Determination of the amine content in wort and beer
This method is suitable for wort and beer.
Determination by means of reversed phase chromatography after pre-column derivatization with dansyl chloride and fluorescence and UV detection.
Wort samples of all kinds.
Analysis of wort for beer-spoilage bacteria (anaerobic). In the case of trace infections, it may be necessary to carry out a second enrichment. Slow-growing (e.g. Pediococcus spp.) or thermally damaged microorganisms can also be detected here.
Detection of indirect beer-spoilage organisms to monitor the microbiological situation in the cold wort area.
Pitching wort
A number of different bacteria that can be found in water, also develop in hopped wort. They are summarised under the term "wort bacteria" and largely belong to the Enterobacteriaceae family. Pseudomonas spp. are occasionally found in water treatment plants. Many microorganisms can only exist or multiply in a sufficiently oxygen-rich atmosphere, i.e. under aerobic conditions.
Preliminary microscopic analysis for aerobic wort bacteria and check for wort bacteria odour after prior aerobic incubation.
To determine whether the wort contains microorganisms capable of reproduction, incubate the wort sample for up to 7 days at 27 ± 2 °C and then analyse using dark-field microscopy.
Malt intended for use in beer brewing or elsewhere in the food industry
After boiling for two hours on a reflux condenser, the wort is clarified using membrane filtration. The color is measured with a spectrophotometer.
Applicable for all (laboratory) worts
The Congress wort is heated in order to inactivate the amylolytic enzymes. Afterwards, 16 g/100 ml yeast is added, and the wort is allowed to completely ferment out in approx. 7 h.
Determination of the viscosity of beverages
wort, beer, beer-based beverages, NAB, juice, beverages in general
Capillary viscometers measure the kinematic viscosity of Newtonian fluids, unlike falling ball and the rotational viscometers, which directly measure the dynamic viscosity. However, with values for the kinematic viscosity and the density of the test liquid, the dynamic viscosity can be calculated.
The time required for a volumetrically defined amount of fluid (the volume between two marks on the tube of the viscometer) to flow through a capillary of a defined length is measured.
1 square meter per second of a homogenous fluid with a dynamic viscosity of 1 Pa × s and a density 1 kg/m³
The unit for expressing kinematic viscosity (the relationship of viscosity to density = viscoplasticity) is 1 m²/s = 106 mm²/s
The kinematic viscosity is expressed as 1 square meter per second of a homogenous fluid with a dynamic viscosity of 1 Pa × s and a density 1 kg/m³.