The aim of this work is to estimate the degradation and change in antioxidant
activity of quercetin in the presence of two different mixtures of
phospholipids in methanol solution, under continuous UV-irradiation from
three different sub-ranges (UV-A, UV-B and UV-C), in the presence and in the
absence of selected UV-absorbing photosensitizer, benzophenone. Quercetin is
employed to control lipid peroxidation process generated by UV-irradiation,
by absorbing part of the UV-incident light, or/and by scavenging the
involved, created free radicals. The results show that quercetin undergoes to
irreversible destruction, highly dependent on UV-photons energy input, more
expressed in the presence than in the absence of benzophenone. In the same
time quercetin expresses suppression effect on lipid peroxidation processes
in UV-irradiated phospholipid mixtures in both cases - absence or presence of
benzophenone (more or less effective, respectively). In UV-C-irradiated
mixtures, benzophenone photosensitizing function is significantly reduced due
to its strong absorption in the same UV-C spectral range, therefore affecting
less antioxidant activity of the remained quercetin.
CHANGES IN THE LIPID STATUS AND LIPID PEROXIDATION PROCESSES OF STERLET BREEDERS RAISED AT FARMS