This method describes how to determine the hectoliter weight of barley.
Barley intended for the production of malt is evaluated on the basis of the hectoliter weight.
The hectoliter weight determines how many kilograms 100 liters of barley weighs. For this analysis, the weight of a defined sample volume of barley is determined, and the corresponding hectoliter weight is calculated.
One hectoliter of malting barley generally weighs between 68 and 75 kg, although higher values are not unusual (up to 78 kg).
This method describes how to determine the hectoliter weight of malt.
Barley malt intended for use in beer brewing or elsewhere in the food industry.
The hectoliter weight determines how many kilograms 100 liters of malt weighs. This analysis provides an estimate for the volumetric space required for storage and transport of a lot of malt.
Membrane filtration is a simple way of enriching microorganisms from a liquid medium.
Quantitative enrichment of large, filterable volumes on NBB agar plates.
Membrane filtration on culture media.
Exclusion of contamination (indirect, potential and obligate beer-spoilage organisms) in the cold wort area.
Pitching wort with pure yeast culture.
In all brewery microbiological tests, the main aim is to detect obligate beer-spoilage organisms, but also potential beer-spoilage organisms that can lead to spoilage of the beverage.
Analysis of wort for beer-spoilage bacteria (anaerobic with pure yeast culture and enrichment).
Elimination of contamination (indirect, potential and obligate beer-spoilage organisms) in the cold wort area.
Pitching wort without pure yeast culture.
In all brewery microbiological tests, the aim is to detect obligate beer-spoilage organisms in particular, but also potential beer-spoilage organisms that can lead to the beverage spoiling.
Wort samples without pure yeast culture require microscopic control (as well as a check for wort bacteria odour). Dark-field microscopy is used to analyse samples for beer-spoilage bacteria, wild yeasts and any wort bacteria.
Membrane filtration is a simple way of concentrating microorganisms from a liquid sample.
Quantitative enrichment of large, filterable volumes on nutrient agar plates
Membrane filters with pore sizes of 0.65 µm retain yeasts from the liquid sample, which are then incubated aerobically on agar nutrient media. The filtrate is collected in a receiving container and then discarded. The colonies that have grown are then counted and analysed under a microscope.