Method for distinguishing production places of flat tea based on stable isotope proportion difference

Abstract

The invention provides a method for distinguishing production places of flat tea based on stable isotope proportion difference. The method is characterized by mainly comprising the following steps: (1) collecting samples and establishing a modeling sample set; (2) detecting stable isotopes, wherein determined indexes are 13C / 12C, 15N / 14N, 18O / 16O, D / 1H, 111Cd / 113Cd, 206Pb / 207Pb, 207Pb / 208Pb and 88Sr / 86Sr; (3) carrying out data standard processing and sample assignment to obtain variables Z(C), Z(N), Z(O), Z(D), Z(Cd), Z(206Pb / 207Pb), Z(207Pb / 208Pb) and Z(Sr); (4) establishing a decision-making tree analyzing model; (5) judging unknown samples. With the adoption of the method provided by the invention, the quality safety of tea leaves can be met, and the faking of the tea leaves can be effectively prevented; the production places are distinguished through decision-making tree analysis, the accurate distinguishing rate of a return test reaches 91.35 percent, the accuracy of an external test reaches 92 percent, and the model is reliable.

Description

technical field [0001] The invention belongs to the identification technology of the origin of agricultural products, and in particular relates to a method for discriminating the origin of flat tea based on the difference in the ratio of stable isotopes. Background technique [0002] my country's tea has a profound cultural background, distinct regional characteristics and quality characteristics, and is a typical product protected by geographical indications. West Lake Longjing tea is the first of the top ten famous teas in my country. It has a history of more than 1,200 years. It is produced in West Lake District, Hangzhou, Zhejiang. Signboard, well-known at home and abroad. At the same time, West Lake Longjing tea also brings higher benefits to its operators because of its great reputation and high quality. At the same time, counterfeit Longjing tea also appears. Although the local government has adopted measures such as protecting the origin of the tea and issuing label...

AI Technical Summary

Problems solved by technology

Although the local government has adopted methods such as protecting the origin of the tea and issuing labels according to the number of producers planted to prevent the occurrence of counterfeit West Lake Longjing tea, the flat tea processed by the same process is difficult to distinguish with the naked eye, and there is still no A very ideal method to identify the authenticity of West Lake Longjing tea

This often brings confusion to consumers. It is of great significance to develop a detection method or model that can identify the authenticity of West Lake Longjing tea to maintain the brand of West Lake Longjing tea and regulate the West Lake Longjing tea market.

In addition, there is no report on the origin identification technology for the main production areas of flat tea in my country

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