食品专业动力学实验教学设计——胭脂红降解反应-《集美大学学报（教育科学版）》

文章信息/Info

Title:: Design of Kinetic Experiment Teaching for Food Specialty-carmine Degradation Reaction

Author(s):: LIN Zheng-zhong; OU Guang-nan; HUANG Zhi-yong; CHEN Su-yan; WANG Li; ZhONG Hui-ping; (College of Food and Biological Engineering,Jimei University，Xiamen 361021，China)

Keywords:: Persulfate; Silver ion; Carmine; Kinetics; Innovation experiment; Teaching design

摘要:: 利用K2S2O8-AgNO3体系催化降解胭脂红。通过加大K2S2O8用量，保持反应时K2S2O8和AgNO3浓度近似不变，控制反应匀速进行，并根据吸光度变化值测试反应速率。进一步采用对比消除法测出K2S2O8，AgNO3和胭脂红色素的级数分别为1，1，0。根据实验结果设计新的教学方案，包括实验前的准备、实验过程和数据处理等环节。并根据相关环节的完成情况制定评分标准。新方案相对旧方案，试剂毒性低，实验过程中反应体系保持澄清，测量数据变化明显,实验内容与食品专业或环境专业相关。实际教学对比表明学生对于新方案的完成情况优于旧方案。

Abstract:: In this paper carmine was degraded under a catalytic reaction system of K2S2O8 AgNO3.Much excess K2S2O8 was added to keep constant concentrations of K2S2O8 and AgNO3，and constant reaction velocities.The reaction velocities were determined based on the absorbance shift values.The orders of K2S2O8，AgNO3 and carmine were further calculated to be 1，1，0 respectively by using method of contrast-elimination.A kinetic experiment teaching scheme was designed on the basis of the study，including different stages like preparation，experiment process and data treatment.A set of scoring criteria was established based on the accomplishment at different stages.The new scheme had the merits of low toxicity，low price，clear phenomena，and sensitive variation compared with the traditional scheme of K2S2O8 AgNO3-Cr2(SO4)3.The experiment is highly relative to food specialty and environment specialty that it will stimulate learning interest of students.The new scheme had been applied in the students of food specialty.The trial implementation shown that completion indexes collected from students were superior to those of the traditional dynamic scheme.Promotion and implementation of the new scheme will be helpful for students to learn principle and experience process more effectively.