Evaluation of quantitative nuclear magnetic resonance spectroscopy for the determination of ethanol in alcoholic beverages
LE3 .A278 2022
Bachelor of Science
Quantitative nuclear magnetic resonance (qNMR) spectroscopy was evaluated for the determination of ethanol content in alcoholic beverages, with an emphasis on cream-based beverages. Analysis of cream-based beverages is time-consuming and inefficient using conventional methods, therefore qNMR was investigated for its potential as a rapid, cost-effective alternative. Three calibration strategies were compared for interpreting the quantitative results: external calibration, the internal standard method, and an internal reference method. A wide variety of commercially available beverages were tested. The results obtained by qNMR were compared with those obtained by standard methods (distillation and oxidation with dichromate for cream-based liqueurs and density for other samples) The internal reference method yielded a recovery range of 87.0 – 119%. The relative standard deviation 4.6% for ethanol concentration in the cream-based liqueurs was 4.6%. Therefore, it was concluded that the internal reference method was the most accurate and precise and shows promise of being utilized in beverage laboratories for the determination of ethanol.
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