The condensation reaction between mal
vidin 3-glucoside and catechin mediated by isobutyraldehyde,benzaldehyde, and isovaleraldehyde was conducted in model solutions at two pH values (1.5 and3.2). The formation of new alkyl/aryl-linked adducts corresponding to the structures mal
vidin3-glucoside-isobutylcatechin, mal
vidin 3-glucoside-benzylcatechin, and mal
vidin 3-glucoside-3-methylbutylcatechin was respectively observed from each aldehyde. The structural characterizationof these new structures has been elucidated by 1D and 2D NMR, mass spectrometry, and UV-
vistechniques. These new adducts showed the same
max in the
visible region at 540 nm, which isbathochromically shifted 15 nm when compared with the original anthocyanin (
max = 525 nm).Keywords: Pigment; anthocyanin; catechin; isobutyraldehyde; benzaldehyde; isovaleraldehyde