APPLICATION OF MULTIVARIATE CALIBRATION TO THE SIMULTANEOUS ROUTINE DETERMINATION OF ETHANOL, GLYCEROL, FRUCTOSE, GLUCOSE AND TOTAL RESIDUAL SUGARS IN BOTRYTIZED-GRAPE SWEET WINES BY MEANS OF NEAR-INFRARED REFLECTANCE SPECTROSCOPY
Cm. Garciajares et B. Medina, APPLICATION OF MULTIVARIATE CALIBRATION TO THE SIMULTANEOUS ROUTINE DETERMINATION OF ETHANOL, GLYCEROL, FRUCTOSE, GLUCOSE AND TOTAL RESIDUAL SUGARS IN BOTRYTIZED-GRAPE SWEET WINES BY MEANS OF NEAR-INFRARED REFLECTANCE SPECTROSCOPY, Fresenius' journal of analytical chemistry, 357(1), 1997, pp. 86-91
The simultaneous determination of ethanol, glycerol, fructose, glucose
and residual sugars in botrytized-grape sweet white wines was perform
ed by means of near-infrared reflectance using 19 interference filters
and a partial least squares (PLS) model in latent variables as a mult
ivariate calibration technique. The results were compared with those o
btained using other multivariate calibration techniques, such as MLR,
SWR and PCR, by means of a validation set of samples with known compos
itions. Ethanol, fructose and residual sugars were well predicted by a
ll the multivariate techniques. Glycerol and glucose showed the highes
t prediction residuals. The technique may be of practical interest in
the routine analysis of these types of wines with low cost in terms of
samples, time and personnel.