milk quality control

The analysis of non-casein nitrogen (NCN) and non-protein nitrogen (NPN) fractions in milk is essential to the needs of today’s dairy industry. Using VELP solutions, you will get the reliable and reproducible results you need with high-quality performance.

The milk and dairy analysis

The milk and dairy analysis

Dairy products' safety and quality are assured through lab testing efficiency. VELP has developed and evolved our analytical solutions in close contact with our customers to understand their challenges and provide accurate solutions for:

  • Fat determination
  • Nitrogen/Protein determination
  • Casein (Non-casein Nitrogen Determination)
  • Whey proteins
  • Lipids oxidation studies

Milk protein content and Casein

Milk protein content and Casein

Milk proteins are the oldest and most widely consumed food proteins. There is currently a large interest in these substances, both in the nutritional field and in technological applications. Casein proteins are a family of proteins involved in the production of cheese and fermented milk. They are very important nitrogen compounds not only for dairy products production, but they are also additives in medicine, and they have a technical use in cosmetics, paints, and adhesives.

Milk composition

Milk composition

The milk composition is an imperative aspect that influences the quality and the value of dairy products. VELP has a strong track record of Milk and Dairy Nitrogen and protein determination and was asked to support one of the Italian dairy producers in the milk and dairy segment that had an analytical challenge. They needed a solution to analyze the Nitrogen fractions to ensure safety and regulatory compliance quickly, with high precision and reliability.

Nitrogen & NPN values

Nitrogen & NPN values

In the search for the right Nitrogen analyzer, they needed to take into account two important elements:

  • The Nitrogen content of milk represents only a very low percentage of the total and so the instrument needs to be precise and sensitive to detect even the lowest percentage.
  • NPN values vary significantly with the method of sample preparation with TCA acid, so the choice of the method is an element to consider.

Furthermore, the presence of acids is usually a problem for many elemental analyzers in the market.

N/Protein Determination in Cheese

N/Protein Determination in Cheese

Due to the greater demand and consumption of goat/sheep cheese & other dairy products, protein analysis has become more and more important to ensure food safety, food quality, and fairness in international trade. To this end, the modern Kjeldahl analysis method consists of a procedure of catalytically supported mineralization of organic material in a boiling mixture of sulfuric acid and sulfate salt at with digestion block temperature at 400 °C. During the process, the organically bonded nitrogen is converted into ammonium sulfate. Alkalizing the digested solution liberates ammonia which is quantitatively steam distilled and determined by titration.

VELP headquarters germany

Working closely with users

Based on the analytical challenge, the following drivers were identified as working closely with users:

  • Precision and reliability
  • Excellent reproducibility
  • High productivity and non-stop performances
  • Attention to sample preparation and no memory effect

For all these requirements, VELP proposed the Dumas combustion method with NDA Series Dumas Nitrogen Analyzers.

NDA dseries VELP

Precision, reproducibility, and reliability

With NDA Series it’s possible to determine the non-casein nitrogen (NCN) and non-protein nitrogen (NPN) necessary to calculate the nitrogen content in the single fraction of milk. VELP choice of the Dumas method was based on the level of precision and reproducibility of this method compared to others.

VELP NDA 702 Dumas Nitrogen Analyzer

VELP NDA 702 Dumas Nitrogen Analyzer

The NDA Series performs the quantitative analysis of nitrogen by combustion, and despite low sample weights, excellent reproducibility is achieved with a high level of precision and a simple application. Ensures reliable results, with a low relative standard deviation (RSD < 1%), which means high repeatability of the results. Excellent reproducibility is achieved and the data confirm the complete combustion of the sample with no memory effect observed.

VELP analysis software

Main advantages

  • Rapid analysis in 3-4 minutes per sample
  • Precision and reproducibility
  • Low cost per analysis
  • Fast set up of the instrument
  • Intuitive Software user interface
  • Safety

If you have any questions, Geneq professionals are ready to assist:

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