HVG Germany: Hopfen

 

However a few solvents are subject to special suspicions. They can cause headaches and nausea, some such as benzole are suspected of being carcinogenic. In any case solvents do have to be disposed of after use, but even so they should not cause any harm to the environment in the waste water etc.

To summarize this chapter, we have to recognise that many points contribute to the overall evaluation an analysis. Compromises often have to be met which is also the reason why there are several methods for one and the same measuring problems.

Survey for the most important analyses for bitter compounds


In the following survey the most important methods are listed together under the criteria: Reference, Abbreviation, Measuring Principle, Solvent and Evidence: :

Reference


EBC 7.4 & ASBC 6


EBC 7.5 &
Mebak 5.1.5.1

EBC 7.5 &
Mebak 5.1.5.1


ASBC 9.6


EBC 7.7
Abbreviation


1. EBC-Toluol 1)


2a Woellmer 1)


2b Volle Woellmer


3. Spectro 2)


4. HPLC 3)
Measuring Principle

Conductometry


Conductometry


Gravimetry +
Conductometry


Spectral photometry


High pressure liquid
chromatography
Solvent


Toluol + Methanol

Ether + Methanol

Ether, Methanol +
Hexan

Toluol + Methanol

Ether, Methanol

Statement


Alpha-acids


Alpha-acids


Total resins,
soft resins,
Hard resins
Alpha- + beta-acids +
aging index

Alpha- + beta-acids, indication
of variety and aging 


1) Unspecific value for alpha-acids
2) Unspecific value for alpha- and beta-acids
3) Specific value for alpha- and beta-acids