Chemical Analysis of Suspected Unrecorded Alcoholic Beverages from the States of São Paulo and Minas Gerais, Brazil

Figure 1

IR spectrum of a sample of Brazilian cachaça showing the main bands: at 3341–2906 cm⁻¹ attributed to O–H stretching of alcohols, water, carboxylic acids, and amides; at 2145 cm⁻¹ attributed to the asymmetric vibration of NCO⁻ in cyanate-copper complexes; at 1659–1651 cm⁻¹ attributed to CO stretching vibrations conjugated with double bonds (C=C) adjacent to a carbonyl group; at 1086 and 1046 cm⁻¹ attributed to stretching vibrations of hydrogen-bonded C–OH alcoholic groups.