Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12779/7321
Title: Paramagnetism and Relaxation Dynamics in Melanin Biomaterials
Authors: AL KHATIB, MAHER
Costa, Jessica 
Baratto, Maria Camilla 
Basosi, Riccardo 
Pogni, Rebecca 
Issue Date: 2020
Project: None 
Journal: JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL
Abstract: 
Spectroscopical characterization of melanins is a prior requirement for the efficient tailoring of their radical scavenging, ultraviolet–visible radiation absorption, metal chelation, and natural pigment properties. Electron paramagnetic resonance (EPR), exploiting the common persistent paramagnetism of melanins, represents the elective standard for the structural and dynamical characterization of their constituting radical species. Although melanins are mainly investigated using X-band (9.5 GHz) continuous wave (CW)-EPR, an integration with the application of Q-band (34 GHz) in CW and pulse EPR for the discrimination of melanin pigments of different compositions is presented here. The longitudinal relaxation times measured highlight faster relaxation rates for cysteinyldopa melanin, compared to those of the most common dopa melanin pigment, suggesting pulse EPR spin–lattice relaxation time measurements as a complementary tool for characterization of pigments of interest for biomimetic materials engineering.
Description: 
211300
URI: http://hdl.handle.net/20.500.12779/7321
ISSN: 1520-6106
DOI: 10.1021/acs.jpcb.9b11785
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