Determination of caffeic and chlorogenic acids and their derivatives in different sunflower seeds

Five different genotypes (Tesoro, Marko, Clip, Vyp-70 and Nanta) of sunflow er seeds were studied and the phenolic compositions of their kernel and hul l were characterised by HPLC and MS techniques. The main phenolic compounds present in both the kernel and hull are chlorogenic acid, caffeic acid and two caffeoylquinic derivatives. Both derivatives were characterised by par tial alkaline hydrolysis and LC/MS. The four phenolic compounds present in the kernel ranged from 94.6% (genotype Clip) to 99.3% (genotype Marko) of t he total phenolic compounds of the whole seed. Therefore the dehulling of t he seed scarcely improves its nutritional value. (C) 2000 Society of Chemic al Industry.