Method for nondestructive detection of exogenously doped sucrose in tea leaves based on near infrared spectrum technology

Abstract

The invention relates to the technical field of tea quality detection. The invention particularly relates to a method for nondestructive detection of exogenously doped sucrose in tea leaves based on anear infrared spectrum technology. The method comprises the following steps: carrying out near infrared spectrum scanning on black tea samples containing different exogenous sucrose contents; carrying out standard normal variable transformation algorithm processing on the original spectral data obtained by scanning; and carrying out variable screening by adopting a continuous projection algorithm, then carrying out principal component analysis, establishing a detection model by using the optimal principal component, and inputting the near infrared spectrum data of the black tea samples to bedetected into the detection model to realize discrimination and content detection of the exogenously doped sucrose in the black tea. The invention aims to solve the problems of difficulty in manual distinguishing of the sugar-added black tea, time and labor waste in physical and chemical detection and the like, realizes nondestructive, rapid and accurate identification of the sugar-added black teaand quantitative detection of the sugar content, and provides a theoretical method and a scientific basis for qualitative and quantitative detection of exogenous sucrose in the black tea.

Description

technical field [0001] The invention relates to the technical field of tea quality detection, in particular to a method for nondestructive detection of exogenously doped sucrose in tea based on near-infrared spectroscopy. Background technique [0002] In recent years, due to consumers' love for black tea, my country's black tea industry has continued to maintain a steady growth trend, and the output of black tea has also gradually increased. According to data from the National Bureau of Statistics, the output of black tea in 2018 reached 233,300 tons, an increase of 251.9% compared with 2008 . With the rise of the black tea industry, there are more and more types of black tea, and high-end black tea is gradually coming into people's field of vision, with sales increasing year by year. At present, there are a small number of high-grade black teas in the market, but their names are not worthy of the name. The reason is that some unscrupulous traders add exogenous sucrose in th...

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a method for non-destructive detection of exogenous sucrose in tea based on near-infrared spectroscopy. , accurate identification and quantitative detection of sugar content, providing a theoretical method and scientific basis for the qualitative and quantitative detection of exogenous sucrose in black tea

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