Validation of a modified version of ActeroTM salmonella enrichment media for rapid detection of salmonella spp. In environmental and food samples: AOAC performance tested methodSM 041403

Abstract

Background: ActeroTM Salmonella Enrichment Media1 (ActeroTM Salmonella) is a culture broth developed to recover Salmonella spp. from foods and environmental surfaces. Performance of ActeroTM Salmonella broth has already been assessed and validated (AOAC Performance Tested MethodSM 041403) for the detection of Salmonella spp. in various foods, feeds and environmental samples. Objective: This study aimed to validate the performance of a modified version of ActeroTM Salmonella broth by incorporating one of the two liquid supplements into the powdered formula. Methods: Inclusivity, exclusivity, stability, and lot-to-lot studies were carried out. Raw ground beef, chicken carcass rinse, dry pet food and stainless steel samples were enriched for 14–20 h at 35–390C and analyzed using real-time PCR assay as well as by direct plating. Results: The Probability of Detection assay confirmed the equivalent performance of the alternative methods as compared to the reference methods. All Salmonella strains, except Salmonella II: 57: z29:-, were able to grow in ActeroTM Salmonella broth. One-half of the non-target strains did not grow in ActeroTM Salmonella broth, whereas the atypical for Salmonella growth was observed for other non-target microorganisms subsequently plated onto selective and differential agars. Lot-to-lot consistency was demonstrated for three consecutively manufactured lots of the broth. The liquid broth was proven to be stable at 40C for up to 9 weeks of storage. Conclusions and Highlights: The incorporation of one of the two specific supplements into a powdered formula of ActeroTM Salmonella broth made it more convenient to use without compromising the performance and accuracy.