Vol. 24, No. 1 (2025), Bio24332 https://doi.org/10.24275/rmiq/Bio24332


Biodegradation of crude oil by Aspergillus tubingensis: biosurfactant-producing strain


 

Authors

D.L. Peraza-Liñan, B.A. Ayíl-Gutiérrez, A.A. Urías-Salazar, J.A. López-Santillán, B. Estrada-Drouaillet, M.T.J. Segura-Martínez, W.A. Poot-Poot


Abstract

Crude oil is one of the most demanded fuels which causes an increase in environmental pollution due to spills. Bioremediation by hydrocarbonoclast microorganisms can be an alternative for hydrocarbon degradation through biochemical processes involving enzymes and biosurfactants. The objective of this work was to evaluate the capacity of oil biodegradation by a hydrocarbonoclast strain through growth kinetics and biosurfactant production. The strain was inoculated in flasks with mineral medium (MM) supplemented with oil (0, 20, 40, 60, and 80 %) and grown for 20 days. The variables evaluated were oil degradation by Soxhlet extraction, quantification of extracellular proteins, proteolytic activity, biosurfactant production by lysis in blood agar and emulsification capacity (E24).  The results allow concluding that the strain identified as Aspergillus tubingensis was able to biodegrade 78.38 % of the crude oil at the 80 % concentration and maintain a biomass production of 55.12 g/L, a low proteolytic activity of 0.0015 U/mL, as well as biosurfactant production and an E24 of 65.16 %. Therefore, A. tubingensis can be used in bioremediation works to recover oil contaminated sites.


Keywords

Bioremediation, Hydrocarbons, Filamentous Fungi, Biosurfactants, Growth Kinetics.


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