Journal of the Serbian Chemical Society 2011 Volume 76, Issue 7, Pages: 973-985
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Effects of continuous UV-irradiation on the antioxidant activities of quercetin and rutin in solution in the presence of lecithin as the protective target
Cvetković Dragan, Marković Dejan, Cvetković Dragana, Radovanović Blaga
The stabilities and antioxidant action of two selected flavonoids, quercetin
and rutin, dissolved in methanol and water, toward continuous UV-irradiation
from three different sub-ranges (UV-A, UV-B and UV-C) were studied. The
flavonoids underwent degradation (bleaching) following first-order kinetics.
The bleaching rates were highly dependent on the energy input of the involved
UV-photons. The antioxidant activities of the two flavonoids on UV-induced
lecithin lipid peroxidation were studied by the TBA-MDA test, and appeared to
be also affected by the continuous UV irradiation. The energy input of the
incident UV-photons again played a major governing role, but an impact of the
flavonoids structures cannot be neglected.
Keywords: flavonoids, UV-irradiation, antioxidant, kinetics