拟均相两段工艺氧化法制备双醛淀粉

以绿豆淀粉为原料，NaIO4为氧化剂的拟均相两段工艺制备双醛淀粉(dialdehyde starch，DAS)，考察预处理阶段中温度、酶处理、超声活化和氧化阶段中反应温度、反应时间、pH值、投料比、NaIO4浓度、淀粉乳浓度、相转移催化剂对制备双醛淀粉的影响，前段的预处理采用超声活化处理，后段的氧化工艺考察相转移催化剂的影响，并用正交法对制备双醛淀粉的工艺进行优化。结果表明：在以醛基含量为考察指标，预处理时不宜用酶，处理温度50～60℃，经30℃、40W、40kHz超声活化淀粉乳30min能有效提高淀粉与NaIO4的氧化反应活性，制得高醛基含量的DAS。相转移催化剂对提高产品醛基含量有一定作用。经正交试验优化得到的最佳条件为：以十六烷基三甲基氯化铵为相转移催化剂、反应时间2h、反应温度40℃、n(NaIO4):n(淀粉)=1.0:1.0、NaIO4浓度0.5mol/L、淀粉乳质量分数10%、体系pH2，在此条件下，制得的DAS双醛含量为96.81%。经光谱和理化性能等指标的检测证实所得的DAS与文献报道的DAS相符合。

Preparation of Dialdehyde Starch by Homogeneous Oxidation

The preparation of dialdehyde starch (DAS) from mung bean starch was achieved by homogeneous sodium periodate oxidation. The effects of pre-treatment temperature,enzymatic treatment,ultrasonic activation in the pre-treatment stage and reaction temperature,reaction time,pH,sodium periodate/starch ratio and phase transfer catalysts in the oxidation stage on the preparation of dialdehyde were investigated. Ultrasonic activation and phase transfer catalysis were first studied in this study. Orthogonal test was ...