Detection method for rapidly and accurately quantifying nitrogen and oxygen heterocyclic compounds in green tea and method for evaluating drying degree of green tea
A technology for the detection of nitrogen-oxygen heterocycles, which is applied in the field of chemical analysis, can solve the problems of low levels of nitrogen-oxygen heterocycles, which are difficult to detect, and the interference of target analysis, and achieve simple and fast sample pretreatment, high sensitivity, and temperature control. accurate effect
Active Publication Date: 2021-12-24
TEA RES INST CHINESE ACAD OF AGRI SCI
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[0005] Aiming at the deficiencies in this field, the present invention provides a rapid and accurate detection method for quantitative nitrogen-oxygen heterocyclic compounds in green tea, which can realize the detection of green tea Simultaneous qualitative and quantitative detection of 7 nitrogen-oxygen heterocyclic compounds in green tea, with good selectivity and high sensitivity, which solves the problem that the level of nitrogen-oxygen heterocyclic compounds in green tea is low and difficult to detect, and the complex matrix of tea leaves seriously interferes with the analysis of target objects Affected by the rapid and accurate determination of nitrogen-oxygen heterocyclic compounds in green tea
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[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The operating methods not indicated in the following examples are generally in accordance with conventional conditions, or in accordance with the conditions suggested by the manufacturer.
[0046] 1. Instruments and reagents
[0047] 1.1 Instrument
[0048] 7890A-7000C gas chromatography-mass spectrometry instrument (Agilent Technologies, USA); arrow-shaped solid phase microextraction handle and extraction fiber head (Agilent Technologies, USA); arrow-shaped solid phase microextraction fiber head mainly uses Carbon WR SPME Arrow; AL 204 electronic analytical balance (Mettler-Toledo Instruments Shanghai Co., Ltd.); headspace bottle (20mL, Agilent Technologies); sealing cap (polytetrafluor...
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Abstract
The invention discloses a detection method for rapidly and accurately quantifying nitrogen and oxygen heterocyclic compounds in green tea and a method for evaluating the drying degree of the green tea. The invention particularly relates to a detection method for rapidly analyzing nitrogen and oxygen heterocyclic compounds in green tea by combining a metal bath assisted arrow-shaped solid-phase microextraction technology with a gas chromatography-triple quadrupole tandem mass spectrometry technology. According to the detection method of the nitrogen-oxygen heterocyclic compounds, the seven nitrogen-oxygen heterocyclic compounds in the tea can be qualitatively and quantitatively detected at the same time, the selectivity is good, and the sensitivity is high. The problems that the nitrogen-oxygen heterocyclic compounds in the green tea are low in level, and analysis of a target object is seriously interfered by a complex tea matrix are solved. The method can realize rapid and accurate determination of nitrogen and oxygen heterocyclic compounds in green tea. According to the green tea drying degree evaluation method, furanaldehyde is screened and put forward as a key index compound for evaluating the box-type hot air drying degree (water content).
Description
technical field [0001] The invention relates to the field of chemical analysis, in particular to a rapid and accurate detection method for quantifying nitrogen-oxygen heterocyclic compounds in green tea and a method for evaluating the drying degree of green tea. Background technique [0002] Green tea is one of the main types of tea in my country. It is favored by consumers for its high-quality aroma and strong taste, such as West Lake Longjing, Xinyang Maojian and Biluochun. At present, in the study of aroma components of green tea, more than 200 aroma components including alcohols, aldehydes, ketones, esters, acids, and nitrogen-oxygen heterocyclic compounds have been isolated and identified, among which pyrazine, pyridine, pyrrole, furan, furfural Nitrogen-oxygen heterocyclic compounds, such as nitrogen and oxygen heterocycles, have prominent aroma characteristics and low aroma threshold, which have an important contribution to the formation of green tea characteristic qu...
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IPC IPC(8): G01N30/02G01N30/06G01N30/86
CPCG01N30/02G01N30/06G01N30/8679G01N2030/045G01N2030/062
Inventor 杨艳芹江用文袁海波邓余良谢佳灵滑金杰李佳沈帅王近近朱佳依朱宏凯
Owner TEA RES INST CHINESE ACAD OF AGRI SCI