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Flavanol-anthocyanin direct condensation

Fig. 2.103. Structures of all the compounds found in fraction B (a) anthocyanins and acylated anthocyanins direct condensation products between flavanols and anthocyanins (c) dimers resulting from the condensation mediated by acetaldehyde between anthocyanins and flavanols. Reprinted with permission from C. Alcalde-Eon el al. [236]. Fig. 2.103. Structures of all the compounds found in fraction B (a) anthocyanins and acylated anthocyanins direct condensation products between flavanols and anthocyanins (c) dimers resulting from the condensation mediated by acetaldehyde between anthocyanins and flavanols. Reprinted with permission from C. Alcalde-Eon el al. [236].
A.2.2 Anthocyanin-Flavanol and Anthocyanin-Anthocyanin Direct Condensation Reactions... [Pg.444]

Studies in model solution containing an anthocyanin and flavanol oligomers (up to tetramers) at pH 3 carried out at 50 °C demonstrated that temperature is another factor that affects the progress of direct condensation reactions (Malien-Aubert et al. 2002). At acidic pH and high temperature, the anthocyanin is in equilibrium with the colorless chalcone. Although breakage of the flavanol C-C bond occurred under these conditions, the formation of the chalcone impeded the synthesis of F-A products and only A-F adducts were formed (Malien-Aubert et al. 2002). [Pg.447]

In red wines, flavanols may also react directly with anthocyanins, leading to the formation of anthocyanin-flavanol and flavanol-anthocyanin adducts [283-285], The condensation may also occur mediated by aldehydes, such as acetaldehyde, furfural, HMF, benzaldehyde, and others, leading to the formation of alkyl-methine bridged adducts. These latter display the same /Lav in the visible region at around 540 nm, which is bathochromically shifted when compared with the original anthocyanin (/Lax 525 nm) [279, 280, 286-289], thereby contributing to the color change in red wine. [Pg.1786]


See other pages where Flavanol-anthocyanin direct condensation is mentioned: [Pg.445]    [Pg.445]    [Pg.473]    [Pg.445]    [Pg.542]    [Pg.556]    [Pg.104]    [Pg.165]    [Pg.145]    [Pg.161]    [Pg.68]    [Pg.267]    [Pg.425]    [Pg.442]    [Pg.164]    [Pg.199]    [Pg.212]    [Pg.406]    [Pg.64]    [Pg.67]    [Pg.68]   


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Direct condensation

Direct condensation between flavanols and anthocyanins

Flavanol-anthocyanin direct condensation reaction

Flavanoles

Flavanols

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