Morgano M. A., de Faria C. G., Ferrão M. F., Ferreira M. M. C., "DETERMINAÇÃO DE AÇÚCAR TOTAL EM CAFÉ CRU POR ESPECTROSCOPIA NO INFRAVERMELHO PRÓXIMO E REGRESSÃO POR MÍNIMOS QUADRADOS PARCIAIS" ["DETERMINATION OF TOTAL SUGAR IN RAW COFFEE USING NEAR INFRARED SPECTROSCOPY AND PLS REGRESSION"], Quim. Nova, 30(2), 346-350 (Mar-Apr 2007).
[Article]
 

Abstract.
In this work a fast method for the determination of the total sugar leverls in samples of raw coffee was developed using the near infrared spectroscopy technique and multivariate regression. The sugar levels were initially obtained using gravimetry as the reference method. Later on, the regression models were built from the near infrared spectra of the coffee samples. The original spectra were pre-treated according to the Kubelka-Munk transformation and multiplicative signal correction. The proposed analytical method made possible to direct determination of the total sugar levels in the samples with an error by 8% with respect to the conventional methodology.

Keywords.
Total Sugar; Raw Coffee; Near Infrared Spectroscopy.

Keywords Plus.