Green tea catechins were given to healthy volunteers under controlled diet for 4 consecutive weeks. Plasma concentrations of ascorbate, urate, -tocopherol, -carotene and blood levels of total glutathione were measured before, after the supplementation and the wash-out period. RBC membranes were assayed for their levels of -tocopherol and phosphatidylcholine PUFA’s. Catechin intake provides antioxidant protection in vivo through a cascade involving endogenous antioxidants, which interact differently according to their redox potentials and polarity. As a final beneficial effect, liposoluble vitamin E and -carotene are spared by catechins, resulting in an overall protection against oxidative modification of RBC membrane PUFA’s.
|Titolo:||DIETARY FLAVONOIDS AND INTERACTION WITH ENDOGENOUS ANTIOXIDANTS|
SIMONETTI, PAOLO (Ultimo)
|Parole Chiave:||α-tocopherol; β-carotene; Ascorbate; Endogenous antioxidants; Green tea catechins; PUFA's protection; Redox potentials; Sparing effect|
|Settore Scientifico Disciplinare:||Settore BIO/09 - Fisiologia|
|Data di pubblicazione:||1998|
|Appare nelle tipologie:||01 - Articolo su periodico|