二氧化氯的催化法制备及其对冬枣的保鲜效果

[目的]为冬枣保鲜提供科学依据。[方法]研究了以氯酸钠和硫酸为原料,尿素为还原剂,MnO2/Cr2O3为催化剂制备二氧化氯的方法。并用该方法制备了低温型缓释二氧化氯制剂1、2号,比较了其对低温贮藏冬枣的保鲜效果。[结果]经正交试验优化后,制备二氧化氯的最佳工艺为：温度70℃,酸度6mol/L,m（MnO2）∶m（Cr2O3）=3∶1,n（NaClO3）：n（CO（NH2）2）=2.5∶1,此条件下,二氧化氯产率达95%,纯度达95%以上。放置缓释二氧化氯制剂后,冬枣的可滴定酸和Vc含量均高于对照组,失重率、呼吸强度和乙醇含量均低于对照组。二氧化氯释放量大的1号缓释剂的保鲜效果好于释放量小的2号缓释剂。[结论]缓释二氧化氯制剂可有效提高冬枣的保鲜效果。

Preparation of Chlorine Dioxide by Catalytic Method and Its Preservation Effect on Winter Jujube

[Objective]The purpose of the research was to supply scientific basis for preservation of winter jujube. [Method]The preparation method of chlorine dioxide with sodium chlorate and sulfuric acid as raw materials,urea as reducer and MnO2/Cr2O3 as catalyst was researched. And the low-temperature and slow-release chlorine dioxide preparations 1 and 2 were prepared by using this method and their preservation effects on winter jujube stored at low temperature were compared. [Result]After optimization by orthogon...