Chemometric study of Andalusian extra virgin olive oils Raman spectra: Qualitative and quantitative information.
Authentication of extra virgin olive oil (EVOO) is an important topic for olive oil industry. The fraudulent practices in this sector are a major problem affecting both producers and consumers. This study analyzes the capability of FT-Raman combined with chemometric treatments of prediction of the fatty acid contents (quantitative information), using gas chromatography as the reference technique, and classification of diverse EVOOs as a function of the harvest year, olive variety, geographical origin and Andalusian PDO (qualitative information). The optimal number of PLS components that summarizes the spectral information was introduced progressively. For the estimation of the fatty acid composition, the lowest error (both in fitting and prediction) corresponded to MUFA, followed by SAFA and PUFA though such errors were close to zero in all cases. As regards the qualitative variables, discriminant analysis allowed a correct classification of 94.3%, 84.0%, 89.0% and 86.6% of samples for harvest year, olive variety, geographical origin and PDO, respectively.
Organic Chemistry Department, Campus de Excelencia Internacional CeiA3, University of Córdoba, Campus de Rabanales, Marie Curie Building, E-14014 Córdoba, Spain.
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Sánchez-López
Statistics and Business Department, University of Córdoba, Avda. Puerta Nueva, s/n, E-14071 Córdoba, Spain.
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Sánchez-Rodríguez
Organic Chemistry Department, Campus de Excelencia Internacional CeiA3, University of Córdoba, Campus de Rabanales, Marie Curie Building, E-14014 Córdoba, Spain. Electronic address: alberto.marinas@uco.es.
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Marinas
Organic Chemistry Department, Campus de Excelencia Internacional CeiA3, University of Córdoba, Campus de Rabanales, Marie Curie Building, E-14014 Córdoba, Spain.
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Marinas
Organic Chemistry Department, Campus de Excelencia Internacional CeiA3, University of Córdoba, Campus de Rabanales, Marie Curie Building, E-14014 Córdoba, Spain.
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Urbano
Statistics and Business Department, University of Córdoba, Avda. Puerta Nueva, s/n, E-14071 Córdoba, Spain.
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Caridad
Organic Chemistry Department, Campus de Excelencia Internacional CeiA3, University of Córdoba, Campus de Rabanales, Marie Curie Building, E-14014 Córdoba, Spain.
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Moalem
D002849:Chromatography, Gas / Q000379:methods; D016002:Discriminant Analysis; D005227:Fatty Acids / Q000032:analysis*; D005504:Food Analysis / Q000379:methods; D016018:Least-Squares Analysis; D031658:Olea / Q000737:chemistry; D000069463:Olive Oil / Q000737:chemistry*; D013030:Spain; D013059:Spectrum Analysis, Raman / Q000379:methods*
D005227:Fatty Acids; D000069463:Olive Oil
Andalusian PDO; Extra virgin olive oil; Geographical Origin; Harvest Year; Olive Variety; Raman spectroscopy