title: Spectroscopic manifestations of flavomononucleotide dimers in polyvinyl alcohol films.
abstract: Absorption and fluorescence spectra of flavomononucleotide (FMN) in polyvinyl alcohol films (PVA) over a very wide concentration range are investigated. The dimerization constant as well as the pure monomer and dimer spectra are calculated and the structural parameters of FMN dimer are established. Excitation wavelength and temperature dependencies of FMN/PVA fluorescence spectra for different FMN concentrations were carried out. These measurements together with those of absorption reveal that dimers are imperfect traps for excitation energy and that the energy transfer can occur both in forward and in reverse direction. Moreover, it was shown that the observed temperature changes in fluorescence spectra may be qualitatively explained by the effect of inhomogeneous broadening of FMN energy levels and by the presence of fluorescent dimers.
authors.affiliation: Department of Physics and Biophysics, University of Agriculture and Technology, Olsztyn, Poland.
authors.forename: H
authors.initials: H
authors.lastname: Grajek
authors.forename: G
authors.initials: G
authors.lastname: Zurkowska
authors.forename: P
authors.initials: P
authors.lastname: Bojarski
authors.forename: B
authors.initials: B
authors.lastname: Kukliński
authors.forename: B
authors.initials: B
authors.lastname: Smyk
authors.forename: R
authors.initials: R
authors.lastname: Drabent
authors.forename: C
authors.initials: C
authors.lastname: Bojarski
mesh_terms: D019281:Dimerization; D004735:Energy Transfer; D005486:Flavin Mononucleotide / Q000737:chemistry*; D008956:Models, Chemical; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013057:Spectrum Analysis
chemical_list: D005486:Flavin Mononucleotide; D011142:Polyvinyl Alcohol