Determinação simultanea e não-destrutiva de solidos totais e soluveis, licopeno e beta-caroteno em produtos de tomate por espectroscopia no infravermelho proximo utilizando calibração multivariada

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

SIMULTANEOUS AND NON-DESTRUCTIVE DETERMINATION OF TOTAL AND SOLUBLE SOLIDS, LYCOPENE AND BETA-CAROTENE IN TOMATO PRODUCTS BY NEAR INFRARED SPECTROSCOPY AND MULTIVARIATE CALIBRATION brings the development of calibration models by using chemometrical techniques of rnultivariate data regression. The sirnultaneous and non-destructive determination of important parameters in tomato products, like lycopene, beta-carotene and total and soluble solids, was accomplished by using the Near-Infrared (NIR) Spectroscopy technique and the PCR and PLS calibration algorithms. Reference rnethods were oven drying for total solids, refractometry for soluble solids and HPLC for the carotenoids. For the construction of optimal calibration models, four variable selection techniques were applied: the Successive Projections Algorithm (SPA), the Dimension-Wise Selection (DWS), the selection by the correlograms and the symmetrical spectra division. A total of 64 models were built, by which it could be concluded that the best pre-processing method was the average smoothing or the Multiplicative Signal Correction (MSC). The most effective regression rnethod was the PLS, whilst the variable selection by symmetrical spectra division gave the best models. The final models obtained present predictive abilities that have similar deviations of those of the reference rnethods and, thus, can be broadly used in the food industry.

ASSUNTO(S)

carotenoides pls spa quimiometria

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