Enantioselective separation of catechin and gallocatechin was achieved by using micellar electrokinetic chromatography (MEKC) modified by cyclodextrin (HP-beta-CD). The analytical enantioseparation of these two catechins was found to be very useful because, for the first time, the presence of (-)-gallocatechin and (-)-catechin (chiral phytomarkers) in tea samples, was regarded as an index of thermal degradation of the product. More than twenty tea samples of different origin (China, Japan, Ceylon) were analysed; the chiral phytomarkers of degradation was found in some of the products proving the occured thermal degradation.
Enantioselective MEKC analysis of catechins in tea samples of different origin
GOTTI, ROBERTO;FIORI, JESSICA
2008
Abstract
Enantioselective separation of catechin and gallocatechin was achieved by using micellar electrokinetic chromatography (MEKC) modified by cyclodextrin (HP-beta-CD). The analytical enantioseparation of these two catechins was found to be very useful because, for the first time, the presence of (-)-gallocatechin and (-)-catechin (chiral phytomarkers) in tea samples, was regarded as an index of thermal degradation of the product. More than twenty tea samples of different origin (China, Japan, Ceylon) were analysed; the chiral phytomarkers of degradation was found in some of the products proving the occured thermal degradation.File in questo prodotto:
Eventuali allegati, non sono esposti
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.