KJELDAHL DIGESTION TUBES

Kjeldahl Digestion Tubes

Kjeldahl digestion tubes are essential components in the quantitative determination of nitrogen and proteins—one of the most important analyses in analytical chemistry, food, feed, environmental, and pharmaceutical laboratories.

At Pobel, we offer high thermal and mechanical resistance Kjeldahl tubes, manufactured under strict quality controls to ensure reliable performance during the digestion stage of the method. Our product range is designed to fit various automated and manual systems, delivering precise results in demanding laboratory environments.

Key Components for Accurate Analysis

The Kjeldahl method involves heating organic samples at high temperatures in the presence of sulfuric acid and catalysts. This requires tubes that can withstand extreme conditions without warping, breaking, or contaminating the sample.

Pobel’s Kjeldahl digestion tubes meet these technical specifications:

• Made of high thermal resistance borosilicate glass

• Uniform walls and rounded bottoms for complete digestion

• Compatible with standard and automated Kjeldahl digestion units

• Available in different diameters and volumes (100 ml, 250 ml, 400 ml, etc.)

Main Applications of the Kjeldahl Method

Kjeldahl tubes enable this method to be used across multiple sectors:

• Food industry: protein determination in meat, dairy, cereals, flour, and more

• Feed quality control and animal nutrition

• Environmental analysis: total nitrogen quantification in wastewater and soils

• Pharmaceutical and chemical industries: evaluation of nitrogen-containing compounds

Our tubes are built to operate in conventional or automated digestion systems, ensuring compatibility with well-known industry brands.

Technical Features of Our Kjeldahl Digestion Tubes

• High thermal resistance: withstands temperatures up to 450 °C without deformation or breakage

• Chemical compatibility: stable against sulfuric acid and catalytic reagent mixtures

• Uniform volume and optional graduations: ensures reproducible conditions and consistent results

• Easy to clean and reuse: smooth surface prevents residue buildup and simplifies decontamination

Advantages of Buying Kjeldahl Tubes from Pobel

✔️ Certified products tested in demanding analytical environments
✔️ Availability of standard and specific models for different digestion types
✔️ Competitive pricing
✔️ Technical advice for integration with your existing equipment

At Pobel, we understand the importance of reliability in analytical testing. That’s why our Kjeldahl digestion tubes are designed to provide maximum safety, repeatability, and operational efficiency.

Usage and Maintenance Recommendations

• Verify tube compatibility with your equipment’s block heater or rack

• Handle using tongs or thermal holders to prevent accidents

• Clean with lab-grade detergents after each use and rinse with distilled water

• Regularly inspect the tube for cracks or wear that could compromise analytical safety

Personalized Support

Visit our online store and choose the Kjeldahl tubes that best fit your lab’s needs. Contact us for a quote, or if you need help determining which product would be most suitable for your requirements.

Frequently Asked Questions

What does a Kjeldahl digester do?
A Kjeldahl-type apparatus is used to determine nitrogen and protein content in laboratory analysis for quality control, research, and education. It includes both digestion and distillation systems.

What is a Kjeldahl flask used for?
The Kjeldahl flask is used to determine alcohol content by steam distillation of samples such as wine, beer, and spirits.