Autor segons l'article: Whei Miaw, Carolina Sheng; Sena, Marcelo Martins; Carvalho de Souza, Scheilla Vitorino; Ruisanchez, Itziar; Pilar Callao, Maria
Departament: Química Analítica i Química Orgànica
Autor/s de la URV: Callao Lasmarias, María Pilar / Ruisánchez Capelastegui, María Iciar
Paraules clau: Vitis Variable selection Statistics as topic Simca Pls-da Plant nectar Multivariate analysis Multi-class methods Least-squares analysis Grape nectar Fraud Food fraud Food analysis Discriminant analysis simca pls-da multi-class methods grape nectar food fraud
Resum: During the quality inspection control of fruit beverages, some types of adulterations can be detected, such as the addition or substitution with less expensive fruits. To determine whether grape nectars were adulterated by substitution with apple or cashew juice or by a mixture of both, a methodology based on attenuated total reflectance Fourier transform mid infrared spectroscopy (ATR-FTIR) and multivariate classification methods was proposed. Partial least squares discriminant analysis (PLS-DA) and soft independent modeling of class analogy (SIMCA) models were developed as multi-class methods (classes unadulterated, adulterated with cashew and adulterated with apple) with the full-spectra. PLS-DA presented better performance parameters than SIMCA in the classification of samples with just one adulterant, while poor results were achieved for samples with blends of two adulterants when using both classification methods. Three variable selection methods were tested in order to improve the effectiveness of the classification models: interval partial least squares (iPLS), variable importance in projection scores (VIP scores) and a genetic algorithm (GA). Variable selection methods improved the performance parameters for the SIMCA and PLS-DA methods when they were used to predict samples with only one adulterant. Only PLS-DA coupled with iPLS was able to classify samples with blends of two adulterants, providing sensitivity values between 100% and 83% at 100% specificity for the three studied classes.
Àrees temàtiques: Zootecnia / recursos pesqueiros Spectroscopy Saúde coletiva Química Nutrição Medicina veterinaria Medicina iii Medicina ii Medicina i Materiais Interdisciplinar Geociências General medicine General chemistry Farmacia Ensino Engenharias iv Engenharias iii Engenharias ii Engenharias i Ciências biológicas iii Ciências biológicas ii Ciências biológicas i Ciências ambientais Ciências agrárias i Ciência de alimentos Chemistry, analytical Chemistry (miscellaneous) Biotecnología Biodiversidade Biochemistry Astronomia / física Analytical chemistry Administração pública e de empresas, ciências contábeis e turismo
ISSN: 00399140
Adreça de correu electrònic de l'autor: mariapilar.callao@urv.cat itziar.ruisanchez@urv.cat
Identificador de l'autor: 0000-0003-2691-329X 0000-0002-7097-3583
Data d'alta del registre: 2024-10-12
Versió de l'article dipositat: info:eu-repo/semantics/acceptedVersion
Enllaç font original: https://www.sciencedirect.com/science/article/abs/pii/S0039914018307859
URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
Referència a l'article segons font original: Talanta. 190 55-61
Referència de l'ítem segons les normes APA: Whei Miaw, Carolina Sheng; Sena, Marcelo Martins; Carvalho de Souza, Scheilla Vitorino; Ruisanchez, Itziar; Pilar Callao, Maria (2018). Variable selection for multivariate classification aiming to detect individual adulterants and their blends in grape nectars. Talanta, 190(), 55-61. DOI: 10.1016/j.talanta.2018.07.078
DOI de l'article: 10.1016/j.talanta.2018.07.078
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2018
Tipus de publicació: Journal Publications