PT - JOURNAL ARTICLE AU - Renata Ristic AU - Daniel Cozzolino AU - David W. Jeffery AU - Joanna M. Gambetta AU - Susan E. P. Bastian TI - Prediction of Phenolic Composition of Shiraz Wines Using Attenuated Total Reflectance Mid-Infrared (ATR-MIR) Spectroscopy AID - 10.5344/ajev.2016.16030 DP - 2016 Oct 01 TA - American Journal of Enology and Viticulture PG - 460--465 VI - 67 IP - 4 4099 - http://www.ajevonline.org/content/67/4/460.short 4100 - http://www.ajevonline.org/content/67/4/460.full SO - Am J Enol Vitic.2016 Oct 01; 67 AB - Phenolic compounds play a critical role in determining red wine color, taste, flavor, and mouthfeel sensory attributes. Additionally, they contribute to wine aging and provide wine stability. This study evaluated the use of an attenuated total reflection (ATR) mid-infrared (MIR) spectroscopy to measure phenolic compounds in Shiraz wine samples of different quality levels obtained from 24 Australian wine geographical indications. Partial least squares (PLS) regression using the second derivative of the whole MIR spectrum produced the coefficient of determination (R2) in calibration and standard error in cross-validation (SECV) for different attributes. In particular, SO2-resistant pigments had R2 = 0.58 (SECV=0.58 au), total anthocyanins had R2 = 0.61 (SECV=32 mg/L), wine color density had R2 = 0.51 (SECV=0.56 au), and total phenolics had R2 = 0.60 (SECV=5.7 au). These results demonstrated the potential use of ATR-MIR spectroscopy with PLS regression as a rapid method to measure important parameters related to red wine phenolic composition and wine quality.