干热处理辅助酶法制备多孔淀粉及其对淀粉微观结构和理化性质的影响

Effect of Combination of Dry Heat Treatment and Enzymes Hydrolysis on the Structure and Physicochemical Properties of Porous Starch

为了探讨干热处理对酶解制得多孔淀粉颗粒结构和理化性质的影响,采用扫描电子显微镜、傅里叶变换红外光谱仪、X射线衍射仪、比表面及空隙度测试仪、热重分析仪等对不同处理的淀粉进行测定,分析比较了干热处理(Dry heat treatment,DHT)对天然淀粉及多孔淀粉的影响。结果表明,经DHT的淀粉表面出现破损,相对结晶度减小;而经DHT制得的多孔淀粉颗粒表面孔洞数量增多,淀粉结晶度提高,耐热性增强;DHT提高了多孔淀粉的比表面积和总孔容,分别从1.16 m^(2)/g和21.22×10^(-3)cm^(3)/g增大至3.14 m^(2)/g和31.41×10^(-3)cm^(3)/g,使得吸附能力增强。研究结果表明干热处理结合酶解可以改善多孔淀粉的性能。

To investigate the effects of the combination of dry heat treatment(DHT)and enzymatic hydrolysis on the microstructure and physicochemical properties of porous corn starch,starch with different modification were explored by scanning electron microscopy,X-ray diffraction,infrared spectrometry,surface area&pore size analyzer and thermogravimetric analysis.The results indicated that the surface of DHT starch is damaged,and the relative crystallinity was reduced.the DHT pore starch showed more pores in the surface,and exhibited higher relative crystallinity and heat resistance when compared with the single-modified pore starch samples.HT increased the specific surface area and total pore volume of porous starch,from 1.16 m^(2)/g and 21.22×10^(-3)cm^(3)/g to 3.14 m^(2)/g and 31.41×10^(-3)cm^(3)/g,respectively.Also,the adsorption capacity of DHT pore stachwas enhanced.The results showed that dry heat treatment combined with enzymolysis was amount to an attractive alternative for improving porous starch.