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Citation: Jingyu Wang, Heng Wang, Hui Xiong, Zhifei Chen, Hong Yuan. Discussions on How to Improve the Comprehensive Innovation Abilities of Students by Designed Experiments: An Example of Simultaneous Determination of Vitamin C and E by Spectrophotometry[J]. University Chemistry, ;2020, 35(9): 76-82. doi: 10.3866/PKU.DXHX201908025 shu

Discussions on How to Improve the Comprehensive Innovation Abilities of Students by Designed Experiments: An Example of Simultaneous Determination of Vitamin C and E by Spectrophotometry

1.
School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China;
2.
National Demonstration Center for Experimental Chemistry Education, College of Chemistry (Central China Normal University), Wuhan 430079, P. R. China

Received Date: 17 August 2019

Simultaneous determination of vitamin C and vitamin E by spectrophotometry is a typical experiment of simultaneous determination of multiple components. However, the current experimental method has a large relative error (13.7%) in the determination of vitamin C. In this paper, according to the molecular structural characteristics of vitamin C and vitamin E, we studied the factors affecting the measurement accuracy of vitamin C and improve the experimental method by optimization pf design, and the error is reduced to 1.98%. Results proved that the improved method achieved higher accuracy, better reproducibility, more reliable results and better teaching responses. Through this designed experiment, the students are guided from many aspects such as aiming at practical problems and using theoretical knowledge to optimize the experimental scheme, therefore their comprehensive innovation abilities are improved.
- Simultaneous determination,
- Vitamin C,
- Vitamin E,
- Spectrophotometry,
- Comprehensive innovation ability
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