INVESTIGADORES
GOICOECHEA Hector Casimiro
artículos
Título:
Chemometric assisted simultaneous spectrophotometric determination of four-component nasal solutions with a reduced number of calibration samples
Autor/es:
GOICOECHEA, HÉCTOR C; AC OLIVIERI,
Revista:
ANALYTICA CHIMICA ACTA
Editorial:
Elsevier
Referencias:
Año: 2002 vol. 453 p. 289 - 300
ISSN:
0003-2670
Resumen:
The use of multivariate spectrophotometric calibration for the simultaneous determination of three active components and
one excipient in nasal solutions is presented. The resolution of four-component mixtures of phenylephrine, diphenhydramine,
naphazoline and methylparaben in a matrix of excipients has been accomplished by using partial least-squares (PLS-1) and a
variant of the so-called hybrid linear analysis (HLA) named net analyte preprocessing (NAP). Notwithstanding the presence of
a large number of components and their high degree of spectral overlap, they have been rapidly and simultaneously determined
with high accuracy and precision, with no interference, and without resorting to extraction procedures using non-aqueous
solvents. A simple and fast method for wavelength selection in the calibration step is used, based on the minimisation of the
predicted error sum of squares (PRESS) calculated as a function of a moving spectral window. The use of calibration designs
of reduced size has been attempted. Satisfactory results were obtained when the number of calibration samples was reduced
from 25 (full central composite) to 17 (fractional central composite) using the net analyte-based NAPmethod.