Title: Persistence of salmonella Typhimurium in Nopal
Authors: Landa-Salgado P, Hernandez Anguiano AM, Vargas Hernandez M, Eslava Campos C, Chaidez Quiroz C, Patel JR
Journal: Revista Fitotecnia Mexicana
Accepted date: 2013 May 22
Interpretive summary: The Nopal (paddle cactus) plant is a common and regular part of a variety of cuisine dishes in Mexico. Young cladode (pad) of nopal may be contaminated with Salmonella at the pre-harvest level. We evaluated persistence of Salmonella Typhimurium in nopal and in soil. Nopal plants and soil were inoculated with Salmonella and then evaluated for surviving population of Salmonella for 14 days. The persistence of Salmonella on nopal pad varied with physiological conditions. Salmonella were undetectable in secondary cladodes after 9 days; however, they persisted on mother cladodes and pre-cut cladodes for 14 days. Further, Salmonella contamination activated the defense response mechanism of nopal. A dark lesion at the inoculation site was observed in cladodes irrespective of their physiological conditions. Further, cladode dehydration and tissue detachment was observed in secondary cladodes. The adoption of Good Agricultural Practices (GAPs) to minimize Salmonella contamination will be helpful in reducing foodborne infections associated with nopal consumption. This information should be useful to other scientists.
Publication date: 2013 Jun 18
Related projects: Microbial Ecology and Safety of Fresh Produce