【摘要】 本文以可溶性淀粉、粳稻、籼稻、小麦、玉米、谷子、红薯等为试验材料对旋光法测定粗淀粉的主要问题进行了试验研究。获得了最佳酸解剂是醋酸氯化钙(pH=2.3、D=1.3);最佳蛋白质沉淀剂是30%硫酸锌—15%亚铁氰化钾;改水浴为恒温甘油浴加热,最佳酸解温度为117℃,酸解时间为25分钟,这为各类谷物种子粗淀粉测定值的高峰点。改进法所进行试验的测定值以ISO法测定值为对照进行数理统计分析,都证明改进法油浴加热酸解温度易掌握,过滤快,滤液清彻,测定谷物种子、薯类粗淀粉含量准确性较高,精确性好等优点,与国际标准化组织(ISO)法测得结果很相近。更多还原

【Abstract】 The main questions in the determination of rough starch by optical rotatorymethod are studied in the paper with the soluble-starch,keng-rice,hsien-rice,wheat,maize,common-millet,and sweet-potato.The results show that aceticacid calcium chloride(pH=2.3,D=1.3)is optimum acid hydrolysis agent,30%zinc sulphate-15% ferrous potash cyanic is optimum precipitating protein agent,optimum acid hydrolysis temperature and time are 117℃ and 25 minutesrespectively.Statistical analysis show that results of determination are notsignificant difference between ISO(International standadization organization)method and amended method.Compared with trational methods,the amendedmethod is high in precision and accuracy,moreover,the amended method is easyto control acid hydrolysis temperature.更多还原