title: Three-way partial least-squares/residual bilinearization study of second-order lanthanide-sensitized luminescence excitation-time decay data: analysis of benzoic acid in beverage samples.
abstract: Lanthanide-sensitized luminescence excitation-time decay matrices were employed for achieving the second-order advantage using as chemometric algorithms parallel factor analysis (PARAFAC) and multidimensional partial least-squares with residual bilinearization (N-PLS/RBL). The second-order data were measured for a calibration set of samples containing the analyte benzoic acid in the concentration range from 0.00 to 5.00 mg L(-1), for a validation set containing the analyte and the potential interferent saccharin (in the range 0.00-6.00 mg L(-1)), and for real samples of beverages containing benzoic acid as preservant, saccharin, and other potentially interfering compounds. All samples were treated with terbium(III), trioctylphosphine oxide as a synergistic ligand, and contained a suitable imidazol buffer, in order to ensure maximum intensity of the luminescence signals. The results indicate a slightly better predictive ability of the newly introduced N-PLS/RBL procedure over standard PARAFAC, both in what concerns the comparison with nominal analyte concentrations in the validation sample set and with results provided by the reference high-performance liquid chromatographic technique for the real sample set.
authors.affiliation: Departamento de Química Analítica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, and Instituto de Química Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas, Suipacha 531, Rosario S2002LRK, Argentina.
authors.forename: Valeria A
authors.initials: VA
authors.lastname: Lozano
authors.forename: Gabriela A
authors.initials: GA
authors.lastname: Ibañez
authors.forename: Alejandro C
authors.initials: AC
authors.lastname: Olivieri
mesh_terms: D000465:Algorithms; D019817:Benzoic Acid / Q000737:chemistry*; D001628:Beverages / Q000032:analysis*; D002138:Calibration; D002851:Chromatography, High Pressure Liquid; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D016018:Least-Squares Analysis; D049449:Luminescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D028581:Lanthanoid Series Elements; D019817:Benzoic Acid