FOOD SCIENCE ›› 2017, Vol. 38 ›› Issue (24): 177-182.doi: 10.7506/spkx1002-6630-201724028

• Processing Technology • Previous Articles     Next Articles

Immobilization of β-Glucosidase onto Cellulose Particles for Application in Hydrolysis of Soybean Isoflavones

YAO Yijun, WANG Lifeng, JU Xingrong   

  1. (1. Collaborative Innovation Center for Modern Grain Circulation and Safety, College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, China; 2. School of Food Science and Technology, Jiangnan University, Wuxi 214122, China)
  • Online:2017-12-25 Published:2017-12-07

Abstract: This study was conducted to evaluate the feasibility of conversion of isoflavones in soymilk using cellulose-immobilized β-glucosidase. β-glucosidase was immobilized onto cellulose particles with a loading capacity of over 40 mg of enzyme/40 cm3 carrier. The immobilized enzyme exhibited a significant efficiency for the conversion of 4-nitrophenyl-β-D-glucuronide (p-NPG) to p-nitrophenol. The optimal temperature for the enzyme was 50 ℃ and the Michaelis constant (Km) value was determined to be (1.38 ± 0.20) mmol/L. All isoflavones in black soymilk were completely converted to deglycosylated derivatives within 30 min using 40 cm3 of the immobilized enzyme as analyzed by high-performance liquid chromatography (HPLC). Experimental evaluation of the stability showed that immobilized β-glucosidase retained 60% of its original activity after 15 times repeated use and after 15 days of storage.

Key words: β-glucosidase, immobilization, cellulose particles, black soymilk, isoflavone deglycosylation

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