Figure 6.
LC chromatograms of the samples taken from apical sides after loading CG (line in red) and ECG (line in blue) in the basolateral side, obtained by the negative ESI/MS interface extracted with (A) 521 [M − H]−, (B) 455 [M − H]−, and (C) 535 [M − H]−. The relative content of the catechin metabolites were measured as free-form equivalents, relative to the internal standard. Each value was the average of three different samples; ** indicates significantly different at a 0.01 level. Mean values with the same lowercase letters indicate no significant difference at a 0.05 level.