2 (1. Food Science Research Institute of Jishou University, Jishou 416000, China; 2. Hunan Provincial Chinese Gooseberry Industrialization Engineering Technology Research Center, Jishou 416000, China ; 3. College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China)  
The acid-catalyzed hydrolysis method was adopted to extract soluble dietary fiber from Chinese gooseberry skin residue, a by-product from juice or pulp processing. Effects of four crucial parameters (i.e., material/liquid ratio, pH adjustment of water as extraction solvent, temperature and extraction duration) on extraction yield of soluble dietary fiber were investigated by one-factor-at-a-time method. Subsequently, a central composition experimental design leading to a set of 30 experiments with different combinations of the four variables was performed to attain the maximum extraction yield of soluble dietary fiber. Under the optimized conditions as follows: material/liquid ratio (g/ml) 1:37, pH 2.5, and 80 ℃ for an extraction duration of 100 min, the yield of soluble dietary fiber was found to be 47.74%.
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