The Kjeldahl nitrogen analyzer is a specialized analytical instrument designed to determine protein content by measuring the nitrogen content in a sample—a method based on the principle that the nitrogen content within proteins remains constant. It is also referred to as nitrogen analyzer, protein analyzer, or crude protein analyzer.

Based on the field of application, samples commonly analyzed with the Kjeldahl analyzer can be categorized as follows:

1. Animal feed – including compound feed, concentrated feed, pet food, soybean meal, rapeseed meal, fish meal, corn, and forage; analyzed for crude protein.

2. Food products – including meat, eggs, grains/cereals, legumes, nuts, starch, beverages, and condiments; analyzed for protein content.

3. Milk and dairy products – including fresh milk, whole milk, yogurt, milk powder, and whey powder; analyzed for protein content.

4. Grains and oils – including soybeans, peanuts, and cereal grains; analyzed for protein content.

5. Fertilizers

6. Soil

7. Others – some plant samples, biological products, and chemical substances can also be analyzed, though parameters must be set individually based on the characteristics of the matrix.

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