title: Front-face fluorescence spectroscopy combined with second-order multivariate algorithms for the quantification of polyphenols in red wine samples.
abstract: The potential of front-face fluorescence spectroscopy combined with second-order chemometric methods was investigated for the quantification of the main polyphenols present in wine samples. Parallel factor analysis (PARAFAC) and unfolded-partial least squares coupled to residual bilinearization (U-PLS/RBL) were assessed for the quantification of catechin, epicatechin, quercetin, resveratrol, caffeic acid, gallic acid, p-coumaric acid, and vanillic acid in red wines. Excitation-emission matrices of different red wine samples, without pretreatment, were obtained in front-face mode, recording emission between 290 and 450 nm, exciting between 240 and 290 nm, for the analysis of epicatechin, catechin, caffeic acid, gallic acid, and vanillic acid; and excitation and emission between 300-360 and 330-400nm, respectively, for the analysis of resveratrol. U-PLS/RBL algorithm provided the best results and this methodology was validated by an optimized liquid chromatographic coupled to diode array and fluorimetric detectors procedure, obtaining a very good correlation for vanillic acid, caffeic acid, epicatechin and resveratrol.
authors.affiliation: Technological Institute of Food and Agriculture (CICYTEX-INTAEX), Junta de Extremadura, Avda. Adolfo Suárez S/N, 06007 Badajoz, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: Cabrera-Bañegil
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Extremadura, 06006 Badajoz, Spain.
authors.forename: María Del Carmen
authors.initials: MD
authors.lastname: Hurtado-Sánchez
authors.affiliation: Department of Analytical Chemistry and Research Institute on Water, Climate Change and Sustainability (IACYS), University of Extremadura, 06006 Badajoz, Spain.
authors.forename: Teresa
authors.initials: T
authors.lastname: Galeano-Díaz
authors.affiliation: Department of Analytical Chemistry and Research Institute on Water, Climate Change and Sustainability (IACYS), University of Extremadura, 06006 Badajoz, Spain. Electronic address: iduran@unex.es.
authors.forename: Isabel
authors.initials: I
authors.lastname: Durán-Merás
mesh_terms: D000465:Algorithms; D002853:Chromatography, Liquid; D003373:Coumaric Acids / Q000032:analysis; D059808:Polyphenols / Q000032:analysis*; D011422:Propionates; D000077185:Resveratrol; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013267:Stilbenes / Q000032:analysis; D014920:Wine / Q000032:analysis*
chemical_list: D003373:Coumaric Acids; D059808:Polyphenols; D011422:Propionates; D013267:Stilbenes; C495469:p-coumaric acid; D000077185:Resveratrol
keywords: (+)-Catechin (PubChem CID: 9064); 3,4′,5-Trihydroxystilbene (Resveratrol) (PubChem CID: 445154); Caffeic acid (PubChem CID: 689043); Epicatechin (PubChem CID: 72276); Excitation-emission matrices; Front-face fluorescence; Gallic acid (PubChem CID: 370); Parallel factor analysis; Polyphenols; Unfolded partial least squares; Vanillic acid (PubChem CID: 8468); Wine