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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Nitrogen / Protein Analysis for Starch
Starch products only contain very low concentrations of proteins. For analysis, the Dumas combustion method has established itself as second reference method more
Are Macro Sample Weights at Macro Costs Still Viable Today?
Cost efficiency and the conservation of resources are very often a contradiction. The protein/nitrogen analysis system DUMATHERM brings both demands together more
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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Nitrogen determination with the Dumas method
Available with a unique manual sample loader or an autosampler for up to 120 samples DUMATHERM performs according to international standards and regulations more
Automatic Fibre Extraction for Feed Analysis
Determining the fibre fraction in feed is time-consuming and laborious. C. Gerhardt developed FIBRETHERM to solve this problem more
Fully automatic acid hydrolysis in 90 min.
80% less work for laboratory staff ✓ Closed system - maximum safety and no space required in the fume hood ✓ Work according to the reference method - Validated and reproducible more
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Nitrogen determination with the Dumas method
If you have to determine the protein content of many samples every day, you will be delighted with the DUMATHERM nitrogen analyser. In comparison to the Kjeldahl method, the device works without aggressive chemicals and therefore does not require valuable space in the fume hood. Determine t ... more
Automatic Fibre Extraction for Feed Analysis
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Fully automatic acid hydrolysis in 90 min.
The time-consuming fat determination according to Weibull-Stoldt is one of the standard quality control procedures in the food industry. Reduce your laboratory staff's attendance time by up to 80% and get to know the only fully automatic hydrolysis system for classical fat determination wor ... more
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