The determination of the alcoholic strength in spirits and liqueurs is required to control the labelling of alcoholic beverages. The reference methodology prescribes a distillation step followed by densimetric measurement. The classic distillation using a Vigreux rectifying column and a West condenser is time consuming and error-prone, especially for liqueurs that may have problems with entrainment and charring. For this reason, this methodology suggests the use of an automated steam distillation device as alternative. The novel instrument comprises an increased steam power, a redesigned geometry of the condenser and a larger cooling coil with controllable flow, compared to previously available devices. Method optimization applying D-optimal and central composite designs showed significant influence of sample volume, distillation time and coolant flow, while other investigated parameters such as steam power, receiver volume, or the use of pipettes or flasks for sample measurement did not significantly influence the results. The method validation was conducted using the following settings: steam power 70 %, sample volume 25 mL transferred using pipettes, receiver volume 50 mL, coolant flow 7 L/min, and distillation time as long as possible just below the calibration mark.
Improved automatic steam distillation for determining alcoholic strength in spirits and liqueurs
Steam distillation with oscillation-type densimetry for alcohol strength determination
- alcohol determination
- steam distillation
- rapid steam distill…
- distillation systems
- distillation
- ethanol
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White papers
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Starch products only contain very low concentrations of proteins. For analysis, the Dumas combustion method has established itself as second reference method more
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Improved automatic steam distillation for determining alcoholic strength in spirits and liqueurs
Excellent alternative for sample cleanup of volatiles from complex matrices. Major advantages are the low costs for consumables per analysis more
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Products
Automatic Steam Distillation for Kjeldahl Analysis
With VAPODEST you distill your samples for the determination of nitrogen, cyanide, SO2, ammonia, phenol, sorbic acid or alcohol safely and quickly more
Kjeldahl block digestion in high throughput can be so simple and convenient
KJELDATHERM digestion units are automated block digestion systems which deliver reproducible digestion conditions more
Nitrogen determination according to Dumas
Available with a unique manual sample loader or an autosampler for up to 120 samples DUMATHERM performs according to international standards and regulations more
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Videos
Automatic Steam Distillation for Kjeldahl Analysis
Nitrogen determination according to Kjeldahl is recognized the world over as a reference method, so optimal sample preparation is a must. VAPODEST® lets you distill safely and quickly not only samples for the determination of nitrogen according to Kjeldahl, but also of cyanide, SO2, ammonia ... more
Nitrogen determination according to Dumas
If you have to determine the protein content of many samples every day, the DUMATHERM® nitrogen analyzer will excite you. Unlike the Kjeldahl method, the instrument works without aggressive chemicals and therefore does not require valuable space in the fume cupboard. The DUMATHERM® also use ... more
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