title: Reference material for the evaluation of a standard method for the detection of salmonellas in foods and feeding stuffs.
abstract: To evaluate a standard salmonella isolation method a reference material consisting of 0.2 g spray-dried milk inoculated with Salmonella typhimurium and contained in gelatin capsules was prepared. The organisms were distributed homogeneously between capsules, and their numbers were stable for 120 d when the capsules were stored in dry conditions at 4 degrees C. Addition of these capsules with or without food samples to pre-enrichment broth gave low and reproducible levels of Salm. typhimurium contamination without altering the pre-enrichment and without influencing the other bacterial flora present. As a result of an interlaboratory trial, the reference material indicated that the food and/or its competitive flora may have a negative influence on the detection of salmonellas.
mesh_terms: D000818:Animals; D002214:Capsules; D003470:Culture Media; D005516:Food Microbiology; D005780:Gelatin; D005990:Glycerol; D006813:Humidity; D008892:Milk / Q000382:microbiology; D012015:Reference Standards; D012486:Salmonella typhimurium / Q000302:isolation & purification*; D058428:Silica Gel; D012822:Silicon Dioxide; D013696:Temperature
chemical_list: D002214:Capsules; D003470:Culture Media; D058428:Silica Gel; D012822:Silicon Dioxide; D005780:Gelatin; D005990:Glycerol