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DETERMINATION OF MOISTURE, TOTAL AVAILABLE EXTRACT AND SOLUBLE EXTRACT IN SPENT GRAINS
Author(s) -
Castaé F. X.
Publication year - 1997
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.2050-0416.1997.tb00963.x
Subject(s) - repeatability , reproducibility , moisture , chromatography , chemistry , dry matter , analytical chemistry (journal) , zoology , biology , organic chemistry
The methods for the determination of moisture 4 , total available 3,4 and soluble extracts 4 in spent grains have been collaboratively tested by members of the Analysis Committee of the European Brewery Convention to obtain repeatability (r 95 ) and reproducibility (R 95 ) values . Repeatability and reproducibility values of 0.1 and 0.67 respectively were obtained for spent grain moisture's ranging between 4 and 8% m/m in pre‐dried and pro‐milled samples. In a pro‐dried and unmilled sample containing 3.4% m/m moisture the values obtained were 0.3 and 1.5 respectively . For total available extract (MEBAK) these values were 0.5 and (2.2+0.045 m) respectively, with total available extract ranging from 9 to 42% m/m dry matter, where m refers to the actual value. The values for the pre‐dried and unmilled sample containing an extract of 41.2% m/m were 0.5 and 4.6 respectively . The precision values for soluble extract were dependent on the extract level of the sample over the range 6 to 40% m/m dry matter. A repeatability value of 0.13+0.007 m and a reproducibility value of 0.2+0.06 m were obtained over this range. Values for the same pre‐dried and unmilled sample with a soluble extract of 38.7% m/m were 1.3 and 3.8% m/m respectively .