​The Role of Kjeldahl Nitrogen Analyzer in Cosmetics Testing

​The Role of Kjeldahl Nitrogen Analyzer in Cosmetics Testing


Kjeldahl nitrogen analyzer is an instrument that calculates the protein content by measuring the nitrogen content in the sample based on the principle of constant nitrogen content in protein. The method it uses to measure and calculate protein content is called Kjeldahl method, so it is named Kjeldahl nitrogen analyzer, also known as nitrogen analyzer, protein analyzer, and crude protein analyzer.


Antiseptic in cosmetics refers to preventing or inhibiting the growth of microorganisms in order to meet the requirements of hygienic regulations. If there is no preservative, once the pathogenic bacteria appear, it will not only affect the appearance and smell, but also cause the user to be infected. Preservatives are safe within the legal concentration. How to ensure the content of restricted preservatives in cosmetics? Kjeldahl method can be used.


The Kjeldahl method was established by the Danish chemist Kedal in 1833. It has now been developed into constant, trace, and flat trace Kjeldahl methods and automatic nitrogen analyzer method, which is commonly used to analyze the nitrogen content of organic compounds. In addition to detecting preservatives in cosmetics, Kjeldahl nitrogen analyzer can also detect various nitrogen, crude protein, and true protein content in grain, food, dairy products, beverages, feed, soil, water, drugs, sediments and chemicals, and perform a variety of water vapor distillation detection tasks, such as volatile basic nitrogen, alkaline hydrolysis nitrogen, ammonia nitrogen, nitrate nitrogen, non-protein nitrogen, protein nitrogen, available nitrogen, total volatile acid, formaldehyde, volatile phenol, sulfur dioxide , sulfide, white block, preservatives, dioxins/alkanes, alcohols, etc. The universal applicability, accuracy and repeatability of the Kjeldahl method have been widely recognized internationally.



Post time: 2021-04-16

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