Effect of extrusion treatment on the thermal stability and structure of corn starch with different emulsifiers

Qingyu Yang, Zhigang Xiao, Yan Zhao, Chunjing Liu, Yan Xu and Junkun Bai
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Qingyu Yang: College of Food Science, Northeast Agricultural University, Harbin, P.R. China
Zhigang Xiao: College of Food Science, Northeast Agricultural University, Harbin, P.R. China
Yan Zhao: College of Food Science, Northeast Agricultural University, Harbin, P.R. China
Chunjing Liu: College of Food Science, Northeast Agricultural University, Harbin, P.R. China
Yan Xu: College of Food Science, Northeast Agricultural University, Harbin, P.R. China
Junkun Bai: College of Food Science, Northeast Agricultural University, Harbin, P.R. China

Czech Journal of Food Sciences, 2015, vol. 33, issue 5, 464-473

Abstract: Corn starch was treated with raw moisture (30%), screw speed (160 rpm), extrusion temperature (30, 55, 80, 105, 130, and 155°C), and emulsifier (1.2%) to produce the starch extrudate particles in a twin screw extruder. The influence of extrusion processing and composition (starch and emulsifier content) on the viscosity, microstructure, solubility, swelling power, and thermal stability of starch extrudate particles was examined. The SEM results showed that the surface of starch extrudate particles was quite irregular and a fissure could be clearly observed. The X-ray intensities and relative crystallinity were decreased after extrusion treatment. The data highlighted that the gelatinisation temperature and solubility were increased and the gelatinisation enthalpy, viscosity, and swelling power were decreased. The emulsifiers present also influenced the thermal stability and solubility of starch extrudate particles, which were attributed to their ability to modify starch granule interactions. The thermogravimetric analysis and differential scanning calorimetry analysis indicated that the thermal stability of starch extrudate particles was improved after extrusion processing.

Keywords: crystallinity; modified starches; extrudate; complexes (search for similar items in EconPapers)
Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:33:y:2015:i:5:id:125-2015-cjfs

DOI: 10.17221/125/2015-CJFS

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