光促催化拟均相低温氧化法制备双醛淀粉  

Preparation of Dialdehyde Starch by UV-Photocatalytic Oxidating Homogeneous at Low Temperature

作　　者：刘晓庚[1,2,3] 袁磊[1,2] 王立峰[1,2,3] 曹祟江[1,2,3] 杜迎吉 夏凤池 王雪瑶[1] 鞠兴荣[1,2,3] 邰佳[1,2] 

机构地区：[1]南京财经大学食品科学与工程学院,南京210046 [2]江苏省粮油品质控制及深加工技术重点实验室,南京210046 [3]粮食储运国家工程实验室,南京210046

出　　处：《中国粮油学报》2014年第7期33-39,共7页Journal of the Chinese Cereals and Oils Association

基　　金：国家科技支撑计划(2012BAD37B08);江苏省高等学校大学生实践创新训练计划(SJ201329)

摘　　要：以马铃薯淀粉为原料，NaIO4为氧化剂，用紫外光照催化拟均相制备双醛淀粉。通过单因素和正交试验优化得到最佳氧化条件为：反应温度为40℃，pH为3，反应时间为2．5h，高碘酸钠浓度为0．5mol／L。此时产品的醛基质量分数可达97．68％、产率为85．65％；经红外光谱、紫外可见光谱、偏光显微、色度和理化等的测定，结果表明所制备产物为双醛淀粉，且品质质量与市售品或文献值相符。用紫外光照射对拟均相低温氧化法制备DAS有明显促进作用，且波长短、功率高和效果好。在活化阶段对淀粉的活化有提高作用，且有紫外光活化使DAS产率从无光照的71．82％增加至82．01％，醛基质量分数从80．78％提高到92．87％，且光照活化效果顺序是254nm〉365nm〉无光照；在氧化反应阶段紫外光照对NaIO4氧化淀粉成DAS有促催化作用，紫外光照产率提高了5．66％～8．85％，醛基含量提高了2．53％～8．68％，而光照催化氧化效果顺序是254nm／25W〉254nm／15W〉365nm／25W〉365nm／15W〉无光照。The dialdehyde starch （DAS）, NaIO4 as the oxidant, has been prepared to produce dialdehyde starch with potato starch in Virtual Homogeneous Phase system under UV irradiation. The optimum conditions were obtained by single factor test and orthogonal test ： time 2.5 h ; temperature 40 ℃ ; pH 3 ; the concentration of NaIO4 0.5 mol/L. The mass ratio of dialdehyde of the product was 97.68%, along with the yield of 85.65% on the optimum conditions. The results of IR and UV- VIS spectroscopy experiments, polarized light microscopy experiments, colorimetric experiments, physical and chemical experiments showed that the product was DAS with good quality; UV irradiation was beneficial for preparation of dialdehyde starch by the measurement; the result was better with lower wavelength but higher power. In activation stage, UV irradiation, which could improve the activation of starch, compared to the results in the absence of lights, increased the yield of DAS from 71.82% to 82.01% and the mass ratio of dialdehyde from 80.78% to 92.87%. The sequence of effects of light activation was： 254 nm 〉 365 nm 〉 no lights. In oxidation reaction stage, UV irradiation, which could promote the DAS generation, increased the yield of DAS about 5.66% to 8.85% and the content of dialdehyde about 2.53% to 8.68%. The sequence of effects of light oxidation catalyst was ： 254 nm/25 W 〉 254 nm/15 W 〉 365 nm/25 W 〉 365 nm/15 W 〉 no lights.

关 键 词：马铃薯淀粉 双醛淀粉 拟均相 光促催化 氧化正交试验 

分 类 号：TQ432.2[化学工程]