INVESTIGADORES
GOICOECHEA Hector Casimiro
artículos
Título:
High-performance organized media-enhanced spectrofluorimetric determination of pirimiphos-methyl in maize
Autor/es:
MONTEMURRO, MILAGROS; BRASCA, ROMINA; CULZONI, MARÍA J.; GOICOECHEA, HÉCTOR C.
Revista:
FOOD CHEMISTRY
Editorial:
ELSEVIER SCI LTD
Referencias:
Año: 2019 vol. 278 p. 711 - 719
ISSN:
0308-8146
Resumen:
A novel method for the determination of pirimiphos-methyl (PMM) in maize grains by fluorescencespectroscopy and three-way calibration was developed. The formation of supramolecular complexes andtheir effect on the luminescence properties of PPM were studied. A solvent extraction step followed bysolid phase extraction for sample clean-up was optimized. A chemometric approach consisting inPARAFAC as second-order data processing tool and piecewise direct standardization (PDS) for reducingthe complexity of the calibration process was developed to overcome the matrix effect. This strategyallowed dealing with the matrix effect while reducing the number of samples to be processed and,consequently, the solvent consumption and the total analysis time. Finally, three-way calibration wasapplied to predict the PMM concentration in unknown samples. The mean recovery was 115 % and thelimits of detection and quantitation were in the order of the parts per trillion, i.e. 6 and 20 ng g-1,respectively.
