Phytochemical Characterization and Chemical Stability of Green Tea Extract

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.