Fig. 6. Evolution of alcohol strength and titratable acidity in one fermentation run of apple wine at 20 C with S. cerevisiae PF12, the predicted versus measured values of alcohol strength (R2¼ 0.962, RMSEP ¼ 3.6 mL/L), and titratable acidity (R2
¼ 0.972, RMSEP ¼ 0.22 g/L) using the FT-NIRS models to monitor the fermentation process.