Fingerprint spectrum recognition method for Pu'er drying green raw tea and based on chemical components

A technology for drying green tea and fingerprints, which is applied in scientific instruments, material separation, and analysis of materials to achieve the effects of good stability and repeatability, simple processing and high recognition rate.

Inactive Publication Date: 2013-10-23
ANHUI AGRICULTURAL UNIVERSITY
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  • Description
  • Claims
  • Application Information

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  • Fingerprint spectrum recognition method for Pu'er drying green raw tea and based on chemical components
  • Fingerprint spectrum recognition method for Pu'er drying green raw tea and based on chemical components
  • Fingerprint spectrum recognition method for Pu'er drying green raw tea and based on chemical components

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1

[0030] This embodiment includes the following steps:

[0031] (1) Establish a fingerprint standard map of Pu'er sun-dried green tea

[0032] a. Take Pu'er sun-dried green hair tea and crush it to 40 meshes, with at least 10 samples;

[0033] b. Weigh 1.0g of tea powder, add 100mL of 80% methanol, 30°C water bath, ultrasonic assisted extraction, 20min, filter paper, wash the filter residue 3 times, combine the filtrate, dilute to 200mL, filter with 0.22μm filter membrane for use;

[0034] c. Use Japanese SHIMADZULC-20AD high performance liquid chromatograph; SPD6AV adjustable wavelength ultraviolet detector (Japan Shimadzu Corporation); LC-solution chromatography workstation; draw samples to high performance liquid chromatograph, determine, get Pu'er sun from different origins The chemical spectrum of Qingmaocha; Chromatographic conditions: Column: waters-C 18 , 5μm, 4.6mm×250mm; mobile phase: phase A is 0.03% trifluoroacetic acid, phase B is nitrile, gradient from 10...

Example Embodiment

[0051] Example 2

[0052] The tea to be tested in this example is flat green tea. As shown in Table 1, during the retention time of the 23 standard fingerprint patterns of sun-dried green hair tea, compare the chromatographic peak areas of sun-dried green hair tea and flat green tea, and the sun-dried green hair tea spectrum and standard fingerprints The overlap rate of the maps is above 96.9%, the correlation coefficient and the angle cosine calculation similarity are above 98.5%; while the flat green tea and the standard fingerprint map overlap rate is only 65.4%, the correlation coefficient and the included angle cosine calculation similarity is 89.4 %, to achieve identification. The other embodiments are the same as in Example 1.

Example Embodiment

[0053] Example 3

[0054] The tea to be tested in this embodiment is dried green hair tea. As shown in Table 1, the overlap rate of the dried green hair tea spectrum and the characteristic fingerprint spectrum are both above 96.9%, and the similarity is above 98.5%, realizing identification. The other embodiments are the same as in Example 1.

[0055] Table 1 The digital standard fingerprint of dried green tea and the discrimination between roasted green tea and flat green tea

[0056]

[0057]

[0058] Note: 0 in the table means 0 when retaining 2 significant digits

[0059] EGC: epigallocatechin; caff: caffeine; (+)C: catechin; EC: epicatechin; EGCG: epigallocatechin gallate; GCG: gallocatechin gallate; ECG : Epicatechin gallate.

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Abstract

The invention discloses a fingerprint spectrum recognition method for Pu'er drying green raw tea and based on chemical components. The fingerprint spectrum recognition method comprises the following steps: establishing a standard fingerprint spectrum of the Pu'er drying green raw tea; establishing a fingerprint spectrum of tea to be measured in the same way; and comparing the fingerprint spectrum of the tea to be measured and the standard fingerprint spectrum of the Pu'er drying green raw tea, and screening the tea to be measured in accordance with the standard fingerprint spectrum of the Pu'er drying green raw tea. The pretreatment of the samples is simple and convenient, so a lot of manpower labor is not required to be spent. The recognition method for the Pu'er drying green raw tea and based on the whole chemical components has relatively good precision, stability and repeatability, and has high recognition rate.

Description

technical field [0001] The invention relates to a method for identifying Pu-erh sun-dried green tea, in particular to a method for identifying fingerprints of Pu-er sun-dried green tea based on chemical components. Background technique [0002] Pu'er tea production areas are widely distributed in Yunnan Province, and the quality of sun-dried green tea produced at different times, different regions, and different years is very different; The stable quality of tea has brought hidden dangers. At present, the identification and quality evaluation of raw tea mostly rely on sensory evaluation. Due to its own limitations, sensory evaluation lacks objective quantitative basis, which has a great impact on the stability of Pu-erh tea quality. [0003] Fingerprint is a comprehensive and quantifiable means of identification, which has been widely used in many fields such as environmental protection, petroleum exploration, food evaluation, seed detection and variety identification. Pue...

Claims

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Application Information

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IPC IPC(8): G01N30/02
Inventor 宁井铭宛晓春张正竹
Owner ANHUI AGRICULTURAL UNIVERSITY
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