Effect of Cold Green Tea (<i>Camellia sinensis</i> L.) Extract Derived from Different Cropping Periods or Cultivars on Phagocytic Activity of Macrophage-like Cells

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  • 緑茶冷水（4℃）浸出液のカテキン浸出特性及び茶期・品種の異なる緑茶冷水浸出液がマクロファージ様細胞の貪食能へ与える影響
  • リョクチャ ヒヤミズ(4℃)シンシュツエキ ノ カテキン シンシュツ トクセイ オヨビ チャキ ・ ヒンシュ ノ コトナル リョクチャ ヒヤミズ シンシュツエキ ガ マクロファージ ヨウ サイボウ ノ ドンショクノウ エ アタエル エイキョウ

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The activation of mucosal immunity by drinking of green tea extraction with a high EGC ratio was positively correlated with the activation of macrophage phagocytosis by the green tea extract. Therefore, we estimated the effect of green tea extract derived from different cropping periods or cultivars using phagocytic activity of macrophage-like cells, so that the necessary condition to activate the macrophage phagocytosis was over 2 ratio of EGC to EGCG. The tea leaves harvested in late seasons include many catechins; therefore, the use of the late season leaves is effective way to get many catechins. Moreover, catechins content in tea leaves differs among cultivars. In this study, “Yutakamidori” was high EGC content cultivar.

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