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
Improved automatic steam distillation for determining alcoholic strength in spirits and liqueurs
Steam distillation with oscillation-type densimetry for alcohol strength determination
Dirk W. Lachenmeier, Leander Plato, Manuela Suessmann, Matthew Di Carmine, Bjoern Krueger, Armin Kukuck, Markus KranzThe 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.
Facts, background information, dossiers
- alcohol determination
- steam distillation
- rapid steam distill…
- distillation systems
- distillation
- ethanol
More about C. Gerhardt
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White papers
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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Products
Premium Kjeldahl Steam Distillation Systems
VAPODEST is currently the most modern and powerful analysis system on the market for nitrogen analysis using the Kjeldahl method more
Best in Class for Kjeldahl Digestion
KJELDATHERM digestion units are automated block digestion systems which deliver reproducible digestion conditions more
Easily Determine the N Content of Solid and Liquid Samples in Just 3 Minutes Using 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
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Videos
Premium Kjeldahl Steam Distillation Systems
A high degree of precision and universality make the Kjeldahl method the world’s leading standard method for determining the nitrogen content in food and feedstuffs as well as in soil and water samples. This versatile method is also found in the general or pharmaceutical industries, or wher ... more
Easily Determine the N Content of Solid and Liquid Samples in Just 3 Minutes Using the Dumas Method
DUMATHERM® technology has established itself as a key component of food and animal feed laboratories. The sturdy, powerful DUMATHERM analytics system provides valid reference results cleanly, quickly and steadily. And it can do so in almost any location with the appropriate gas infrastructu ... more
Automatic Fibre Extraction for Feed Analysis
The usability of animal feed and its impact on animal health depend in large part on the proportions of the different fibre fractions that it contains. In the field of biogas production, the fibre fractions of substrates in fermenters are determined in order to distinguish the carbohydrates ... more
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