FOOD SCIENCE ›› 2010, Vol. 31 ›› Issue (13): 105-109.doi: 10.7506/spkx1002-6630-201013025

• Basic Research • Previous Articles     Next Articles

Decolorization of Soybean Oligosaccharides from Waste Sweet Slurry in Soybean Sheet Production

WANG Qiu-shuang1 YING Tie-jin2 CHEN Dong1 ZHAO Chao-yi1 LING Cai-jin1 SUN Shi-li1 JIANG Tian-jia2 YANG Dong-mei3 FU Mao-run4   

  1. 1. Tea Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
    2. Department of Food Science and Nutrition, Zhejiang University, Hangzhou 310029, China
    3. College of Food Science and Engineering, Gansu Agricultural University, Lanzhou 730070, China
    4. Shandong Analysis and Test Center, Shandong Academy of Sciences, Jinan 250014, China
  • Received:2009-12-03 Online:2010-07-01 Published:2010-12-29
  • Contact: WANG Qiu-shuang E-mail:wqsh1113@163.com

Abstract:

Soybean oligosaccharides extracted from waste sweet slurry in soybean sheet production had dark color and failed to meet the quality standards for soybean oligosaccharides. The characteristics of static adsorption and desorption of 10 types of resins to impurity pigments in soybean oligosaccharides solution were investigated and the resin with better decolorization efficiency was screened. Meanwhile, adsorption curve and adsorption isotherm model were also established. Results indicated that macroporous absorption resins, DM-130 and AB-8, had the best decolorization efficiency, reaching more than 70%. In addition, they could be both regenerated easily. Moreover, 50% ethanol aqueous solution could almost desorb all of the pigments absorbed. The adsorption of pigments onto DM-130 was monomolecular adsorption, which complied with Langmuir isotherm model. Therefore, the loss of soybean oligosaccharides in the adsorption onto DM-130 or AB-8was less, which provides a promising practical application value.

Key words: sweet slurry, oligosaccharides, resin, decolorization

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