PT  - JOURNAL ARTICLE
AU  - Andrea Versari
AU  - Giuseppina P. Parpinello
AU  - Alessia U. Mattioli
AU  - Sergio Galassi
TI  - Determination of Grape Quality at Harvest Using Fourier-Transform Mid-Infrared Spectroscopy and Multivariate Analysis
AID  - 10.5344/ajev.2008.59.3.317
DP  - 2008 Sep 01
TA  - American Journal of Enology and Viticulture
PG  - 317--322
VI  - 59
IP  - 3
4099  - http://www.ajevonline.org/content/59/3/317.short
4100  - http://www.ajevonline.org/content/59/3/317.full
SO  - Am J Enol Vitic.2008 Sep 01; 59
AB  - A rapid method for the simultaneous measurement of gluconic acid and glycerol, two important chemical markers of grape infection, was developed using Fourier-transform mid-infrared (FT-MIR) spectroscopy. The method used a combination of FT-MIR with partial-least squares (PLS) regression and compositional data of Trebbiano and Sangiovese grapes obtained with high performance ion-exchange chromatography (HPLC). A total of 320 grape samples were analyzed, including grapes hand picked in the vineyards (200 samples) and mechanically sampled from trucks upon arrival at the wineries (120 samples). Gluconic acid and glycerol increased with increasing percentage of grape infection assessed by visual inspection (r = 0.928). The best result was obtained for gluconic acid (R2 = 0.979; RMSECV = 0.63; RPD = 7.0), indicating that FT-MIR was suitable for process control.