Producción Científica Profesorado

Frequency and Behavior of Salmonella and Escherichia coli on Whole and Sliced Jalapeño and Serrano Peppers



González Ramírez, César Abelardo

2011

Castro Rosas, J., Gómez Aldapa, C.A., Acevedo Sandoval, O., González Ramírez, C.A., Villagómez Ibarra, J.R., Chavarría Hernández, N., Villarruel López, A. y Torrez Vitela, M.R., 2011. Frequency and Behavior of Salmonella and Escherichia col ion Whole and Sliced Jalapeño and Serrano Peppers. Journal of Food Protection, 74, 874-881, ISSN 0362-028X, IF 1.96.


Abstract


The frequencies of coliform bacteria (CB), thermotolerant coliforms (TC), Escherichia coli, and Salmonella were determined for jalapeño and serrano peppers. In addition, the behavior of four serotypes of Salmonella and three E. coli strains on whole and sliced jalapeño and serrano peppers as well as in blended sauce at 25 2C and 3 to 5C was investigated. Chili peppers were collected from markets in the city of Pachuca, Hidalgo, Mexico. CB, TC, E. coli, and Salmonella were detected on serrano peppers in 100, 90, 50, and 10 % of the samples, and on jalapeño peppers in 100, 86, 32, and 12 % of the samples. Concentrations of CB ranged from 3.8 to 7.9 log CFU per serrano sample and from 5.3 to 8.2 log CFU per jalapeño sample, whereas concentrations of TC and E. coli were between < 3 and 1,100 most probable number per serrano and jalapeño samples. On whole serrano and jalapeño peppers stored at 25 2C or 3 to 5C, no growth was observed for rifampin-resistant strains of Salmonella and E. coli. After 6 days at 25 2C, the tested Salmonella serotypes and E. coli strains had decreased from an initial inoculum level of 5 log CFU to 1 and 2.5 log on serrano and jalapeño peppers, respectively, and at 3 to 5C they decreased to approximately 1.8 and 1.2 log, respectively, on serrano and jalapeño. Both the Salmonella serotypes and E. coli grew on sliced chili peppers and in blended sauce; after 24 h at 25 2C, both bacteria types had grown to approximately 4 and 5 log CFU on pepper slices and in sauce, respectively. At 3 to 5C the bacterial growth was inhibited.






Artículos relacionados

Procedures in Ready Biodegradability Testing: Effects of the Inoculation and the Monitored Parameter

MODELACIÓN MATEMÁTICA DE LA CINÉTICA DE CATALIZADORES PARA LA PRODUCCION DE DIESEL DE ULTRA BAJO AZU...

Inocula from activated sludge for ready biodegradability testing: Homogenization by preconditioning

DISEÑO DE UNA PLANTA DE TRATAMIENTO DE AGUAS RESIDUALES BASADO EN EL PRINCIPIO DE CONSORCIOS MICROBI...

Two-step modeling of the biodegradation of phenol by an acclimated activated sludge

ANÁLISIS DE LAS ESTRATEGIAS DE CONTROL DE LA SECCIÓN DE DESPROPANIZACIÓN EN LA PLANTA PETROQUÍMICA J...

Toward a standardization of the microbial inoculum for ready biodegradability testing of chemicals

Degradación física del almidón de cebada (Hordeum sativun Jess). Correlación entre la gelatinización...

Manganese accumulation in plants of the mining zone of Hidalgo, Mexico

Mathematical modeling of diffusion regulated Quorum sensing in Artificially Structured Microbial Con...