Abstract
Near-infrared (NIR) spectroscopy has become a very popular technique for thenon-invasive assessment of intact fruit. This work presents an application ofa low-cost commercially available NIR spectrometer for the estimationof ripeness of Chilean wine grapes. Two configurations for the spectraacquisition were used (diffuse transmittance and interactance), using acustom-designed contact probe. Samples of Chardonnay, Carménère andCabernet Sauvignon, collected over the 2002 harvest and pre-harvest seasons,were analysed for total soluble solids content (°Brix).Partial least squares calibration models, obtained from several preprocessingtechniques (smoothing, multiplicative signal correction, standard normal variate,etc), were compared. Also, two spectral regions were used, one without the redpart of the visible spectrum (just the short-wave (SW–NIR) region) and the otherincluding it. Performance of different models was assessed in terms of root meansquare of cross-validation, root mean square of prediction (RMSEP) andR2for a validation set of samples. RMSEPs of 1.06 with R2 = 0.942indicate that it is possible to estimate wine grape ripeness (°Brixvalue), by using a CCD portable spectrometer. The red grape models performedbetter than the white grape models.
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