Mycobiota of cocoa: From farm to chocolate

Marina V. Copetti, Beatriz T. Iamanaka, Jens Christian Frisvad, José L. Pereira, Marta H. Taniwaki

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The present work was carried out to study the mycobiota of cocoa beans from farm to chocolate. Four hundred and ninety-four samples were analyzed at various stages of cocoa processing: (i) primary stage at the farm (fermentation, drying, and storage), (ii) secondary stage at processing (testa, nibs, liquor, butter, cake and powder) and (iii) the final chocolate product (dark, milk, white and powdered) collected from retail outlets. Direct plating or dilution plating on Dichloran 18% Glycerol agar were used for cocoa beans and processed product analyses, respectively. Fungi were isolated and identified using different keys of identification. The largest numbers and diversity of fungi were observed in the samples collected at the farm, especially during drying and storage. The species with the highest occurrence among samples were: Absidia corymbifera, Aspergillus sp. nov., A. flavus, Penicillium paneum and yeasts. A total of 1132 potentially toxigenic fungi were isolated from the following species or species groups: A. flavus, Aspergillus parasiticus, Aspergillus nomius, Aspergillus niger group, Aspergillus carbonarius and Aspergillus ochraceus group. The highest percentage of toxigenic fungi was found at the drying and storage stages. The industrial processing reduced the fungal contamination in all fractions and no fungi were found in the final chocolate products. The knowledge of which fungi are dominant at each processing stage of cocoa provides important data about their ecology. This understanding leads to a reduction in fungal spoilage and mycotoxin production in this product.
    Original languageEnglish
    JournalFood Microbiology
    Volume28
    Issue number8
    Pages (from-to)1499-1504
    ISSN0740-0020
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Theobroma cacao
    • Cocoa mycobiota
    • Fungi
    • Aspergillus sp.
    • Chocolate
    • Cocoa processing

    Cite this

    Copetti, M. V., Iamanaka, B. T., Frisvad, J. C., Pereira, J. L., & Taniwaki, M. H. (2011). Mycobiota of cocoa: From farm to chocolate. Food Microbiology, 28(8), 1499-1504. https://doi.org/10.1016/j.fm.2011.08.005