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Construction method of tea element fingerprint chromatogram and application thereof to identification of tea origins

A fingerprint and construction method technology, which is applied in the preparation of test samples, measuring devices, and material analysis through electromagnetic means, can solve problems such as difficult identification, and achieve the effect of improving accuracy and good application prospects

Inactive Publication Date: 2018-04-17
INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the serious phenomenon of counterfeit tea leaves in the existing tea market and to provide a new method for constructing tea element fingerprints, and to identify tea origins based on tea element fingerprints. method

Method used

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  • Construction method of tea element fingerprint chromatogram and application thereof to identification of tea origins
  • Construction method of tea element fingerprint chromatogram and application thereof to identification of tea origins
  • Construction method of tea element fingerprint chromatogram and application thereof to identification of tea origins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Construction of tea element fingerprints

[0031] a. Collect 21 representative black tea samples from different planting areas in Yingde City, Guangdong Province.

[0032] b. Microwave digestion and digestion of tea leaves: Accurately weigh 0.3g of uniformly crushed tea samples and place them in a microwave digestion tank, add 5mL of nitric acid, let it stand for 1 hour, then add 1mL of hydrogen peroxide, cover the digestion tank and put it into a microwave digestion instrument After the digestion is completed, drive out the yellow smoke on the electric heating plate, dilute it to 25mL with ultrapure water, and do a process blank experiment at the same time; among them, the conditions of microwave digestion are divided into the following three stages: ①The temperature is 120°C, hold for 2 minutes, and the upper limit of pressure is 35atm; ②The temperature is 150°C, hold for 3 minutes, and the upper limit of pressure is 35atm; ③The temperature is 180°C, hold for 25 m...

Embodiment 2

[0043] Embodiment 2: Identification of origin of Tieguanyin in Anxi, Fujian

[0044] (1) Construction of tea mineral element fingerprints

[0045] a. Collect samples of Tieguanyin in Anxi, Fujian.

[0046] b. Microwave digestion and digestion of tea leaves: Accurately weigh 0.3g of uniformly crushed tea samples and place them in a microwave digestion tank, add 5mL of nitric acid, let it stand for 1 hour, then add 1mL of hydrogen peroxide, cover the digestion tank and put it into a microwave digestion instrument After the digestion is completed, drive out the yellow smoke on the electric heating plate, dilute it to 25mL with ultrapure water, and do a process blank experiment at the same time; among them, the conditions of microwave digestion are divided into the following three stages: ①The temperature is 120°C, hold for 2 minutes, and the upper limit of pressure is 35atm; ②The temperature is 150°C, hold for 3 minutes, and the upper limit of pressure is 35atm; ③The temperature...

Embodiment 3

[0056] The origin identification of embodiment 3 Yunnan Menghai black tea

[0057] (1) Construction of tea element fingerprints

[0058] a. Collect Yunnan Menghai black tea samples.

[0059] b. Microwave digestion and digestion of tea leaves: Accurately weigh 0.3g of uniformly crushed tea samples and place them in a microwave digestion tank, add 5mL of nitric acid, let it stand for 1 hour, then add 1mL of hydrogen peroxide, cover the digestion tank and put it into a microwave digestion instrument After the digestion is completed, drive out the yellow smoke on the electric heating plate, use ultrapure water to set the volume to 25mL, and do a process blank experiment at the same time; among them,

[0060] The conditions of microwave digestion are divided into the following three stages: ① temperature is 120°C, hold for 2 minutes, and the upper limit of pressure is 35 atm; ② temperature is 150°C, hold for 3 minutes, and the upper limit of pressure is 35 atm; The upper limit is...

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Abstract

The invention discloses a construction method of a tea element fingerprint chromatogram and application thereof to identification of tea origins. The construction method comprises the steps that tea samples from different origins are collected and smashed, a microwave digestion device is utilized to dispel and digest tea, then an inductively coupled plasma mass spectrometry is adopted to measure element contents in the tea samples, through a method that data is transformed into a graph, elementary composition is transformed into an abscissa to express element sorts, and an ordinate to expressthe tea element fingerprint chromatogram of the element contents. According to the construction method, the tea elementary composition is firstly transformed into the element fingerprint chromatogram,and the construction method of the tea element fingerprint chromatogram is used for identifying the tea origins, element difference information can be more intuitively reflected, the accuracy of origin identification is improved, and the construction method of the tea element fingerprint chromatogram has the advantages of accuracy, convenience and rapidness, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of analysis and testing. More specifically, the invention relates to a method for constructing tea element fingerprints and a method for identifying tea origin based on the tea element fingerprints. Background technique [0002] Tea is not only rich in organic ingredients such as catechin, cholestenone, and caffeine, but also contains a variety of trace elements that are beneficial to human health. It is known as "one of the three major beverages in the world". As an important economic crop in my country, tea has obvious regional characteristics and is a protected product of geographical landmarks, such as Xinyang Maojian, West Lake Longjing, Anxi Tieguanyin and Dongting Biluochun, etc. Driven by economic interests, some unscrupulous businessmen flood the market with all kinds of counterfeit famous teas. In particular, ordinary teas grown in other places are fried and packaged as famous teas in imitation of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N1/44
CPCG01N1/44G01N27/62
Inventor 吴惠勤张先彩张春华黄晓兰陈亮韩必恺黄芳罗辉泰
Owner INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL