FOOD SCIENCE ›› 2010, Vol. 31 ›› Issue (12): 132-136.doi: 10.7506/spkx1002-6630-201012030

• Technology Application • Previous Articles     Next Articles

Optimization of Some Conditions for Yacon Juice Processing and Its Effect of the Growth of Bifidobacterium and Escherichia coli

LU Ming-sheng1,WANG Shu-jun1,XU Xing-quan2,FANG Yao-wei1,LIU Shu1   

  1. 1. School of Food Engineering, Huaihai Institute of Technology, Lianyungang 222005, China;
    2. Agriculture Science Academy of Lianyungang, Lianyungang 222006, China
  • Received:2009-02-18 Revised:2010-03-26 Online:2010-06-15 Published:2010-12-29
  • Contact: LU Ming-sheng1 E-mail:mingshenglu@hotmail.com

Abstract:

A process comprising the steps of selection, cleaning, cutting, blanching, breaking, cellulase hydrolysis, squeezing, pectinase hydrolysis and sterilization was designed for yacon juice processing. The optimum blanching temperature and length of blanching time were 100 ℃ and 2.5 min, respectively. According to the orthogonal array optimization, an optimum juice percentage of yacon was achieved by the hydrolysis at 50 ℃ and pH 5 for 45 min with added cellulase at 0.08%. The optimum pectinase amount for improved clarity of yacon juice was 0.14%. Yacon juice obviously promoted the growth of Bifidobacterium, resulted in 53% increase of Bifidobacterium biomass at 10% addition level, but had an inhibitory effect on the growth of Escherichia coli.

Key words: yacon juice, blanching, emzymatic hydrolysis, Bifidobacterium, Escherichia coli

CLC Number: