New broth variants from Lab M

Published: 8-Mar-2007


Lab M has launched two variants of its broth medium for the isolation of Listeria.

Fraser BrothPLUS and Half Fraser BrothPLUS are formatted to give improved results in both traditional culture and Enzyme-Linked ImmunoSorbent Assay (ELISA) methods.

The new products meet the specifications of the ISO 11290 standard for the detection and enumeration of Listeria monocytogenes. Fraser Broth is traditionally used as a secondary enrichment medium for the isolation of all Listeria species. With the incorporation of half strength supplement, it can also be used as a primary resuscitation or enrichment medium.

Fraser BrothPLUS and Half Fraser BrothPLUS differ from conventional formulations in the inclusion of selective agents in the base medium. The ferric ammonium citrate (FAC) component is provided as a supplement to be added after sterilisation. This format has been shown to give improved selectivity with pure cultures and food samples, the company says.

Both the new media meet the technical specifications of the ISO/TS 11133-2 standard for the microbiology of food and animal feedstuffs.

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