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Kjeldahl method
chemistry
How to understand the nutrition facts on food labelsUnderstanding food labels, nutrition, and health.
See all videos for this articleKjeldahl method, in analytical chemistry, procedure widely used for estimating the nitrogen content of foodstuffs, fertilizers, and other substances, invented in 1883 by a Danish chemist, Johan G.C.T. Kjeldahl. The method consists essentially of transforming all nitrogen in a weighed sample into ammonium sulfate by digestion with sulfuric acid, alkalizing the solution, and determining the resulting ammonia by distilling it into a measured volume of standard acid, the excess of which is determined by titration.
This article was most recently revised and updated by Michele Metych.
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