Preliminary Study of Oaklins,a New Class of Brick-Red Catechinpyrylium Pigments Resulting from the Reaction between Catechin and Wood Aldehydes

摘要

Several structurally related pigments were found to result from the reaction between catechin and coniferaldehyde/sinapaldehyde extracted from oak wood.Their structures were tentatively identified by mass spectrometry,and their formation was studied in different pH and temperature conditions for several days.They were all found to have a characteristic catechinpyrylium core,thereby constituting a new class of compounds named as oaklins.One of the main oaklins was also detected in a commercial table red wine aged in oak barrels.