复合氧化剂法合成氧化玉米淀粉

Synthesis of oxidation corn starch with composite oxidation

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。

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 Fe2＋ 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 proportion [ m （ H2O2 ） ： m （ K2S2O8 ）1 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%.