Fraser Brothplus Improves Choice for Listeria Culture

Lab M, the microbiology culture media specialist, has introduced new variants of Fraser Broth known as Fraser BrothPLUS for the enrichment of Listeria species. The new products are designed to help overcome issues with conventional formulations when culturing organisms for subsequent ELISA analysis and they provide users with a valuable choice.

The presence of antagonistic compounds in conventional formulations appears to interfere with subsequent ELISA procedures by compromising the isolation rates of target organisms. With Lab M's new ½ Fraser BrothPLUS and Fraser BrothPLUS, the antibiotic supplement is blended into the base medium, but the ferric ammonium citrate (FAC) component is supplied separately as a supplement. By separating the FAC from the base medium, it can be omitted for improved ELISA performance, or included for compliance with the ISO 11290 standard.

Fraser Broth is traditionally used as a secondary enrichment medium for the isolation of all Listeria species. With the incorporation of ½ strength supplement, it can also be used as a primary resuscitation or enrichment medium.