title: Improved egg-yolk agar plate medium for the detection of clostridial phospholipase C activity.
abstract: A new modification of the egg-yolk agar plate medium, an egg-yolk triple-salt medium, is described. The medium incorporates a tryptic soy agar base, yeast extract, D-glucose CaCl2, MgCl2 and ZnSO4. Only in egg-yolk triple-salt medium did all tested phospholipase-C-producing clostridia form a lecitho-vitellin precipitate after overnight incubation; 95.5% formed a high-density precipitate in the new medium as opposed to 6.1%, 6.6%, 10.6% and 20.2% of the isolates not forming a visible precipitate in liver-veal, Lombard-Dowell, McClung and Toabe modified, and "viande-levure" egg-yolk media, respectively, after the same incubation time.
authors.affiliation: University of Calgary, Alberta, Canada.
authors.forename: S M
authors.initials: SM
authors.lastname: Gubash
mesh_terms: D000362:Agar; D003013:Clostridium / Q000201:enzymology*; D003470:Culture Media; D004530:Egg Yolk; D010738:Type C Phospholipases / Q000378:metabolism*
chemical_list: D003470:Culture Media; D000362:Agar; D010738:Type C Phospholipases