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Colorex™ Salmonella Plus is a chromogenic media for the isolation and presumptive identification of Salmonella spp, S typhi, S.paratyphi and lactose positive Salmonella from foodstuffs. Any presumptive Salmonella spp. will produce a mauve colouration; other organisms will be blue or colourless in appearance. Cefsulodin is added as a selective agent to inhibit the growth of Pseudomonas and Aeromonas species. Any presumptive isolates must be confirmed using serological and biochemical techniques available to the laboratory. This product meets the requirements of ISO 6579:2002 standard. -
Dey & Engley Broth has the ability to neutralise antimicrobial chemicals and is used for environmental sampling for the detection and enumeration of microorganisms present in cosmetic and/or environmental samples. In this formulation the broth has been modified by the addition of Tween 80 (Polysorbate 80), Lecithin, Sodium thioglycollate, Sodium thiosulphate and Sodium bisulphite. It is recommended for use in environmental testing, particularly in areas subjected to surface disinfection, and conforms to the requirements of the British Pharmacopeia for sterility testing of appropriate pharmaceutical products. The product also conforms to ISO 21149 to act as a diluent in the method for the enumeration of aerobic bacteria from cosmetic samples. Lecithin and Polysorbate 80 (Tween 80) inactivate surface disinfectants (Lecithin neutralises quaternary ammonium compounds and Tween 80 neutralises phenols, formalin, hexachlorophene and in combination with the Lecithin ethanol). Sodium thioglycollate neutralises mercurials, Sodium thiosulphate neutralises iodine and chlorine and Sodium bisulphite neutralises aldehydes. Bromocresol purple is incorporated into the medium to indicate glucose utilisation. -
This is a base medium to which can be added selective supplements of choice for the presumptive identification and enumeration of Clostridium perfringens in food products using poured plate techniques. Sodium metabisulphite and Ferric ammonium citrate are included in the base and together provide an indicator of sulphite reaction by Clostridium perfringens, which produces black colonies on the medium. It is recommended that this medium be used with an overlay otherwise cultures may not grow as black colonies. NB: This is a base medium only and contains no selective supplements.
