Structural aspects of acylated plant pigments: stabilization of flavonoid glucosides and interpretation of their functions

The enzymatic synthesis of acylated isoquercitrins was accomplished by the lipase-catalyzed transesterification with carboxylic acid vinyl esters as acyl donors in an organic solvent. The introduction of an acyl group into isoquercitrin improved its thermostability and light-resistivity. In particular, isoquercitrin p-coumarate was the most stable of all the acylated isoquercitrins tested.