Proceedings Volume 2010 (format .pdf) - SimpBTH

Table 2.UV-VIS data of the PVA1, PVA2, PVA3, PVH4, PVH5, PVH6, PVH7 samples in EtOHDomain PVA1 PVA2 PVA3 PVH4 PVH5 PVH6 PVH7 Identification(nm)200-230 - - - 210205 - π→π * transition(u)226228 230280-290 281 281 281 280 280 281 280 π→π * transition315-385 320(u)385340-318-324-321370319373321 n→π * transition400-480590-670---60767080410--615669411--616670---412437474- 615668410437-617669408 conjugatedstructures592 aromatic cycle7060%R50PVA3PVA1PVA24035240 500 1000 1500 2000Wavelength [nm]Fig 1. UV- VIS spectra of the samplesThe main electronic tranzitions in UV-VIS domain are situated at 300-700nm indicating carboxylic, hydroxilic and unsaturated conjugated structures specificto quercetine and rutin [24].Comparing the spectra of the flavonoidic vegetal pigments (PVA1, PVA2,PVA3, PVH4, PVH5, PVH6, PVH7) with the spectra of the standards (rutine andquercetine), we note the presence of common bands, specifics for the flavonoidicstructures [25].234