Structural Characterization of New Malvidin 3-Glucoside-Catechin Aryl/Alkyl-Linked Pigments

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• 作者：Joã ; o Pissarra ; Sandra Louren&ccedil ; o ; Ana M. Gonzá ; lez-Paramá ; s ; Nuno Mateus ; Celestino Santos Buelga ; Artur M. S. Silva ; and Victor de Freitas
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2004
• 出版时间：August 25, 2004
• 年：2004
• 卷：52
• 期：17
• 页码：5519 - 5526
• 全文大小：115K
• 年卷期：v.52,no.17(August 25, 2004)
• ISSN：1520-5118

文摘

The condensation reaction between malvidin 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 malvidin3-glucoside-isobutylcatechin, malvidin 3-glucoside-benzylcatechin, and malvidin 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