Applications
Download Kjeldahl Applications
Take advantage of the application database!
The Büchi Kjeldahl application database lists more than 100 Kjeldahl and Non-Kjeldahl applications using dedicated Büchi equipment. The abstract of the latest applications can be downloaded directly. Comprehensive documentation is available free of charge after signing in. Just refer to the corresponding application order code in the left column of the following overview:
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buchi_kjeldahl_applications_2013.xlsx Kjeldahl applications database |
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Kjeldahl Applications
The Kjeldahl method for the determination of organic nitrogen is the worldwide standard for analyzing the protein content in food, beverages and animal feed. Additionally, Kjeldahl has been adapted to serve as the standard method of nitrogen analysis in environmental applications and the pharmaceutical, agricultural and chemical industries.
Buchi offers Kjeldahl instrumentation for the entire analytical process, from sample preparation (Mixer B-400) and digestion (SpeedDigester K-425, K-436 and K-439, Digest System K-437,
Digest Automat K-438 and K-432) to distillation (Distillation Unit K-350, K-355) and analytical determination (KjelFlex K-360, Auto Kjeldahl Unit K-370, Kjeldahl Sampler K-371).
Our global competence centers all over the world are an integral part of our after-sales support service. Our experienced application chemists will gladly assist you wherever you might need help. Get in touch with us or with our local distributor if you need one of the above mentioned application notes.
Protein determination in Food&Feed
Feed industry
Protein in feed or feed ingredients
(sunflower, rape seed, corn, barley wheat...)
Food and beverages
Protein in:
- milk
- meat
- flour
- pasta
- beer
- cookies
- sausage
- .......
Non Kjeldahl applications
The use of steam distillation as a separation process is a proven and cost-effective method utilized in many areas of quality control in food production, animal feed manufacture and environmental analysis.
Beverages
alcohol content, SO2, volatile acids in wine
Food industry
TVBN in fish, shrimps and fish meal, SO2 in dried fruits
Environmental applications
Cyanides, volatile acids, phenol index and COD in water and sludge
Agricultural laboratories
- ammonia
- nitrate/nitrite
- Total Kjeldahl Nitrogen (TKN)
- devarda
Pharmaceutical and chemical industry
Organic Nitrogen
In the chemical and pharmaceutical industry
Environmental applications
Water, sludge, waste water, soil
- ammonia
- Total Kjeldahl Nitrogen (TKN)
- phenol
- Chemical Oxygen Demand (COD)
- cyanide
- devarda