Effect of synthetic antioxidants on stored maize grain mycoflora in situ

Authors

  • Andrea Nesci,

    1. Ecología Microbiana, Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 km 601, Río Cuarto, Córdoba, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
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  • Luciana Ferrari,

    1. Ecología Microbiana, Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 km 601, Río Cuarto, Córdoba, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
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  • Miriam Etcheverry

    Corresponding author
    1. Ecología Microbiana, Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 km 601, Río Cuarto, Córdoba, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
    • Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 km 601 (X5806JRA), Río Cuarto, Córdoba, Argentina
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Abstract

BACKGROUND: The influence of a mixture of butylated hydroxyanisole (BHA) and propyl paraben (PP) (each at a concentration of 20 mmol L−1) on mycoflora and Aspergillus section Flavi populations in stored maize grain was evaluated. A survey of 120 maize samples was carried out from June to November 2005.

RESULTS: The predominant populations in non-treated (control) maize between the first and sixth sampling periods were Aspergillus section Flavi and Penicillium. Aspergillus flavus was the fungus most frequently isolated from both control and antioxidant-treated kernels. All samples of control and antioxidant-treated maize kernels were negative for aflatoxins during the 6 month storage period. Aspergillus flavus and A. parasiticus strains showed a variable ability to produce aflatoxins. The contribution of the strains to silo community toxigenicity was higher for A. flavus L (large) and S (small) strains in the fourth sampling period.

CONCLUSION: Antioxidant treatment negatively affected natural maize mycoflora and Aspergillus section Flavi populations between the second and sixth months of storage. Copyright © 2007 Society of Chemical Industry

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