Egg Yolk Agar (EYA) is an enriched non-selective and differential medium for the presumptive identification of certain anaerobic isolates. Egg Yolk Agar medium contains a suspension of egg yolk for the presumptive identification of various Clostridium, Fusobacterium and Prevotella spp. The egg yolk suspension allows for the detection of lecithinase and lipase activity. The degradation of lecithin in the egg yolk results in an opaque precipitate around the colonies. The Lipase enzyme hydrolyzes the fats within the egg yolk, which results in an iridescent sheen on the colony surface. Another common reaction observed is proteolysis of the egg yolk as indicated by a clearing of the medium around the colonies. This medium is supplemented with vitamin K1 and Hemin to facilitate the recovery of anaerobes. This medium is dispensed under oxygen-free conditions to prevent the formation of oxidized products prior to use.
Anaerobe Systems PRAS Egg Yolk Agar (EYA) AS-511
Egg Yolk Agar Products