干热处理对玉米淀粉性质的影响

Effect of dry heating on properties of corn starch

摘要: 研究了干热处理前后玉米淀粉的性质变化,对干热处理前后淀粉的溶解指数、糊化特性、热力学性质、颗粒形貌和结晶结构进行了测定及分析。结果表明,当干热处理温度低于150℃时,与原淀粉相比,干热淀粉的溶解指数、黏度均降低,糊化温度降低;当干热处理温度为150℃时,淀粉的溶解指数升高、黏度降低、糊化温度降低。干热处理后,淀粉表面出现凹坑,且颗粒间有黏结。

Abstract: Properties of corn starch treated before and after dry heating were studied in this paper,and effects of the dry heating on solubility,pasting properties,thermal characteristics,microstructure and crystal structure were examined. The results showed that when the treatment temperature was lower than 150 ℃,compared with native starch,the solubility,pasting temperature and paste viscosity of modified starch decreased. When the treatment temperature was 150 ℃,modified starch had lower solubility,pasting properties. After dry heating treatment,the granules of modified starch bonded and there were some holes on its surface.