Journal of South China University of Technology (Natural Science Edition) ›› 2017, Vol. 45 ›› Issue (3): 125-131.doi: 10.3969/j.issn.1000-565X.2017.03.018

• Food Science & Technology • Previous Articles     Next Articles

Effects of Pulsed Electric Field on Preparation and Structure of Starch-Zn Complex

CHEN Shan1,2,3 XIE Zheng1,2 HONG Jing2 ZENG Xin-an2 HAN Zhong2,3   

  1. 1.Center for Sugar Engineering and Technology Research,Guangxi University,Nanning 530004,Guangxi,China; 2.School of Food Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 3.Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Sefety,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2016-03-14 Revised:2016-08-02 Online:2017-03-25 Published:2017-02-02
  • Contact: 韩忠( 1981-) ，男，副研究员，主要从事食品绿色加工研究． E-mail:fezhonghan@scut.edu.cn
  • About author:陈山( 1968-) ，男，教授，博士生导师，主要从事大分子物质定向控制技术与功能研究． E-mail: chen-shan@foxmail． com
  • Supported by:
    Supported by the National Natural Science Foundation of China ( 31301559， 21376094)

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Abstract:

At various pulse electric field ( PEF) strength ( 0. 0,2. 5,5. 0,7. 5,10. 0 and 12. 5kV/cm) and pulse wave number ( 0,180,360,540,720 and 900) ,rice starch-Zn complex was prepared via the reaction of rice starch with zinc acetate ( 0. 001mol /L) ,and the Zn content in the complex was determined,finding that,under the optimal conditions for preparing rice starch-Zn complex,namely a PEF strength of 7. 5 kV/cm and a pulse wave number of 360,the zinc content of the sample increases from 468. 24 mg /kg to 738. 62 mg /kg,which means that PEF can promote the reaction of Zn with starch.Besides,the optical characteristics and structural properties of rice starch-Zn complex were investigated by means of SEM,IR,X-ray photoelectron spectrometry and XRD.The results show that zinc acetate reacts with the hydroxyl groups of glucose units on rice starch; and that,with the increase of PEF strength and pulse number,the surface of rice starch particle is damaged,the relative degree of crystallinity is decreased,the coordination reaction is promoted and the amount of rice starch-Zn complex is increased.

Key words: pulsed electric field, rice starch, starch-Zn complex, structure