What accreditation does impedance technique have?
AOAC APPROVAL Background AOAC adopted as first action the automated conductance method for Salmonella in foods. The method is based on the principle of conductance changes due to the presence of Salmonella compared to those for non-salmonellae. The Initial AOAC trial was co-ordinated by Malthus. AOAC clearly state that any other equipment that meets the critical parameters and system suitability standards of the method is acceptable, ie RABIT. Current Practice Principle Samples are pre-enriched in buffered peptone water-lysine-glucose broth followed by 2-tube conductance assay in selenite-based media containing trimethylamine-N-oxide and dulcitol (Easter and Gibson) and lysine (Ogden’s Lysine). Salmonella spp typically give large conductance changes in these 2 media compared to those for non-salmonellae. Presumptive positive result is obtained within 48 hours. Confirmation of Presumptive Positive Conductance Results Presumptive positive conductance assay indicates that Salmonella may b
