SUMMARYTea has been considered a medicine and a healthy beverage since ancient times, but recently it has received a great deal of attention because of its antioxidant properties. Green tea polyphenols have demonstrated to be an effective chemopreventive agent. Recently, investigators have found that EGCG, one of the green tea catechins, could have anti-HIV effects when bound to CD4 receptor. Many factors can constitute important influences on the composition of tea, such as species, season, age of the leaf, climate, and horticultural practices (soil, water, minerals, fertilizers). This paper presents an HPLC analytical methodology development, using column RP-18 and mobile phase composed by water, acetonitrile, methanol, ethyl acetate, glacial acetic acid (89:6:1:3:1 v/v/v/v/v) for simultaneous determination and quantification of caffeine (CAF), catechin (C), epicatechin (EC) and epigallocatechin gallate (EGCG) in samples of Camellia sinensis (green tea) grown in Brazil and harvested in spring, in summer and in autumn, in comparison to Brazilian black tea, to samples of Japanese and Chinese green tea and to two standardized dry extracts of green tea. The method has been statistically evaluated and has proved to be adequate to qualitative and quantitative determination of the samples. Keywords: HPLC; EGCG; catechin; Camellia sinensis; Brazilian green tea. RESUMOMÉTODO RÁPIDO PARA DETERMINAÇÃO DE GALATO DE EPIGALOCATEQUINA (EGCG), EPICATEQUINA (EC), CATEQUINA (C) E CAFEÍNA (CAF) EM CHÁ VERDE USANDO CLAE. O chá vem sendo considerado uma bebida saudável e com propriedades medicinais desde tempos bem remotos, mas recentemente tem ganhado grande interesse no meio científico devido a suas atividades como antioxidante. Os polifenóis do chá verde vêm demonstrando possuir atividades quimiopreventivas. Recentemente, pesquisadores descobriram que o EGCG, a principal catequina do chá verde, poderia ter efeito anti-HIV quando acoplado ao receptor CD4. Muitos fatores podem influenciar de forma significativa na composição do chá, como sua espécie, estação que foi colhida, idade da folha, clima e técnicas de cultura (solo, irrigação e fertilizantes). Este artigo vem apresentar uma metodologia analítica desenvolvida para análise em CLAE, usando coluna de fase reversa C-18 e fase móvel composta de água, acetonitrila, metanol, acetato de etila, ácido acético glacial (89:6:1:3:1 v/v/v/v/v) para análise simultânea de cafeína (CAF), catequina (C), epicatequina (EC) e galato de epicatequina (EGCG) em amostras de chá verde, cultivado no Brasil, e colhidas nas estações de primavera, verão e outono; comparando-os com o chá preto brasileiro, amostras de chá verde japonês e chinês e também com dois extratos padronizados importados de chá verde. O método foi avaliado estatisticamente e se mostrou adequado para analisar qualitativamente e quantitativamente as amostras. Palavras-chave: CLAE; EGCG; catequina; Camellia sinensis; chá verde brasileiro.have found that EGCG, a green tea catechin, could have anti-HIV effects when bound to CD4 recept...
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