title: Fluorescent fingerprints of edible oils and biodiesel by means total synchronous fluorescence and Tucker3 modeling.
abstract: The present work proposes the use of total synchronous fluorescence spectroscopy (TSFS) as a discrimination methodology for fluorescent compounds in edible oils, which are preserved after the transesterification processes in the biodiesel production. In the same way, a similar study is presented to identify fluorophores that do not change in expired vegetal oils, to associate physicochemical parameters to fluorescent measures, as contribution to a fingerprint for increasing the chemical knowledge of these products. The fluorescent fingerprints were obtained by Tucker3 decomposition of a three-way array of the total synchronous fluorescence matrices. This chemometric method presents the ability for modeling non-bilinear data, as Total Synchronous Fluorescence Spectra data, and consists in the decomposition of the three way data arrays (samples×Δλ×λ excitation), into four new data matrices: A (scores), B (profile in Δλ mode), C (profile in spectra mode) and G (relationships between A, B and C). In this study, 50 samples of oil from soybean, corn and sunflower seeds before and after its expiration time, as well as 50 biodiesel samples obtained by transesterification of the same oils were measured by TSFS. This study represents an immediate application of chemical fingerprint for the discrimination of non-expired and expired edible oils and biodiesel. This method does not require the use of reagents or laborious procedures for the chemical characterization of samples.
authors.affiliation: FIA Lab., INQUISUR - CONICET, Sector Química Analítica, Universidad Nacional del Sur. Av. Alem 1253, B8000CPB Bahía Blanca, Argentina. Electronic address: matiasi@conicet.gov.ar.
authors.forename: Matías
authors.initials: M
authors.lastname: Insausti
authors.affiliation: Faculdade de Química, Instituto de Ciências Exatas da Universidade Federal do Sul e Sudoeste do Pará. Folha 17, Quadra 04, Lote Especial, Nova Marabá, CEP: 68505080 Marabá, Pará, Brazil.
authors.forename: Adriano
authors.initials: A
authors.lastname: de Araújo Gomes
authors.affiliation: Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP), Mendoza 109, L6302EPA Santa Rosa, La Pampa, Argentina; Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa (UNLPam), Av. Uruguay 151, L6300CLB Santa Rosa, La Pampa, Argentina. Electronic address: jcaminia@exactas.unlpam.edu.ar.
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Camiña
authors.affiliation: Universidade Federal da Paraíba, Departamento de Química, Laboratório de Automação e Instrumentação em Química Analítica/Quimiometria (LAQA), Caixa Postal 5093, CEP 58051-970 João Pessoa, PB, Brazil. Electronic address: laqa@quimica.ufpb.br.
authors.forename: Mario Cesar Ugulino
authors.initials: MC
authors.lastname: de Araújo
authors.affiliation: FIA Lab., INQUISUR - CONICET, Sector Química Analítica, Universidad Nacional del Sur. Av. Alem 1253, B8000CPB Bahía Blanca, Argentina.
authors.forename: Beatriz Susana Fernández
authors.initials: BS
authors.lastname: Band
mesh_terms: D056804:Biofuels / Q000032:analysis*; D016002:Discriminant Analysis; D008958:Models, Molecular; D010938:Plant Oils / Q000032:analysis*; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D056804:Biofuels; D010938:Plant Oils
keywords: Biodiesel and edible oils discrimination; Fluorescent fingerprints; Total synchronic fluorescence spectroscopy; Tucker3 model