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Determination of the total soluble nitrogen content of malt and beer by the Dumas combustion method: collaborative trial. Submitted on behalf of the Analysis Committee of the Institute of Brewing and the Analysis Committee of the European Brewery Con
Johnson, B.A., and Johansson, C.-G.

The determination of the total soluble nitrogen content of malt and beer, by the Dumas procedure, has jointly been collaboratively tested by the Analysis Committees of the Institute of Brewing (IOB) and the European Brewery Convention (EBC). Five samples of beer (range 362 to 1159 mg/l) and five samples of malt (range EBC 0.598 to 0.798% m/m (dry basis) and IOB 0.534 to 0.706% m/m (dry basis)) were distributed to eighteen participating laboratories for analysis. Precision values were judged to be independent of the mean soluble nitrogen content for malt by both IOB and EBC methodologies. Values for r95 and R95 were 0.047 and 0.136%m/m for EBC laboratory wort and 0.039 and 0.144% m/m for IOB laboratory wort respectively. Precision values for beer were judged to be dependent upon the mean nitrogen content (m) in the case of r95 and independent of the mean nitrogen content in the case of R95. Values for r95 and R95 were 0.074m and 120 mg/l respectively.

Descriptors: Soluble nitrogen, malt, beer, collaborative test

Monatsschrift fr Brauwissenschaft 53, Nr. 3/4, 50-53, 2000