Phytochemical Characterization and Chemical Stability of Green Tea Extract

Revista Virtual de Química Pub Date : 2022-01-01 DOI:10.21577/1984-6835.20220069

Ana Paula Azevêdo Macêdo, Mariane dos Santos Gonçalves, Oscar Caetano da Silva Neto, Ricardo David Couto, Jorge Mauricio David

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Abstract

tea From a of view, phytochemical analyzes is essential to know the composition and concentration of compounds in green tea, as well as the stability of these components. In this study the phytochemical properties and chemical stability of green tea were evaluated. A sample, widely sold in was submitted to following of analyzes for detection of the main compounds and evaluation of the stability of green tea extract preparations by HPLC. As result, the green tea extract presented caffeine (34.4%), epi catechin gallate (11.9%), and epi gallocatechin (5.8%) as main identified compounds in its composition. During the four weeks of evaluation, the main metabolites presented small decomposition rate (2.4 to 2.9%). In addition, the phytochemical analysis revealed the presence of several secondary metabolites in their composition (alkaloids, glycosides, saponins, tannins, terpenoids, caffeine and flavonoids). This demonstrates that green tea extract has compounds with properties that bring health benefits but also as it contains other secondary metabolites, and its therapeutic use should be carefully evaluated.

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绿茶提取物的植物化学性质及化学稳定性

从一个角度来看，植物化学分析对于了解绿茶中化合物的组成和浓度以及这些成分的稳定性至关重要。本研究对绿茶的植物化学性质和化学稳定性进行了评价。采用HPLC法对一种销售广泛的样品进行了主要成分的检测和绿茶提取物制剂的稳定性评价。结果表明，绿茶提取物的主要鉴定成分为咖啡因(34.4%)、儿茶素没食子酸酯(11.9%)和儿茶素(5.8%)。在4周的评估中，主要代谢物的分解率较小(2.4 ~ 2.9%)。此外，植物化学分析显示其成分中存在几种次生代谢物(生物碱、苷类、皂苷、单宁、萜类、咖啡因和黄酮类)。这表明绿茶提取物具有对健康有益的化合物，但也含有其他次级代谢物，其治疗用途应仔细评估。

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Revista Virtual de Química

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