Interpolation formulas for Balling´'s alcohol factors
2020
Petr Košin (Budějovický Budvar, n.p., Karolíny Světlé 4, 370 21 České Budějovice, Czech Republic) | Jan Šavel (Budějovický Budvar, n.p., Karolíny Světlé 4, 370 21 České Budějovice, Czech Republic) | Adam Brož (Budějovický Budvar, n.p., Karolíny Světlé 4, 370 21 České Budějovice, Czech Republic) | Jakub Vlček (Budějovický Budvar, n.p., Karolíny Světlé 4, 370 21 České Budějovice, Czech Republic)
The article deals with the interpolation of the Balling alcohol factors, given at isolated points in 1% (m/m) increments ranging from 1 to 30% in the Hrach table published in 1927. Interpolation was necessery for the calculation of real (RDF) or apparent (ADF) degree of attenuation, according to which optimal barley varieties were selected for beer production. Analytica EBC initially preferred ADF, although it also reported RDF, used by ASBC. According to ASBC, the Balling RDF is multiplied by a correction factor or calculated using a modified calculation formula. Both ways gave the same results and increased Balling RDF values by 1-2% m/m. Refractometry with a pocket digital refractometer set to °Bx allows beer analysis from a minimum sample volume.
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