Investigations about the relative Hartong extract at 45°C

The relative extract at 45°C (VZ 45°C) was introduced by Hartong in the 1930^th. Today it is an important figure for the German barley variety trials. Investigations that were done to answer the question whether the VZ 45°C is a proteolytic, cytolytic or amylolytic figure disproved correlations that were published in the past. The VZ 45°C is the relation of soluble starch at 45°C to soluble starch in the congress wort. Therefore the VZ 45°C is an amylolytic figure. Furthermore a correlation between the VZ 45°C and the gelatinisation temperature of the malt was found.