Author/Authors :
Matuszczyk، نويسنده , , Magdalena and Buszman، نويسنده , , Ewa and Pilawa، نويسنده , , Barbara and Witoszy?ska، نويسنده , , Teresa and Wilczok، نويسنده , , Tadeusz، نويسنده ,
Abstract :
Changes in free radicals system of Cladosporium cladosporioides-melanin and model DOPA-melanin caused by diamagnetic Cd2+ ions were studied by electron paramagnetic resonance (EPR) spectroscopy. EPR line of eumelanin was mainly found in the spectrum of Cl.cl.-melanin. Cd2+ ions increased o-semiquinone free radicals concentration in both natural and synthetic melanins. Cd2+ broadened EPR lines of Cl.cl.-melanin in mycelium and the ions fastened spin–lattice relaxation processes. The narrower EPR lines and slower spin–lattice relaxation were obtained for DOPA-melanin–Cd2+ complexes than for DOPA-melanin. Pheomelanin additionally existing in Cl.cl. samples was responsible for differences between the EPR data for Cl.cl. melanin and DOPA-melanin.
