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ISO 3188:1978

Current Revision

Starches and derived products -- Determination of nitrogen content by the Kjeldahl method -- Titrimetric method

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The found value only includes free amino acids, compounds producing amino acids on hydrolysis and ammonium compounds. The principle consists in destruction of organic matter by sulphuric acid in the presence of a compound catalyst (see ISO 1871), alkalization of the reaction products, distillation of the liberated ammonia and collection in a boric acid solution, followed by titration with a standard volumetric sulphuric acid solution. The method applies to contents greater than 0,01 % (m/m). For products with contents less than 0,025 % (m/m), see ISO 5378.


SDO ISO: International Organization for Standardization
Document Number ISO 3188
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 93
Publish Date Document Id Type View
Not Available ISO 3188:1978 Revision