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The Kjeldahl method or Kjeldahl digestion (Danish pronunciation: [ˈkʰelˌtɛˀl]) in analytical chemistry is a method for the quantitative determination of a sample's organic nitrogen plus ammonia/ammonium (NH 3 /NH 4 +). Without modification, other forms of inorganic nitrogen, for instance nitrate, are not included in this measurement.
During the 1880s, Kjeldahl used potassium sulfate to raise the boiling point of the acid and mercury as a catalyst to speed the decomposition. For the back titration process of the released ammonia, he used boric acid buffer solution. On 7 March 1883, Kjeldahl presented his method at the Danish Chemical Society.
The classic assays for protein concentration in food are the Kjeldahl method and the Dumas method. These tests determine the total nitrogen in a sample. The only major component of most food which contains nitrogen is protein (fat, carbohydrate and dietary fiber do not contain nitrogen).
Protein digestibility-corrected amino acid score (PDCAAS) is a method of evaluating the quality of a protein based on both the amino acid requirements of humans and their ability to digest it. The PDCAAS rating was adopted by the US FDA and the Food and Agriculture Organization of the United Nations / World Health Organization (FAO/WHO) in 1993 ...
Kjeldahl may refer to: Johan Kjeldahl (1849–1900), Danish chemist; Kjeldahl method, analytical chemistry method for determining total nitrogen
Isla Fisher is still honoring the former nuptials of Brad Pitt and Jennifer Aniston. In a new interview with British newspaper The Times, published Saturday, Feb. 8, the actress, 49, revealed that ...
The total nitrogen content of organic matter is mainly formed by the amino groups in proteins. The Total Kjeldahl Nitrogen is a measure of nitrogen widely used in the analysis of (waste) water, soil, food, feed and organic matter in general. As the name suggests, the Kjeldahl method is applied. More sensitive methods are available.
Over 130 years after his gruesome murders in East London, England, the descendants of his victims are looking to unmask the identity of the serial killer popularly known as Jack the Ripper. The ...