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Photostability test of hydrolysable tannins of (A) TGII and (B) PGG. The sample solution was irradiated with an ultraviolent lamp of a photochemical reactor (8 W × 16 = 128 W) at 352 nm and a distance of about 3.2 cm for 4 h. n = 3; values are presented as the mean ± standard deviation.
