Filamentous fungi producing ochratoxin a during cocoa processing in Cameroon

Mounjouenpou Pauline, Gueule Dominique, Fontana-Tachon Angélique, Guyot Bernard, Tondje Pierre R., Guiraud Joseph-Pierre. 2008. Filamentous fungi producing ochratoxin a during cocoa processing in Cameroon. International Journal of Food Microbiology, 121 (2) : pp. 234-241.

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Abstract : Ochratoxin A (OTA) is the main mycotoxin occurring in cocoa. A study was conducted in Cameroon to assess how filamentous fungi and toxigenesis were affected by the type of cocoa post-harvest treatment (boxes or heaps). The filamentous fungi isolated were almost identical when fermentation was carried out in boxes or heaps, with the presence of abundant black Aspergillus filamentous fungi: A. niger and A. carbonarius. Filamentous fungi were more abundant at the end of the harvesting season. Factors affecting bean integrity (poor handling, deferred processing) resulted in a qualitative and quantitative increase in contamination, when the total number of filamentous fungi could reach a maximum value of 5.5 ± 1.4 × 107 CFU g- 1 and black Aspergilli a maximum value of 1.42 ± 2.2 × 107 CFU g- 1. A toxigenesis study showed that Aspergillus carbonarius was the main OTA-producing strain isolated. Its maximum production could reach 2.77 ?g g- 1 on rice medium. Aspergillus niger strains did not always produce OTA and their toxigenesis was much lower. Fermented dried cocoa from poor quality pods was the most contaminated by OTA: up to 48 ng g- 1. (Résumé d'auteur)

Mots-clés Agrovoc : Ochratoxine, Fève de cacao, Aspergillus niger, Aspergillus, Technologie alimentaire, Qualité, Contamination biologique, Fermentation

Mots-clés géographiques Agrovoc : Cameroun

Mots-clés complémentaires : Aspergillus carbonarius

Classification Agris : Q03 - Food contamination
Q02 - Food processing and preservation

Champ stratégique Cirad : Axe 3 (2005-2013) - Alimentation accessible et de qualité

Auteurs et affiliations

  • Mounjouenpou Pauline, IRAD (CMR)
  • Gueule Dominique, CIRAD-PERSYST-UMR Qualisud (FRA)
  • Fontana-Tachon Angélique, CIRAD-PERSYST-UMR Qualisud (FRA)
  • Guyot Bernard, CIRAD-PERSYST-UMR Qualisud (FRA)
  • Tondje Pierre R., IRAD (CMR)
  • Guiraud Joseph-Pierre

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