Abstract
Tea polyphenols is the general name of polyphenols in tea. The content of tea polyphenols determines the quality and quality of tea. At present, the main detection methods of tea polyphenols are spectrophotometry, near infrared spectroscopy and electrochemical analysis. they are carried out in the laboratory. We need a portable testing instrument for rapid field selection of tea plants. It can quickly detect the content of tea polyphenols in fresh tea, help tea farmers quickly screen tea varieties, and realize rapid breeding of tea varieties. In this study, we designed a portable tea polyphenol detector by spectrophotometry. The instrument uses photoelectric sensors to convert light of different wavelengths passing through the sample reaction cell, then AD conversion gets the value of voltage, Finally, STM32 will process, convert voltage values and display content of tea polyphenols. The experimental results show that: There is a good linear relationship between the concentration of tea polyphenols and the absorbance by this system measure. The linear equation is y=0.00769x+0.05945, and the correlation coefficient is 0.99948, which is consistent with the spectrophotometric results of GB/T8313. It can prove that the system can be used to detect the concentration of tea polyphenols in tea.
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