Abstract
In this comprehensive study, we delved into the capabilities of five fungal strains: Aspergillus flavus, Aspergillus niger, Penicillium chrysogenum, Penicillium glabrum, and Penicillium rubens (the latter isolated from heavy crude oil [HCO]) in metabolizing HCO as a carbon source. Employing a meticulously designed experimental approach, conducted at room temperature (25 °C), we systematically explored various culture media and incubation periods. The results unveiled the exceptional resilience of all these fungi to HCO, with A. flavus standing out as the top performer. Notably, A. flavus exhibited robust growth, achieving a remarkable 59.1% expansion across the medium’s surface, accompanied by distinctive macroscopic traits, including a cottony appearance and vibrant coloration. In an effort to further scrutinize its biotransformation prowess, we conducted experiments in a liquid medium, quantifying CO2 production through gas chromatography, which reached its zenith at day 30, signifying substantial bioconversion with a 38% increase in CO2 production. Additionally, we monitored changes in surface tension using the Du Noüy ring method, revealing a reduction in aqueous phase tension from 72.3 to 47 mN/m. This compelling evidence confirms that A. flavus adeptly metabolizes HCO to fuel its growth, while concurrently generating valuable biosurfactants. These findings underscore the immense biotechnological potential of A. flavus in addressing challenges related to HCO, thereby offering promising prospects for bioremediation and crude oil bioupgrading endeavors.
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Acknowledgements
We extend our sincere gratitude to the Agencia Nacional de Investigación y Desarrollo (ANID), for generously funding this research project. We also wish to express our appreciation to the Pontificia Universidad Católica de Chile (PUC) and the Empresa Nacional del Petróleo de Chile (ENAP) for their invaluable contributions in providing the heavy crude oil samples that were instrumental in making this study a reality. Their support and collaboration were indispensable to the success of this research endeavor.
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This work was supported by the Chilean national research and development agency ANID, through the covenant 3617/2021.
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All authors contributed to the conception and design of the study. JZC-Z prepared the materials, collected and analyzed the data, performed the experiments, and wrote the first draft. LAR-C and CAS-N were responsible for the adaptation and improvement of the methodology, as well as the supervision of the inputs. YCR checked the data graphics and statistical analysis. All authors commented on earlier versions of the manuscript and read and approved the final manuscript.
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Cáceres-Zambrano, J.Z., Rodríguez-Córdova, L.A., Sáez-Navarrete, C.A. et al. Biodegradation capabilities of filamentous fungi in high-concentration heavy crude oil environments. Arch Microbiol 206, 123 (2024). https://doi.org/10.1007/s00203-024-03835-6
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DOI: https://doi.org/10.1007/s00203-024-03835-6