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Identification of predominant yeasts associated with artisan Mexican cocoa fermentations using culture-dependent and culture-independent approaches

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Abstract

The process of cocoa fermentation is a very important step for the generation or aromatic compounds, which are attributable to the metabolism of the microorganisms involved. There are some reports about this process and the identification of microorganisms; however, there are no reports identifying the yeasts involved in a Mexican cocoa fermentation process using molecular biology techniques, including restricted fragment length polymorphism (RFLP) and denaturing gradient gel electrophoresis (DGGE). The aim of this study was to identify the main yeast species associated with Mexican cocoa fermentations employing culture-dependent and -independent techniques achieving two samplings with a 1 year time difference at the same site. Isolation of the microorganisms was performed in situ. Molecular identification of yeast isolates was achieved by RFLP analysis and rDNA sequencing. Total DNA from the microorganisms on the cocoa beans was utilized for the DGGE analysis. Bands from the DGGE gels were excised and sequenced. Nineteen isolated yeasts were identified (al specie level), three of which had never before been associated with cocoa fermentations worldwide. The detected predominant yeast varied from one technique to another. Hanseniaspora sp. resulted dominant in DGGE however Saccharomyces cerevisiae was the principal isolated species. In conclusion, the culture-dependent and -independent techniques complement each other showing differences in the main yeasts involved in spontaneous cocoa fermentation, probably due to the physiological states of the viable but non culturable yeasts. Furthermore important differences between the species detected in the two samplings were detected.

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Acknowledgments

We would like to thank Mr. Samuel Hernández-Méndez for providing us with total access to Beneficiadora No. 22 (Cunduacán, Tabasco, Mexico) in order to accomplish the goals of this work, the Mexican Secretaría de Agricultura, Ganadería, Desarrollo Rural, Pesca y Alimentación (SAGARPA) for financing the 49078 project, and the Consejo Nacional de Ciencia y Tecnología (CONACYT) for providing the scholarships for the students involved in this project.

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  1. Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco (CIATEJ), A.C., Av. Normalistas 800, CP 44270, Guadalajara, Jalisco, Mexico

    A. Arana-Sánchez, L. E. Segura-García, M. Kirchmayr, I. Orozco-Ávila, E. Lugo-Cervantes & A. Gschaedler-Mathis

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  1. A. Arana-Sánchez
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  2. L. E. Segura-García
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  3. M. Kirchmayr
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  4. I. Orozco-Ávila
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  5. E. Lugo-Cervantes
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  6. A. Gschaedler-Mathis
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Correspondence to A. Gschaedler-Mathis.

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Arana-Sánchez, A., Segura-García, L.E., Kirchmayr, M. et al. Identification of predominant yeasts associated with artisan Mexican cocoa fermentations using culture-dependent and culture-independent approaches. World J Microbiol Biotechnol 31, 359–369 (2015). https://doi.org/10.1007/s11274-014-1788-8

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  • DOI: https://doi.org/10.1007/s11274-014-1788-8

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