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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Structural characterization of new malvidin 3-glucoside-catechin aryl/alkyl-linked pigments.

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 and 3.2). The formation of new alkyl/aryl-linked adducts corresponding to the structures malvidin 3-glucoside-isobutylcatechin, malvidin 3-glucoside-benzylcatechin, and malvidin 3-glucoside-3-methylbutylcatechin was respectively observed from each aldehyde. The structural characterization of these new structures has been elucidated by 1D and 2D NMR, mass spectrometry, and UV-vis techniques. These new adducts showed the same lambda(max) in the visible region at 540 nm, which is bathochromically shifted 15 nm when compared with the original anthocyanin (lambda(max) = 525 nm).[1]

References

  1. Structural characterization of new malvidin 3-glucoside-catechin aryl/alkyl-linked pigments. Pissarra, J., Lourenço, S., González-Paramás, A.M., Mateus, N., Santos Buelga, C., Silva, A.M., de Freitas, V. J. Agric. Food Chem. (2004) [Pubmed]
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