Publicado

2014-05-01

Direct detection of toxigenic Bacillus cereus in dietary complement for children and cassava starch

Detección directa de Bacillus cereus toxigénicos en complementos dietarios para niños y en almidón de yuca

Palabras clave:

Bacillus cereus, enterotoxins, emetic toxin, dried foods, Multiplex PCR. (en)
Bacillus cereus, enterotoxinas, toxina emética, alimentos pulverizados, PCR múltiple. (es)

Autores/as

  • Jnnifer A. Sánchez Universidad de Antioquia
  • Margarita M. Correa Universidad de Antioquia
  • Ángel E. Aceves Dies Departamento de Investigación y Desarrollo, Laboratorios Minkab
  • Laura M. Castañeda Sandoval Universidad de Antioquia
Bacillus cereus is a food contaminant and
a known human pathogen that can cause
emetic and diarrheal syndromes. In this study
we evaluated the presence of toxigenic B.
cereus by multiplex PCR directly in dietary
complement for children and cassava starch
samples collected on Medellin, Colombia.
Of 75 dietary complement for children
samples evaluated, 70.7% were contaminated
with toxigenic B. cereus and four different
toxigenic consortia were detected: I: nheA,
hblC, cytK (9.8%), II: nheA, hblC (2%),
III: hblC, cytK (41.2%), IV: hblC (47%).
Of 75 cassava starch samples, 44% were
contaminated with toxigenic B. cereus and
four different toxigenic consortia were
determined: I: nheA, hblC, cytK (48.5%),
II: nheA, hblC, cytK, cesB (3%), III: hblC,
cytK (30.3%), IV: hblC (18.2%). In general,
in dietary complement for children only
enterotoxigenic consortia were detected
while in cassava starch the enterotoxigenic
consortia predominated over the emetic.
Multiplex PCR was useful to detect toxigenic
B. cereus contamination allowing direct
and simultaneous detection of all toxin
genes in foods. This study is the first in
Colombia to evaluate toxigenic B. cereus,
providing information of importance for
microbiological risk evaluation in dried
foods.

Bacillus cereus es un contaminante de alimentos
conocido por ser patogénico para los humanos,
causando síndromes de vómito y diarrea.
En este estudio se evaluó la presencia de B.
cereus toxigénicos utilizando PCR múltiple
directamente en complementos dietarios
para niños y en almidón de yuca colectados
en Medellín, Colombia. De 75 muestras de
complemento dietario para niños, 70,7%
estuvieron contaminadas con B. cereus
toxigénicos y se detectaron cuatro diferentes
consorcios toxigénicos: I: nheA, hblC, cytK
(9,8%), II: nheA, hblC (2%), III: hblC, cytK
(41.2%), IV: hblC (47%). De 75 muestras de
almidón de yuca, 44% estuvieron contaminadas
con B. cereus toxigénicos y se determinaron
cuatro diferentes consorcios toxigénicos: I:
nheA, hblC, cytK (48.5%), II: nheA, hblC, cytK,
cesB (3%), III: hblC, cytK (30,3%), IV: hblC
(18.2%). En general, en los complementos
dietarios para niños sólo se detectaron
consorcios enterotoxigénicos, mientras que en
el almidón los consorcios enterotoxigénicos
predominaron sobre el emético. La PCR
múltiple fue de utilidad para detectar
contaminación con B. cereus toxigénicos
permitiendo la detección directa y simultánea
de todos los genes tóxicos en los alimentos. Este
estudio es el primero en Colombia en evaluar B.
cereus toxigénicos y proporciona información
importante para la evaluación de riesgos
microbiológicos en los alimentos pulverizados

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