title: Characterization of cereal flours by fluorescence spectroscopy coupled with PARAFAC.
abstract: This paper presents parallel factor analysis (PARAFAC) of fluorescence of cereal flours. Excitation-emission matrices (EEM's) of different cereal flours (wheat, corn, rye, rice, oat, spelt, barley and buckwheat) were measured in a front-face configuration over the ultraviolet-visible spectral range. EEM's showed that flours strongly fluoresce in two spectral regions, where amino acids, tocopherols, pyridoxine and 4-aminobenzoic acid show intense emissions. 4-component PARAFAC was used to model flour fluorescence and to decompose EEM's into excitation and emission spectra of each component. PARAFAC also provided relative concentrations of these components. The largest differences between flours were found in the concentration levels of the first and third component. Finally, variations in concentrations of PARAFAC modelled components were analysed in relation to the botanical origin of flour samples.
authors.affiliation: University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia.
authors.forename: Lea
authors.initials: L
authors.lastname: Lenhardt
authors.affiliation: University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia.
authors.forename: Ivana
authors.initials: I
authors.lastname: Zeković
authors.affiliation: University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia.
authors.forename: Tatjana
authors.initials: T
authors.lastname: Dramićanin
authors.affiliation: University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia.
authors.forename: Bojana
authors.initials: B
authors.lastname: Milićević
authors.affiliation: University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia.
authors.forename: Jovana
authors.initials: J
authors.lastname: Burojević
authors.affiliation: University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia. Electronic address: dramican@vinca.rs.
authors.forename: Miroslav D
authors.initials: MD
authors.lastname: Dramićanin
mesh_terms: D002523:Edible Grain / Q000737:chemistry*; D005433:Flour / Q000032:analysis*; D013050:Spectrometry, Fluorescence / Q000379:methods*
keywords: Cereals; Flour; Fluorescence; PARAFAC