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(a,b) UHPLC-DAD-MS analysis of caffeic acid metabolites. UV-visible, MS1 and MS2 data of two isomers tentatively identified as oxidized CA trimers (CA3: m/z = 3 × 180 − 4 − 1 = 535, oxidized CA3 (CA3-6H): m/z = 536 – 6 − 1 = 529). (c) Metabolites of CA from alperujo in culture media (B). Values are expressed in CA equivalent as mean ± SD (n = 4). ●: FA in the basolateral side; ■: isomer 1 of CA metabolite in cells; ▲: isomer 2 of CA metabolite in cells.
