【摘要】 本实验首先采用正交设计法优化芭蕉芋淀粉的提取工艺,并进行了实验验证,确定其最佳工艺为:料液比为1:2,静止时间为2h,洗涤次数为4次。然后采用热碱法和正丁醇-异戊醇结晶法制备得到了芭蕉芋直链淀粉的纯品,并对其从三个方面加以评定,得知碘-直链淀粉的最大紫外吸收波长为600nm、直链淀粉含量为87.19%、碘结合量为10.4。最后以制取得到的芭蕉芋直链淀粉和玉米支链淀粉为标准物制定标准曲线,测定得到了芭蕉芋淀粉中直链淀粉的含量为77.94%。这将对芭蕉芋淀粉的分子基础研究具有一定的意义。更多还原

【Abstract】 The optimized method for extraction and purification of Canna edulis Ker. starch was determined by orthogonal design and then validated by the experiment, and the maximum content of the starch was obtained when ratio of sample and liquid was 1:2, along with 2 hours of rest time and four times of washing. Then, the amylose of Canna edulis Ker. was extracted with the method of hot alkaline, and purified through n-butanol and isoamyl alcohol crystallization again and again. At last, absorption spectrum of iodin-amylose compound was scanned from 500 to 800 nm using UV spectrometer. The amylose content was determined by the method of hot alkaline and Fehling Reagent and iodine combined content of the amylose was determined by electrometric titration. The result showed that maximum absorption spectrum of the iodin-amylose compound locates at 600 nm and the values of content and Iodine combined content of the amylose obtained are 87.14% and 10.4, respectively. In addition, the content of amylose in the Canna edulis Ker. starch is further determined as 77.94% through standard curve using the obtained amylose starch and amylopectin starch of corn as standards. This study can make a contribution to basic study of Canna edulis Ker. starch at molecular level.更多还原