FOOD SCIENCE ›› 2010, Vol. 31 ›› Issue (16): 21-23.doi: 10.7506/spkx1002-6630-201016005

• Processing Technology • Previous Articles     Next Articles

Microwave-assisted Acid Hydrolysis of Wheat B-starch and Preparation of Caramel Pigment from the Hydrolysate

CHEN Hong-xing1,2,GU Zheng-biao1,FANG Jian2,YU Xiao-hong2,LIU Han-wen2   

  1. 1. School of Food Science and Technology, Jiangnan University, Wuxi 214122, China;
    2. Yancheng Institute of Technology, Yancheng 224051, China
  • Received:2009-12-22 Online:2010-08-25 Published:2010-12-29
  • Contact: YU Xiao-hong E-mail:yxh1127@163.com

Abstract:

Under the assistance of microwave irradiation, wheat B-starch was hydrolyzed with HCl solution, and the hydrolysate was used to prepare caramel pigment. Wheat B-starch exhibited more nearly complete hydrolysis under the assistance of microwave irradiation in comparison with routine heat treatment, with a much faster reaction rate. Some metal ions such as NaCl, KCl, FeCl3 and MgCl2 had promotional effect on the acid hydrolysis of wheat B-starch. In the presence of each of these salts in 0.05% HCl, wheat B-starch could be completely hydrolyzed in 6 to 8 minutes when microwave power of 580 W was used. A caramel pigment with a color intensity of 28947 EBC units was obtained by adding 4.0% aqueous ammonia (expressed as mass ratio of amino groups to reducing sugar content in the hydrolysate) to the wheat B-starch hydrolysate.

Key words: wheat B-starch, hydrolysis, microwave irradiation, caramel pigment

CLC Number: