复合氧化剂法合成氧化玉米淀粉

以玉米淀粉为原料,过氧化氢和过硫酸钾为复合氧化剂,Fe~(2+)为催化剂,在酸性条件下以湿法工艺合成氧化玉米淀粉。以淀粉质量分数、复合氧化剂比例、复合氧化剂质量分数(占干淀粉总量)、催化剂质量分数(占干淀粉总量)、反应温度、反应时间等因素为变量,以羧基含量作为氧化度衡量指标,采用单因素试验和正交优化试验,确定制备氧化玉米淀粉最佳工艺条件为:淀粉质量分数35%、复合氧化剂质量分数8%、复合氧化剂比例m(H_2O_2):m(K_2S_2O_8)]为4:1、体系pH 4.00、催化剂质量分数0.3%、反应温度50℃、反应时间1.5 h,在此条件下,可合成氧化度为0.118%氧化玉米淀粉。

Synthesis of oxidation corn starch with composite oxidation

Corn starch was used as material in acid conditions to prepare oxidized starch by wet technology where hydrogen peroxide and potassium sulfate was used as oxidant and Fe~(2+) as catalyst. To starch milk concentration,composite oxidant proportion,composite oxidant mass fraction(the percentage of the dry starch ),catalyst mass fraction(the percentage of the dry starch ),reaction temperature,reaction time factors as a variable,with the content of carboxyl as oxidation of starch for measure oxidation degree,the optimum process conditions of oxidation starch were determined by the single factor experiments starch and the orthogonal experiment as follows:the starch milk concentration was 35%,composite oxidant mass fraction was 8%,composite oxidant proportionm(H_2O_2 ):m (K_2S_2O_8)]was 4:1,the system pH value was 4.00,catalyst mass fraction was 0.3%,the reaction temperature was 50℃,the reaction time was 1.5 h.Under above conditions,oxygenation corn starch could be obtained with oxidation degree of 0.118%.