【摘要】 以木薯淀粉为原料,研究了常压下颗粒状冷水可溶淀粉的制备方法和性质特征。试验表明,醇解法所得的颗粒状冷水可溶淀粉的溶解度可以达到98.1%。反应的最佳条件为相对加入碱量为28mL,乙醇浓度为80%,淀粉乳浓度为14%,反应温度为35℃,反应时间为50m in,对应的最佳颗粒冷水可溶木薯淀粉的冷水溶解度为95.3%(60 g木薯淀粉)。经醇解法处理后所得到的不同冷水溶解度的颗粒状冷水可溶淀粉样品,颗粒保持完整,但其表面不再光滑,呈现出凹陷、空隙和裂缝等特征;随着冷水溶解度的提高,淀粉样品的偏光十字呈现逐渐减少的趋势,且结晶性逐渐降低直至完全消失。更多还原

【Abstract】 This paper presents the preparation and properties of granular cold-water-soluble tapioca starch.Experiments indicate that the GCWS starch prepared by alcoholic-alkaline treatment can be 98.1% dissolved in the cold water.The optimum reaction conditions are : the amount of alkaline 28ml,the concentration of alcohol 80%,the concentration of starch solution 14%,the reaction temperature 35℃,the reaction time 50 min.The cold water solubility of the GCWS tapioca starch under the optimum conditions is 95.3%(for 60g tapioca starch).The GCWS tapioca starch samples remain the granule,but there are dimples and indentation on its surface.With the increasing cold water solubility,the typical Maltese-cross birefringence pattern of the samples and the degree of crystallization decrease.更多还原