[关键词]
[摘要]
采用差示扫描量热仪、热重分析仪和X-射线衍射仪研究绿豆淀粉、木薯淀粉、甘薯淀粉和马铃薯淀粉对HCl/KOH法制备的淀粉-脂肪酸包合物糊化和热分解性质、玻璃化转变温度(Tg)、结晶结构等的影响。研究表明,淀粉与脂肪酸复合后晶型变为V型。在薯类淀粉-硬脂酸包合物中,马铃薯淀粉-硬脂酸包合物的糊化温度、Tg和热分解稳定性最高,木薯淀粉-硬脂酸包合物的糊化温度、Tg和热分解稳定性最低。在薯类淀粉-油酸包合物中,木薯淀粉-油酸包合物的糊化焓值(?H)最高,热分解稳定性最小;甘薯淀粉-油酸包合物的?H最低,热分解稳定性最大。比较马铃薯淀粉和绿豆淀粉,马铃薯淀粉-硬脂酸包合物的糊化温度、热分解稳定性高于绿豆淀粉-硬脂酸包合物;马铃薯淀粉-油酸包合物的?H和Tg高于绿豆淀粉-油酸包合物。
[Key word]
[Abstract]
The effect of mung bean starch, cassava starch, sweet potato starch, and potato starch on the gelatinization properties, thermal decomposition properties, glass transition temperature (Tg), and crystal structure of starch-fatty acid inclusion complexes prepared by HCl/KOH method were studied by differential scanning calorimeter, thermogravimetric analyzer, and X-ray diffractometer. The results showed that the crystal form of the starches was transformed to V-type after complexation with fatty acids. The highest gelatinization temperature, Tg, and thermal decomposition stability were present in potato starch-stearic acid inclusion complexes, while those of cassava starch-stearic acid inclusion complexes were the lowest. Among the three kinds of root and tube starch-oleic acid inclusion complexes, the cassava starch-oleic acid inclusion complex had the highest gelatinization enthalpy (?H) and the lowest thermal decomposition stability, but the sweet potato starch-oleic acid inclusion complex had the lowest ?H and the highest thermal decomposition stability. The gelatinization temperature and thermal decomposition stability of potato starch-stearic acid inclusion complexes were higher than those of mung bean starch-stearic acid inclusion complexes, while the ?H and Tg of potato starch-oleic acid inclusion complexes were higher than those of mung bean starch-oleic acid inclusion complexes.
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[基金项目]
山东省自然科学基金项目(ZR2016CM17);山东省高等学校中青年骨干教师国际合作培养项目(SD-20130825);国家级大学生创新教育立项(CX-201510435035);青岛农业大学研究生创新计划项目(QYC201419)