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Journal of Automated Methods and Management in Chemistry
Volume 2006, Article ID 45102, 5 pages
http://dx.doi.org/10.1155/JAMMC/2006/45102

Quantitative Analysis of Alcohol, Sugar, and Tartaric Acid in Alcoholic Beverages Using Attenuated Total Reflectance Spectroscopy

1Optical Radiation Standards, National Physical Laboratory, K. S. Krishnan Road, New Delhi 110012, India
2Department of Chemistry, Dyal Singh College, University of Delhi, Lodi Road, New Delhi 110 003, India
3Department of Physics and Astrophysics, University of Delhi, Delhi 110 007, India

Received 26 October 2005; Revised 19 December 2005; Accepted 18 January 2006

Copyright © 2006 R. Nagarajan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Mid-infrared (MIR) spectroscopy in attenuated total reflectance (ATR) mode was used for quantifying ethanol, sucrose, and tartaric acid in alcoholic beverages. One hundred synthetic samples were prepared with different ethanol, sucrose, and tartaric acid concentrations. Experiments were carried out on Bio-Rad 175 C FTS using an ATR accessory. Spectra were recorded in the wavelength region 600–4000 cm1. Calibration was performed using partial least squares (PLS) algorithm. Commercially available alcoholic beverages (gin, rum, vodka, etc.) were experimented and concentration of ethanol in these samples was predicted using the developed calibration model. Chemical analysis of these commercial samples was carried out in order to compare the results. The agreement between ATR results with those of chemical analysis revealed good reliability and repeatability of the technique used.