In the apoplasm, the toxicity of V(V) and V(IV) can be limited through redox and complexation reactions involving phenolic substances and polyuronic components. In such a context, we report about the reducing activity of caffeic acid (CAF) towards V(V) and the role of polygalacturonic acid (PGA) on this redox reaction. The results show that the reaction, particularly fast in the 2.0-3.0 pH range, leads to the formation of oxidation products of caffeic acid, also active in the reduction of V(V). The redox reaction is faster in presence of polygalacturonic acid that acts as a complexing agent of V(IV) ions in the whole pH range (2.5-6.0) investigated.
Vanadate reduction by caffeic acid: a mechanism of biological importance / Deiana, Salvatore Andrea; Lauro, G; Silvetti, Margherita; Castaldi, Paola. - 1:(2010), pp. 108-109. (Intervento presentato al convegno XXVth International Conference on Polyphenols tenutosi a Montpellier, Le Corum nel 24-27 August, 2010).
Vanadate reduction by caffeic acid: a mechanism of biological importance
DEIANA, Salvatore Andrea;SILVETTI, Margherita;CASTALDI, Paola
2010-01-01
Abstract
In the apoplasm, the toxicity of V(V) and V(IV) can be limited through redox and complexation reactions involving phenolic substances and polyuronic components. In such a context, we report about the reducing activity of caffeic acid (CAF) towards V(V) and the role of polygalacturonic acid (PGA) on this redox reaction. The results show that the reaction, particularly fast in the 2.0-3.0 pH range, leads to the formation of oxidation products of caffeic acid, also active in the reduction of V(V). The redox reaction is faster in presence of polygalacturonic acid that acts as a complexing agent of V(IV) ions in the whole pH range (2.5-6.0) investigated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
