Application of Mid-infrared Spectroscopy for the Measurement of Several Quality Parameters of Alcoholic Beverages, Wine and Raki

Abstract

Mid-infrared (IR) spectroscopy, which is a rapid and relatively small amount of waste producing technique, was used to predict several quality parameters of two types of alcoholic beverages, wine and raki. Mid-infrared spectra of red, rose and white wines and a traditional aniseed alcoholic beverage, raki were collected and relations were established between measured chemical parameters (pH, brix, total phenol content, anthocyanin content, titratable acidity, sugar content, electrical conductivity and some colour parameters) of these beverages and their infrared spectra using chemometric techniques. Partial least square regression provided excellent prediction of total phenol (R 2 00.97) and anthocyanin contents (R 2 00.98) of wine samples and a good prediction of pH (R 2 00.9), brix (R 2 00.92) and colour intensity (R 2 00.93) values were obtained. Brix, total phenol and sugar content of raki samples were also estimated very successfully (R 2 00.99) for raki and good prediction was obtained with pH value. Mid-IR spectroscopy in combination with chemometrics could be a promising technique for determination of several quality parameters of alcoholic beverages simultaneously and rapidly.

Monitoring of fermentation process parameters of Chinese rice wine using attenuated total reflectance mid-infrared spectroscopy

“…PLS analysis was performed by relating FT-MIR spectral data as X variables and chemical components contents obtained with analytical methods as Y variables (Ozturk et al, 2012). As shown in Table 3, the correlation coefficients of calibration (R 2 (cal)), root mean square error of cross-validation (RMSECV (%)) and the residual predictive deviation (RPD) were of 0.95, 4.60 and 9.48 for ethanol and 0.93, 4.65 and 6.54 for total acid, respectively.…”

Application of FT-NIR spectroscopy and FT-IR spectroscopy to Chinese rice wine for rapid determination of fermentation process parameters

“…The detailed calculations of these indices can be referenced to Ozturk et al 18 Additionally, residual predictive deviation (RPD), which is dened as the ratio of standard deviation (SD) of the prediction set to the RMSEP, 19,20 was also used in this study to standardize the predictive accuracy. Correlation coefficient of the calibration set (R 2 (cal)) and the root mean square error of cross-validation (RMSECV) were used to evaluate the model t to the data in the calibration set.…”

FTIR analysis of ash in wine

“…Even in the latest review article [4] conductivity of wine is mentioned only once with the reference on the paper from 2004 [3]. We were able to find only one other paper dealing with the conductivity of wine, but even they report it only for spirit drink and not wine, and concluding FTIR data did not provide a good prediction for electrical conductivity [5].…”