Nutrient-free special medium for spray shadow test
Biofilms or organic materials remaining after cleaning can be detected using swabs and suitable nutrient media, as well as with the ATP measurement method [1, 2]. In order to visually check the efficiency of the installed internal cleaning system also “just-in-time”, a conventional retention or spray shadow test has been carried out for some years during commissioning, acceptance testing and revalidations, in addition to microbiological swab sampling. The composition of the media applied has been continuously developed further since their first use in 2002 (table 1) [3, 4, 5, 6]. In the context of a doctoral thesis, a new test medium [8] has now been developed, one that cannot be utilised by beverage-spoilage micro-organisms.
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