Effects of alternative energy sources on bacterial cellulose characteristics produced by Komagataeibacter medellinensis

Carlos Molina-Ramírez, Carla Enciso, Mabel Torres-Taborda, Robin Zuluaga, Piedad Gañán, Orlando J. Rojas, Cristina Castro

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    32 Scopus citations


    Bacterial cellulose (BC) was produced by Komagataeibacter medellinensis using Hestrin and Schramm modified medium in the presence of alternative energy sources (AES), such as ethanol and acetic acid, to explore the effect of AES on the characteristics and properties of the resulting BC. In this study, the physicochemical and structural characteristics of the obtained BC were determined using Fourier-transform infrared spectroscopy, X-ray diffraction spectrometry, thermogravimetric analysis, and mechanical testing analysis. Ethanol and acetic acid (at 0.1 wt%) were proven to improve the BC yield by K. medellinensis by 279% and 222%, respectively. However, the crystallinity index (%), the degree of polymerization, and maximum rate of degradation temperatures decreased by 9.2%, 36%, and 4.96%, respectively, by the addition of ethanol and by 7.2%, 27%, and 4.21%, respectively, by the addition of acetic acid. The significance of this work, lies on the fact that there is not any report about how BC properties change when substances like ethanol or acetic acid are added to culture medium, and which is the mechanism that provokes those changes, that in our case we could demonstrate the relationship of a higher BC production rate (provoked by ethanol and acetic acid adding) and changes in BC properties.

    Original languageEnglish
    Pages (from-to)735-741
    Number of pages7
    JournalInternational Journal of Biological Macromolecules
    StatePublished - 1 Oct 2018

    Bibliographical note

    Funding Information:
    The authors acknowledge funding from Research Center for Investigation and Development (CIDI) from the Universidad Pontificia Bolivariana . This study was funded by the Science, Technology and Innovation Administrative Department of the Colombian Government ( COLCIENCIAS ) (grant # 672 of 2014).

    Publisher Copyright:
    © 2018 Elsevier B.V.


    • BC properties
    • Physical characterization
    • Production rate
    • Yield improvement


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