Barley intended for the production of malt is evaluated with regard to pre-germination.
Kernels suspected of having pre-germinated are boiled in water and then allowed to remain in cold water for some time. Thereby, the husks become transparent, making the embryo and the acrospire, if present, visible.
Hops and hop products intended for use in beer brewing or elsewhere in the food industry
The volatile constituents in hops or hop products are obtained by means of steam distillation. The hydrocarbon and oxygen fractions are separated using a process involving column chromatography.
This method describes how to determine the sulfate content in water by cation exchange.
A water sample is run through an ion exchanger in which all of the cations are replaced with hydrogen ions. The sulfate is determined through titration in the presence of a previously prepared barium chloride solution, of which a known amount in excess of that required is added in advance. The quantity is measured by complexometric titration. The difference between the initial concentration of barium chloride and the amount determined by back titration corresponds to the sulfate content.
In many cases, particularly at higher contents, an alternative and sufficiently accurate measurement is possible, called the “negative m value” or the “total mineral acid value” (without carbonic acid). This is achieved through titration. Subsequently, the mval values for the anions (Cl-, NO3-, NO2-, PO43-) are subtracted from the result.
Water intended for use as an ingredient in the production of beer (brewing liquor) or other foods
Oils and fats dispersed in water are precipitated using aluminum sulfate. After dissolving the precipitate with hydrochloric acid in organic solvents, they can be separated from the mineral salts.
This method describes the general requirements for boiler water:
Alkalinity (p value)
Total mineral content
Boiler feed water for use in the production of beer and other foods
Boiler water for use in the production of beer and other foods
Analogous to the p and m values obtained in the determination of acid capacity (pH 8.2 and 4.3), this analysis is performed according to W-000.13.031 Acid Consumption (Alkalinity, p-Value and m-Value)/Acid Capacity to pH of 8.2 and/or 4.3 for Water. The alkaline capacity of the boiler water is determined through titration of the sample with 0.1 N sodium hydroxide (instead of hydrochloric acid) to a pH of 4.3 and/or 8.2.