基于旋光度法测定蔗糖水解速率常数研究  

Determination of sucrose hydrolysis rate constant based on optical rotation method

作　　者：周视玉 黄家坤 刘佳慧 章平平 陈珍 丁宗庆 ZHOU Shiyu;HUANG Jiakun;LIU Jiahui;ZHANG Pingping;CHEN Zhen(College of Chemistry and Environmental Engineering,Hanjiang Normal University,Shiyan 442000,China;Shiyan Key Laboratory of Biological Resources and Ecological Environment Protection,Shiyan 442000,China)

机构地区：[1]汉江师范学院化学与环境工程学院,湖北十堰442000 [2]生物资源与生态环境保护十堰市重点实验室,湖北十堰442000

出　　处：《延边大学学报(自然科学版)》2024年第4期59-62,共4页Journal of Yanbian University(Natural Science Edition)

基　　金：汉江师范学院校基金项目(XJ2022012);国家级大学生创新创业训练计划项目(202410518009)。

摘　　要：为探究蔗糖水解反应的动力学特点,采用旋光度法检测蔗糖水解过程中旋光度的变化,并探讨了不同酸催化剂及其浓度、温度对蔗糖水解反应速率常数的影响.实验结果表明:不同酸对蔗糖水解的催化效果不同.其中,硫酸和硝酸的催化活性明显高于醋酸,且更高的酸浓度对应于更大的反应速率常数.同时,研究利用阿伦尼乌斯公式,计算蔗糖水解反应的活化能Ea(106 kJ/mol),该值与文献值接近,这表明选用旋光度法具有良好的可靠性和准确性.To delve into the kinetic attributes of sucrose hydrolysis,the optical rotation was meticulously monitored to track the alterations in optical rotation throughout the hydrolysis process of sucrose.The impacts of diverse acid catalysts and their concentrations,along with the temperature on the rate constant of the hydrolysis reaction were comprehensively scrutinized.The experimental outcomes manifested that the catalytic efficacy of distinct acids towards sucrose hydrolysis varied significantly,among which the catalytic activity of sulfuric acid and nitric acid was conspicuously higher than that of acetic acid.Additionally,a higher concentration of the acid corresponded to a greater reaction rate constant.The activation energy(Ea)of sucrose hydrolysis was computed using the Arrhenius equation,and it was found to be 106 kJ·mol-1,which was closely comparable to the literature value,thereby validating that the experimental selection of the optical rotation method boasted excellent reliability and accuracy.

关 键 词：蔗糖 水解反应 旋光度 反应速率 速率常数 

分 类 号：O64[理学—物理化学]