Method for identifying producing area of Wuyi rock tea through combination of near infrared spectroscopy and trace element detection

Abstract

The invention relates to a method for identifying the producing area of Wuyi rock tea through a combination of near infrared spectroscopy and trace element detection, belonging to the technical field of identification of the authenticity of products of geographical indication. The objective of the invention is to overcome the problems that single detection data cannot represent all the key information in tracing of a producing area and that data matching is hard to realize for combined usage of detection data of different types in metrological method and other problems in the prior art. According to the invention, near-infrared characteristic spectroscopic data and trace element data of rock tea from different producing areas (including rock tea from and not from a geographically indicated producing area) are fused together for establishing a least squares support vector machine (LS-SVM) analysis model on the basis of a LS-SVM model, and the model is used for objectively and accurately determining the producing area of an extracted sample; the method has the highest identification rate, as high as 100.0% and much higher than LS-SVM determination results composed of single near-infrared or trace element data; and the method has a blind sample identification rate of 100%, so the method has good application prospects.

Description

[0001] (1) Technical field [0002] The invention relates to a method for identifying the origin of Wuyi rock tea by combining near-infrared spectroscopy and trace elements, and belongs to the technical field of authenticity identification of geographical indication products. [0003] (2) Background technology [0004] Geographical indication products refer to products whose quality, reputation or other characteristics are essentially determined by the natural and human factors of the place of origin, and which are named after examination and approval with geographical names. Tea is a typical geographical indication protected product, and its quality and taste are closely related to the geographical conditions, climate factors, environment and other factors of the place of origin. Wuyi rock tea is one of the representative tea products. [0005] At present, domestic and foreign finished tea origin identification methods are based on single instrument detection and analysis comb...

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problem that a single detection data cannot represent all the key information of origin traceability, and also solve the problems of joint use of different types of detection data in metrology methods, analysis of existing data matching, etc., and provide a combined near-infrared Wuyi rock tea origin identification model technology method based on spectral data and trace element data. This method is based on the least squares support vector machine discriminant model, and combines the near-infrared characteristic spectral data and trace element data of rock tea within and outside the origin of the geographical indication. , establish an analysis model, and use the model to objectively and accurately determine the origin of rock tea after extracting samples

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