Mineral, spring and table waters as well as drinking waters that are to be marketed.
Qualitative detection of sulphite-reducing, spore-forming anaerobes in mineral water, spring water, table water, and other drinking water bottled for distribution to the consumer, by means of membrane filtration and placing the filter on a solid culture medium.
Note 1: If only the spores of sulphite-reducing anaerobes are to be analysed, the prescribed sample volume must be heated at 75 °C ± 1 °C for 10 minutes in order to inactivate the vegetative cells. Then cool quickly with cold water.
Important: Carry out a comparative test with the same volume of tap water to determine the total heating time required in the water bath.
Membrane filtration (MF) and placing the filter on dextrose-iron sulphate-sodium sulphite agar (DRCM agar) (corresponds to method Annex 2, point 4 a of § 4 para. 3 of the German Mineral and Table Water Ordinance, MTV) [1].
Mineral, spring and table waters as well as drinking waters that are to be marketed.
Qualitative detection of Escherichia coli and coliform bacteria in mineral, spring and table water, and other drinking water bottled for distribution to the consumer, by means of membrane filtration (MF) and placing the filter on endo agar [1].
This method describes how to determine whether a lot of barley or wheat is contaminated with Fusarium graminearum using mannitol agar.
Fusarium graminearum contamination in barley or wheat can be visually determined with the naked eye after three to five days of incubation on mannitol agar.
Fusarium culmorum contamination in barley or wheat can be visually determined with the naked eye after three to five days of incubation on mannitol agar to which malachite green has been added.
Membrane filtration is a simple way of concentrating microorganisms from a liquid sample.
Filtered beers
Membrane filtration and anaerobic incubation
Check for microbiological vulnerabilities by detecting bacteria (moderately acid-tolerant bacteria) and yeasts in process water.
Pour-plate method and membrane filtration