Determination of the Level of Alcohol in Ethiopian Common Alcoholic Beverages using Spectroscopic Techniques
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Date
2013-06
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Addis Ababa University
Abstract
A method for the direct determination of ethanol and methanol from Ethiopian distilled
alcoholic beverages, Arekes, using FT-MIR and UV -NIR in the range 1180~950 em'] and
1 72 0~1660 nm respectively, were developed, In addition, in the region 3020-2950 em']
for fermented alcoholic beverages Tella and Tej ethanol determination were developed
and validated, The results obtained were in excellent agreement with the results obtained
from Gas Chromatographic measurements, The limit of detection of ethanol and
methanol for distilled alcoholic beverages using FT-MIR and UV-NIR methods were
0,025 and 0,007 and 0,019 and 0,038% (v/v), respectively, For fermented alcoholic
beverages, Tella and Tej, the limit of detection of ethanol was 0,08% (v/v), The recovery
obtained for ethanol using FT-MIR and UV-NIR ranges from 99-102 and 98-105% (v/v),
respectively, for distilled alcoholic beverages and 99 - 103 and 101 - 102% (v/v) for Tella
and Tej, respectively, The average ethanol level found in traditional Ethiopian alcoholic
beverages, Arekes, Tella and Tej were 31.6 ~ 51.4, 1.94 -5,65 and 6,79 - 9,36% (v/v)
respectively, In all samples methanol was not detected,
Key words: Ethanol; Methanol; Areke; Tella, Tej; FT-MIR and UV-NIR
Spectrophotometers
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Keywords
Ethanol, Methanol, Areke, Tella, Tej, FT-MIR and UV-NIR Spectrophotometers