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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
In analytical chemistry, the Dumas method is a method of elemental analysis for the quantitative determination of nitrogen in chemical substances based on a method first described by Jean-Baptiste Dumas in 1826. [1]
protein by analysis of total nitrogen, either by Dumas or Kjeldahl methods; total fat, traditionally by a solvent extraction, but often now by secondary methods such as NMR; crude ash (total inorganic matter) by combustion at 550 °C; estimated dietary fibre by various AOAC methods such as 985.29
McGee, Harold, The Curious Cook. North Point Press, Berkeley, 1990. McGee, Harold, On Food and Cooking: The Science and Lore of the Kitchen. Scribner, New York, 2004. ISBN 0-684-80001-2. This, Hervé, Building a Meal: From Molecular Gastronomy to Culinary Constructivism, Columbia University Press 2009 ISBN 978-0-231-14466-7
Ammoniacal nitrogen (NH 3 –N) is a measure commonly used for testing the quantity of ammonium ions, derived naturally from ammonia, and returned to ammonia via organic processes, in water or waste liquids.
At times, it seems the trouble that cats get into is entirely accidental. I can forgive my cat’s near-daily scattering of litter outside their box due to super-enthusiastic waste-burial techniques.
Yeast need a reliable source of nitrogen in forms that they can assimilate in order to successfully complete fermentation. Yeast assimilable nitrogen or YAN is the combination of free amino nitrogen (FAN), ammonia (NH 3) and ammonium (NH 4 +) that is available for a yeast, e.g. the wine yeast Saccharomyces cerevisiae, to use during fermentation.
An Alabama inmate would be the test subject for the “experimental” execution method of nitrogen hypoxia, his lawyers argued, as they asked judges to deny the state’s request to carry out his ...