Alpha acids in hops Determination according to EBC 7.4 by conductometric titration



Determination of alpha acids according to EBC 7.4

Hops play an important role in the brewing process, as out accurately. Depending on the type of beer, different 02

they have an enormous effect on the flavor, bitterness varieties of hops are used; they differ in their content of and shelf life of beer. The alpha acids contained in hops alpha acids. According to the European Brewery Conven-are crucial for the bitterness of the beer. Bitterness is ex-tion (EBC 7.4) the content of alpha acids is determined pressed in IBU (International Bittering Units), with one by means of conductometric titration with lead acetate IBU equating to 1 mg of dissolved alpha acids. In order to solution. This method can be used for all hop products, achieve the required bitterness at the end of the brewing e.g., hop umbels, pellets or extracts.

process, the quantity of hops added must be measured





Easy, fast and cost-effective determination with the 856 Conductivity Module With the 856 Conductivity Module and tiamo TM titra-quent titration are carried out automatically at the sin-03

tion software, Metrohm offers a system that can be gle touch of a button. At the end of determination the used to determine alpha acids in hops easily, fast and result can be calculated in whatever format required and cost-effectively according to EBC 7.4. For this, the hop a freely confi gurable report can be saved as a PDF fi le or products are fi rst extracted with toluene. The user needs printed out directly. All determination data are stored in only to provide an aliquot of the toluene extract in the the tiamo TM database.

titration vessel; the addition of methanol and the subse-Typical titration curve for of alpha acids in hops.

Metrohm complete packages for conductometric titration



Package I

2.856.1210 856 Conductometric Titrator 2.856.0010

856 Conductivity Module 2.801.0040

801 Magnetic Stirrer 2.800.0010

800 Dosino



6.3032.220

Dosing Unit 20 mL



6.0915.100

Conductivity Measuring Cell 6.6056.231

tiamo TM 2.3 light



Package II

2.856.2210 856 Conductometric Titrator + Solvent 2.856.0010

856 Conductivity Module 2.801.0040

801 Magnetic Stirrer 2.800.0010

800 Dosino



6.3032.220

Dosing Unit 20 mL



6.0915.100

Conductivity Measuring Cell 6.6056.231

tiamo TM 2.3 light 2.800.0010

800 Dosino



6.3032.250

Dosing Unit 50 mL

Of course, conductometric titration can also be carried out fully automatically on an 814/815 Sample Processor.

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