Citation: Yao Chen, Bing Peng, Yuchi Zhao, Xiang Xiao, Tong Wang. Professional Synthesis and Innovation Experiment: Rapid Identification Experiment of Tea Grades Based on Colorimetric Sensor Array and Chemometrics[J]. University Chemistry, ;2026, 41(2): 366-374. doi: 10.12461/PKU.DXHX202503043 shu

Professional Synthesis and Innovation Experiment: Rapid Identification Experiment of Tea Grades Based on Colorimetric Sensor Array and Chemometrics

Yao Chen ^1,2 ,
Bing Peng ¹ ,
Yuchi Zhao ¹ ,
Xiang Xiao ¹ ,
Tong Wang ^2,,

1.
School of Biological Science and Medical Engineering, Hunan University of Technology, Zhuzhou 412007, Hunan Province, China;
2.
State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China

Corresponding author: Tong Wang, wangtong@hnu.edu.cn
Received Date: 10 March 2025
Revised Date: 13 May 2025

With the continuous expansion of the tea-drinking population in China and the improvement of people's quality of life, premium and high-quality teas have become increasingly popular, leading to a rapid increase in demand. This innovative experiment capitalizes on the varying contents of tea polyphenols and amino acids in teas of different grades. It developed a simple and cost-effective colorimetric sensor array based on the indicator replacement principle for the rapid identification of two grades of Wuyishan rock tea (Niulankeng cinnamon and ordinary cinnamon). The RGB values of images captured through smartphone photography are extracted using MATLAB software, followed by analysis of the RGB data through partial least squares discriminant analysis (PLS-DA). The results demonstrate that this method can quickly and accurately distinguish between different grades of tea, with a classification accuracy of 100%. This innovative experiment addresses practical challenges and is closely aligned with cutting-edge scientific research, effectively enhancing students’ comprehensive experimental skills. The integration of advanced chemometrics and mobile imaging technology not only increases students’ interest in and understanding of subjects like image processing and data analysis, but also boosts their participation in scientific experiments and deepens their critical thinking. Furthermore, due to its reliance on inexpensive equipment and the clear visual effects it provides, the experiment can be applied in the development of comprehensive experimental curricula in universities. This approach could help solve issues such as the shortage of large-scale precision instruments and the monotony of experiments in certain institutions.
- Colorimetric sensor array,
- Tea grade,
- Smartphone imaging,
- Chemometrics
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