Study by LC/ESI/MSn and ESI/HR/MS of SO2 interactions in flavanols–aldehydes nucleophilic reactions

The study concerns the interactions between (+)-catechin and a representative oak wood aldehyde (5-(hydroxymethyl)furfuraldehyde for furanic aldehydes and vanillin for phenolic aldehydes) in a wine-like model solution in presence or not of SO2. The formed condensation products were characterised by LC/MS, LC/ESI/MSn, and ESI/HR/MS and we studied the effect of SO2 on these condensation reactions.