【作者】 谢莹； 李蒙娜； 章宝； 陈寒青；

【Author】 Xie Ying;Li Mengna;Zhang Bao;Chen Hanqing;School of Food and Biological Engineering,Hefei University of Technology;

【机构】 合肥工业大学食品与生物工程学院；

【摘要】 本文旨在探讨重复湿热处理2次(2-HMT)结合复合酶水解对多孔小麦淀粉结构和理化性质的影响。扫描电子显微镜(SEM)结果显示,与单一改性相比,双重改性导致天然小麦淀粉表面形成更多的孔。FT-IR和XRD结果表明,双重改性处理不改变小麦淀粉的化学结构和晶体类型,而其长程和短程有序性增加。DSC结果表明,经双重改性的多孔淀粉样品具有较高的糊化温度和较低的糊化焓。吸附实验结果表明,经双重改性的多孔淀粉样品对水、葵花籽油和亚甲基蓝具有较高的吸附能力。此外,多孔A-型淀粉颗粒和2-HMT多孔A-型淀粉颗粒的吸附行为均符合Freundlich等温线模型。低温氮吸附结果表明,双重改性大大增加了淀粉样品的比表面积和总孔体积。本文研究表明,在复合酶水解前用HMT预处理2次是提高复合酶与淀粉反应效率的有效方法,且可以提高多孔小麦淀粉的吸附性能。更多还原

【Abstract】 This study was conducted to explore the effects of the combination of repeated heat-moisture treatment for two times(2-HMT) and compound enzymatic hydrolysis on the structural and physicochemical properties of porous wheat starches.The dual modifications resulted in the formation of more pores on the surface of native wheat starches compared to single modification,as revealed by SEM.XRD and FT-IR results showed that the dual modifications treatment did not alter the chemical structure and crystal type of starch,while increased the long-and short-range molecular order of starch.DSC results demonstrated that the dual modified porous starch sample exhibited higher gelatinization temperature and lower gelatinization enthalpy.Batch adsorption experiment results manifested that the dual modified porous starch samples exhibited higher adsorption capacities for water,sunflower seed oil and methylene blue.Moreover,the adsorption behaviors of the porous A-type starch granules with or without 2-HMT fitted Freundlich isotherm model well.Low-temperature nitrogen adsorption results indicated that dual modifications greatly increased specific surface area and total pore volume of the starch samples.The present study shows that pre-treatment with RHMT for two times prior to compound enzymatic hydrolysis is an effective way to increase the reaction efficiency of compound enzymes with starch and can improve the adsorption properties of porous wheat starches.更多还原