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SPECTROPHOTOMETRIC DETERMINATION OF MALT COLOUR
Author(s) -
White F. H.
Publication year - 1995
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/j.2050-0416.1995.tb00878.x
Subject(s) - repeatability , reproducibility , chromatography , chemistry , round robin test , sample (material) , analytical chemistry (journal) , mathematics , statistics
The International Method for the determination of the colour of beer has been tested by members of the Analysis Committee of the European Brewery Convention on samples of wort produced from a laboratory extract of malt using methods EBC 4.4 and EBC 4.4.5. The method, which relies on the spectrophotometric determination of colour at 430 nm, on clarified worts, is recommended as the designated reference method in place of the current visual method using EBC colour discs. The change will take effect from 1st January 1996. It was judged that precision values were dependent on the intensity of the colour of the sample over the range 3.6 to 25.3 EBC units. Repeatability (r 98 ) and Reproducibility (R 98 ) values of r 98 0.18Mean − 0.28 and R 98 = 0.13Mean + 0.46 were obtained over this range.