Wereportadetailedinvestigationoffluorescencepropertiesofsyntheticeumelaninpigmentin solution.Acompletesetoffluorescencespectrainthenear-UVandvisiblerangeisanalysed.Excitation spectraatafewselectedemissionenergiesarealsoinvestigated.Ourmeasurementssupportthe hypothesisthatfluorescenceineumelaninisrelatedtochemicallydistinctoligomericunitsthatcanbe selectivelyexcited.Fluorescenceduetolargeoligomersystemsisspectrallydifferentiatedfromthatdue to monomersandsmalloligomersystems.Fluorescenceexcitationmeasurementsshowthe contributionof5,6-dihydroxyndole-2-carboxylicacidand5,6-dihydroxyndolemonomerstothe emissionofsmall-sizeoligomers. & 2008ElsevierB.V.Allrightsreserved.
Fluorescence spectroscopy of synthetic melanin in solution
PERNA, GIUSEPPE;FRASSANITO, MARIA CRISTINA;GALLONE, ANNA;CAPOZZI, VITO GIACOMO
2009-01-01
Abstract
Wereportadetailedinvestigationoffluorescencepropertiesofsyntheticeumelaninpigmentin solution.Acompletesetoffluorescencespectrainthenear-UVandvisiblerangeisanalysed.Excitation spectraatafewselectedemissionenergiesarealsoinvestigated.Ourmeasurementssupportthe hypothesisthatfluorescenceineumelaninisrelatedtochemicallydistinctoligomericunitsthatcanbe selectivelyexcited.Fluorescenceduetolargeoligomersystemsisspectrallydifferentiatedfromthatdue to monomersandsmalloligomersystems.Fluorescenceexcitationmeasurementsshowthe contributionof5,6-dihydroxyndole-2-carboxylicacidand5,6-dihydroxyndolemonomerstothe emissionofsmall-sizeoligomers. & 2008ElsevierB.V.Allrightsreserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
