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DETERMINATION OF TOTAL NITROGEN IN BARLEY, MALT AND BEER BY KJELDAHL PROCEDURES AND THE DUMAS COMBUSTION METHODCOLLABORATIVE TRIAL
Author(s) -
BUCKEE G. K.
Publication year - 1994
Publication title -
journal of the institute of brewing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 51
eISSN - 2050-0416
pISSN - 0046-9750
DOI - 10.1002/jib.1994.100.2.57
Subject(s) - kjeldahl method , brewing , repeatability , nitrogen , chemistry , reproducibility , mathematics , food science , analytical chemistry (journal) , environmental science , environmental chemistry , chromatography , organic chemistry , fermentation
A method relying on the Dumas Combustion Principle for the determination of total nitrogen in barley, malt and beer has been collaboratively tested by the Analysis Committee of the Institute of Brewing. "Kjeldahl" procedures were used for comparison. The Committee approved the adoption of the Dumas procedure as the reference method for barley and malt. Precision values were independent of total nitrogen content for barley and malt, over the range 1.17 to 1.71 %m/m and 1.45 to 2.03 %m/m (as is) respectively. Repeatability (r 95 ) and reproducibility (R 95 ) values were 0.030 and 0.070 respectively for barley and 0.036 and 0.065 respectively, for malt, over the given ranges. Slightly higher values were obtained for total nitrogen by the Dumas method, compared with those given by Kjeldahl procedures.