An Improved System for the Conductometric Determination of Hop α-Acids. K. J. Siebert, The Stroh Brewery Co., One Stroh Drive, Detroit, MI 48226. J. Am. Soc. Brew. Chem. 38:0119, 1980.

An integrated analytical procedure and calculation approach was developed for the conductometric determination of α-acids in hops. A digital conductivity meter was designed and constructed for following the titration. A programmable printing calculator was used to perform the calculations and to provide a written record of the titration. This analysis system is capable of handling both direct linear conductivity results from a conductance bridge circuit and data obtained with the digital meter (using the appropriate transformations). Results obtained with this method are very similar in magnitude and more precise than results obtained with the conventional procedure. This system also offers improvement in documentation and error detection and is faster and more convenient to use.

Keywords: Digital conductivity meter, Lead acetate titration, Linear regression, Numerical method, Programmable calculator, Transformation