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Detection method for rapid grade appraisal of Wuxi Hao Tea

A technology of Wuxi Haocha and detection method, applied in the field of grade and grade detection, can solve the problems of lack of Wuxi Haocha grade identification method, affecting the interests of regular Wuxi Haocha manufacturers, restricting the marketization process of Wuxi Haocha, etc. High degree of effect

Inactive Publication Date: 2015-04-01
JIANGNAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

In recent years, driven by high profits, the domestic market has been flooded with a large number of shoddy Wuxi tea, which has seriously restricted the marketization process of Wuxi tea, and also affected the interests of regular Wuxi tea manufacturers.
However, there are no papers or patent disclosures on the Wuxi Haocha grade identification method at present.

Method used

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  • Detection method for rapid grade appraisal of Wuxi Hao Tea
  • Detection method for rapid grade appraisal of Wuxi Hao Tea
  • Detection method for rapid grade appraisal of Wuxi Hao Tea

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Samples and instruments

[0056] 1.1 Sample

[0057] The 18 Wuxi Haocha samples from 4 different sources were all spring teas in 2013, and all the tea samples were identified as Wuxi Haocha by the Tea Variety Research Institute.

[0058] 1.2 Instruments

[0059] Trace MS gas chromatography-quadrupole mass spectrometry (Finnigan, USA); manual SPME injector (Supelco, USA); 15 mL headspace bottle (Shanghai Anpu Scientific Instrument Co., Ltd.); DB-WAX column ( 30m×0.25mm×0.25μm).

[0060] 2. Methods and results

[0061] 2.1 Extraction of Wuxi Haocha aroma: crush Wuxi Haocha, pass through a 70-mesh sieve, weigh 2.0 g of the sample into a 15 mL headspace bottle, seal the bottle mouth, preheat it in a water bath at 80°C for 5 minutes, and place the Insert the aged carbon molecular sieve / divinylbenzene / polydimethylsiloxane solid-phase microextraction head into the headspace of the headspace bottle, withdraw it after 40 min of adsorption, and immediately insert it into t...

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Abstract

The invention belongs to the technical field of Wuxi Hao Tea quality detection, and discloses a detection method for rapid grade appraisal of Wuxi Hao Tea. Firstly, aroma of Wuxi Hao Tea is gathered through the headspace solid-phase microextraction (HS-SPME) technique, and the collected aroma is analyzed through gas chromatography-mass spectrometry (GC-MS), so as to construct a Wuxi Hao Tea aroma standard fingerprint spectrum with 35 common peaks; secondly, sensory scores are given to Wuxi Hao Tea samples through sensory evaluations; thirdly, a partial least squares (PLS) regression model for Wuxi Hao Tea aromatic quality is established in a manner that relative contents of the 35 common aromatic components in the Wuxi Hao Tea aroma standard fingerprint spectrum serve as an X matrix and the aromatic sensory scores serve as a Y matrix, the correlation coefficient of the model is 0.973, and the cross-validation correlation coefficient of the model is 0.947. The model has a high fitting degree, can better achieve the aromatic quality predication for Wuxi Hao Tea, and can be used for rapid grade appraisal of Wuxi Hao Tea.

Description

technical field [0001] The invention relates to a detection method for quickly identifying the grade of Wuxi millet tea, in particular to a method for determining the grade of Wuxi millet tea by establishing a partial least square regression (PLS) model of the aroma quality of Wuxi millet tea. The invention belongs to the technical field of Wuxi tea quality inspection. Background technique [0002] Tea is a traditional drink in China, loved for its aroma and taste. At present, the identification of tea quality is mostly based on sensory evaluation, which has high requirements for the evaluation personnel, and the evaluation results are greatly affected by personal factors, which has certain limitations, especially for the identification of origin tea and famous tea, which lacks objective Scientific quantitative basis. "Wuxi Haocha" is produced on the shore of Taihu Lake and is a unique tea variety in Wuxi. The unique climatic and geological conditions endow Wuxi Haocha wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/86
Inventor 李明曹光群杨成曾茜
Owner JIANGNAN UNIV
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