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Isolation and Characterization of Bacteria and Fungi Associated with Agarwood Fermentation

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Abstract

Agarwood oil, often called attar, is a valuable perfume retainer derived from Aquilaria malaccensis. It is obtained through a process of fermentation followed by distillation. The microbes involved in fermentation during agarwood processing have neither been documented nor their role in the process deciphered yet. The present study characterizes the fungi and bacteria engaged in the agarwood fermentation and assesses their colony forming units (CFU) in three categories of agarwood fermentation broth (AFB) collected from three small-scale industries of Hojai, Assam at varying time points. It was interesting to note that grade-A AFB contained the highest CFU count for both bacteria and fungi; the metabolite profile also revealed that the oil obtained from grade-A agarwood comprised of the highest number of compounds. The CFU count increased from 0 to 21 days during fermentation. A total of 105 bacteria and 9 fungi were isolated from 3 different grades of AFB. Shannon index (H' = 0.81) was observed maximum in grade-C AFB and fisher index (α = 2.6) observed maximum for grade-A AFB. The genus Bacillus with a Pi value of 0.61 exhibited dominance among isolated bacteria, while the genus Galactomyces was dominant among fungi with a Pi value of 0.43. The metabolite profiles of three grades of oil obtained after fermentation and one solvent extracted (S.E.) grade agarwood oil analyzed using GC–MS, which showed distinct differences among the oil. The outcomes of this study are expected to create new opportunities for improving oil production methods by modulating biochemical processes involved in fermentation.

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Availability of Data and Material

The genomic DNA sequences of the AFB bacterial and fungal isolates are openly available from the NCBI GenBank database under the accession number MG430354-MG430405 for bacteria and MG396996- MG397001 for fungi.

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Acknowledgements

The authors would like to thank Dr. Mohammad Ghaznavi Idris, Assistant Professor, Department of Bioengineering and Technology, GUIST, Gauhati University, Guwahati, as well as the two anonymous reviewers for their constructive advice in improving the manuscript's quality. MRI also acknowledges the Ministry of Minority Affairs, Govt. of India, for the Maulana Azad National Fellowship.

Funding

This research was supported by the Department of Biotechnology, Government of India, Research (Grant no BT/PR6346/GBD/27/405/2012).

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Authors and Affiliations

  1. Department of Bioengineering and Technology, Gauhati University, Guwahati, Assam, 781014, India

    Md. Rofiqul Islam, Camellia Chakraborty & Sofia Banu

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  1. Md. Rofiqul Islam
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Contributions

SB: Conceptualization, funding acquisition, resources, Editing and Supervision of manuscript, RI: Conducted fieldwork, methodology, statistical analysis, manuscript writing, RI and CC: Experimentation and analysis.

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Correspondence to Sofia Banu.

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All the genomic DNA sequences of the AFB bacterial and fungal isolates are deposited to the NCBI GenBank database (MG430354-MG430405, MG396996- MG397001).

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Islam, M.R., Chakraborty, C. & Banu, S. Isolation and Characterization of Bacteria and Fungi Associated with Agarwood Fermentation. Curr Microbiol 79, 313 (2022). https://doi.org/10.1007/s00284-022-02999-y

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