VELP Scientifica, Milan, Italy, have been manufacturing chemistry based analysers for measuring protein, fat and fibre for many years. Their product range includes:

  1. Kjeldahl Digestors and Titrators for Nitrogen and Protein Measurements
  2. Dumas Combustion Analyser for Nitrogen and Protein Measurements
  3. Rapid Soxhlet Extraction Apparatus for Fat Measurement
  4. Digestion and Extraction Apparatus for Raw and Dietry Fibre Measurement

Kjeldahl Analysis

The digester is a widely used instrument in laboratories performing analysis for diversified applications in food&feed, beverage (nitrogen, protein, Total Kjeldahl Nitrogen), environmental (COD, Total Kjeldahl Nitrogen), chemical and pharmaceutical (organic nitrogen) industries, according to a variety of Standards (such as AOAC, ISO, EPA, DIN etc.).


Sample preparation is a crucial part of the analysis and making errors means not obtaining reliable results. With DKL Series manual operations have been reduced: the lowering and the raising of the sample is completely automatic, as the separation between test tubes and suction cap. The operator only has to weigh the sample, introduce it into a test tube, add reagents and catalyst tablets and select the program.

DKL Digesters are available with 8 (x 250 ml), 12 (x 250 / 400 ml), 20 (x 250 ml) and 42 (x 100 ml) positions for a simultaneous, homogeneous and complete digestion. Improve considerably convenience, safety and performance, cutting CO2 emission and energy consumption with TEMS™ technology!

Alternatively VELP continues to supply DK Series, the manual digester available for the simultaneous digestion of 6 (x 250 or 300 ml), 8 (250 ml), 20 (x 250 or 100 ml) and 42 (x 100 ml) test tubes.

VELP's attention to details and your demands characterize the innovations and improvements introduced as our most recent laboratory solutions.

VELP Scientifica introduces its new range of four UDK Series Kjeldahl Distillation Unit with a choice of automation features and designed to meet the most diversified laboratory needs. It is the fourth generation of steam distillation units, showing a continuous improvement and developing of VELP instruments.
Unparalleled technology along with premium materials for high-quality products and extremely reliable results in terms of the quantification of nitrogen and protein in different samples.
It is also the third series of instruments to carry the TEMS technology logo, reflecting the significant investment in design to achieve major advantages concerning environmental protection and economy.

Designed to complement the DKL and DK Digesters and auxiliary equipment, UDK Distillation Units are ideal for Nitrogen analysis by Kjeldahl and other methods according to the established national and international standards.

Dumas Method

The Dumas method is used for the quantitative determination of nitrogen in different substances based on a method of over a century and a half ago. Known also as “Combustion method”, it ensures precise results in few minutes, breaking down the sample into its elemental compounds. Substances produced, such as H2O, O2 and CO2, are trapped, in order to ensure the correct detection of the nitrogen.
It’s an alternative to Kjeldahl method for the determination of nitrogen and protein content in different types of sample.

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Dumas method is the faster official one, validated by different International Organizations, such as AOAC, AACC, ASBC, ISO, IFFO, OIV, etc.

Rapid Soxhlet Extraction


Solvent extraction is used to determine the quantity of various components contained in agricultural, industrial or environmental samples. Soxhlet extraction is one of the most widely used analytical techniques. Adaptations of the technique have been introduced over time in order to reduce lengthy extraction times, for example by increasing the temperature of the solvent used.
The modifications introduced by the American chemist Edward L. Randall are some of the most effective for this purpose. VELP Scientifica solvent extractors operate according to the Randall technique.

Raw Fibre Digestion and Extraction

Vegetables and derived products are made up of substances belonging to different categories:
- carbohydrates, proteins, fats, mineral salts;
- a non-digestible component consisting of polymers (lignin, cellulose, hemicellulose, pectin) called “fiber”.
There are many reasons why it is very important to determine the fiber content:

NUTRITIONAL REASON
The quantity of fiber in the diet of human beings and animals is important in order to maintain the digestive system healthy and functional; too much fiber can cause digestive problems whereas a low fiber intake can cause irregularities in the functioning of the digestive tract.

ECONOMIC REASON
Manufacturers of food and animal feeds use as much fiber as a raw material as they are allowed since it is a low-cost component.

LEGAL REASON
The authorities of almost all countries require manufacturers of packaged foods and animal feeds to declare the fiber content on the packaging as part of the nutritional table.

Dietry Fibre Digestion and Extraction

The dietary fiber determination is carried out on foods intended for human nourishment.
AOAC (Official Methods of Analysis) proposes enzymatic method 985.29 for determining dietary fiber by way of digestion with thermostable enzymes in foods and animal feeds.
VELP Scientifica developed the GDE and CSF6 units in conformity with this method.






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