Method for identifying quality of Biluochun tea

A technology for tea and Biluo, applied in the field of identifying Biluochun tea quality, can solve problems such as differences, and achieve the effect of a simple and effective method

Inactive Publication Date: 2012-05-16
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different grades of tea will have great differences in nutritional composition. At present, Biluochun tea is shoddy. Therefore, it is urgent to establish a Biluochun tea quality identification technology as a practical and effective method to standardize the market.

Method used

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  • Method for identifying quality of Biluochun tea
  • Method for identifying quality of Biluochun tea

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Biluochun tea: produced in Suzhou, Jiangsu.

[0025] The specific operation is as follows:

[0026] 1) UV-visible spectrophotometer scanning:

[0027] Take 3 parts of Biluochun tea of ​​two grades of 1st grade and 2nd grade, 3 samples for each sample, 9 samples for each grade, and take the average value of the samples as the evaluation basis.

[0028] a) Weigh 3g of Biluochun tea leaves for each portion, add 200mL of 90°C water, soak for 5min accurately, filter and set the volume to 250mL, and store the prepared tea soup in a refrigerator at 4°C.

[0029] b) Accurately record the time of preparing tea soup and accurately record the time of sample determination, so that the analyzed samples are kept under the same conditions within 12 hours, and a full-wavelength scan is performed with a UV-visible spectrophotometer (see figure 1 ), according to the UV full-scan spectrum, it was judged that the peak position belonged to polyphenols. Select the HPLC detection wavelengt...

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Abstract

The invention discloses a method for identifying the quality of Biluochun tea, which comprises the following steps of: after soaking the Biluochun tea, scanning the soaked solution by using an ultraviolet and visible spectrophotometer; and, after leaching and extracting another Biluochun tea, measuring the contents of epigallocatechin, epigallocatechin epicatechol gallate, epicatechin and epicatechin epicatechol gallate in the tea from the leached and extracted solution by adopting a high efficiency liquid chromatography. According to the method disclosed by the invention, a technology for identifying the quality of the Biluochun tea is established by adopting (a technology that spectrum and chromatograph are combined) spectrum and chromatograph analysis; the comprehensive evaluation data of green tea quality is provided; the method has the characteristics of being accurate, reliable, simple, convenient and efficient; and the method can be popularized and applied in the field of the green tea quality counterfeit identifying technology.

Description

technical field [0001] The invention belongs to the field of tea identification, and in particular relates to a method for identifying the quality of Biluochun tea leaves. The method can be used for quality evaluation of Biluochun tea leaves from a specific place of origin, a specific brand, and a specific grade. [0002] Background technique [0003] The planting area of ​​tea is relatively large in the world. There are more than 30 countries growing tea in the world. In addition to the direct brewing method that people are used to, tea beverage products are also dazzling in the market and are widely consumed beverages. As a traditional drink of the Chinese nation, tea has a history of four or five thousand years, and the idea that drinking tea is good for health has been accepted by the masses of the people. Green tea refers to unfermented tea, which is made by killing, kneading, drying and other processes. After the finished product is brewed, the tea soup retains mo...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N30/02
Inventor 赵立艳胡秋辉曾晓雄陈贵堂曹婵月
Owner NANJING AGRICULTURAL UNIVERSITY
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