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Tech. Q. Master Brew. Assoc. Am., 1997, 34(4), 257-258.

Determination of moisture, total available extract and soluble extract in spent grains.

Castane, F.X. and European Brewery Convention Analysis Committee.

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 (r95) and reproducibility (R95) values. Repeatability and reproducibility values of 0.1 and 0.67 respectively were obtained for spent grain moistures ranging between 4 and 8% m/m in pre-dried and pre-milled samples. In a pre-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+0.045m) 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+0.007m and a reproducibility value of 0.2+0.06m were obtained over this range. Values for the same predried and unmilled sample with a soluble extract of 38.7% m/m were 1.3 and 3.8% m/m respectively.
Keywords : analysis collaborative test extract moisture content spent grains