【摘要】 研究了以淀粉糖(葡萄糖或麦芽糖)和油酸为原料,在固定化脂肪酶的催化下合成淀粉糖油酯的反应。通过对反应影响因素的考查,表明合成淀粉糖油酸酯的最适宜条件为:当淀粉糖:油酸为1∶1.5(物质的量比),脂肪酶Novozym435的用量为0.36 g/mol油酸,丙酮用量分别为20 mL/mol葡萄糖(10 mL/mol麦芽糖),加热回流反应分别为42 h(葡萄糖油酸酯)和72 h(麦芽糖油酸酯)时,油酸的转化率分别为93%和83%。表面张力测定显示,当葡萄糖油酸酯水溶液的浓度为7.0×10-4mol.L-1时,表面张力为32 mN.m-1;麦芽糖油酸酯水溶液浓度为5.0×10-5mol.L-1时,表面张力为31 mN.m-1。更多还原

【Abstract】 The starch sugar(Glucose or Maltose)oleate is synthesized by starch sugar and oleic acid in the presence of the Immobilized lipase.The factors on the reaction were investigated.Under such conditions as the ratio of starch sugar to oleic acid 1∶ 1.5,the amount of lipase Novozym 435 to oleic acid 0.36 g/mmol,the solvent acetone to oleic acid 10 ml/mmol at reflux reaction for 42 h(Glucose oleate)and 72 h(Maltose oleate),the conversion rate of oleic acid of 93%(Glucose Oleate)and 83%(Glucose,Maltose)were obtained.The surface tension of the aqueous solution for Glucose oleate 7.0×10-4mol· L-1 was mensurated as 32 mN·m-1 and the surface tension of the aqueous solution for Maltose oleate 5.0×10-5 mol·L-1 was mensurated as 31 mN·m-1.更多还原