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Environ Technol. 2018 Dec 31:1-23. doi: 10.1080/09593330.2018.1564798. [Epub ahead of print]

Biodegradation of biodiesel-oil by Cellulosimicrobium sp. Isolated from Colombian Caribbean soils.

Author information

1
a Environmental and Computational Chemistry Group, School of Pharmaceutical Sciences, Zaragocilla Campus , University of Cartagena , Cartagena , 130014, Colombia .
2
b Centro Nacional de Secuenciación Genómica-CNSG, Sede de Investigación Universitaria-SIU , Universidad de Antioquia , Colombia .

Abstract

Biodiesel is considered to be a natural substitute for fossil fuel. The comparatively low toxicity of biodiesel and its susceptibility to microbial biodegradation could reduce its environmental impact. Currently, biodiesel is sold previously mixed with petroleum-based hydrocarbons. The aim of this work was to measure the biodegradation potential of commercially available biodiesel, using bacterial strains (BBCOL-001, BBCOL-002, and BBCOL-003) isolated from a tropical forest soils in the Colombian Caribbean. According to nucleotide sequencing of the gene encoding for 16S rRNA, the strains belong to members of the genus Cellulosimicrobium. GC-MS analysis showed that biodiesel-oil alkanes were degraded by an average of 81.5% with optical density reaching 0.2 to 0.3 in minimal salt media at 37 °C for 5 days. Individual diesel-oil alkanes were degraded by the strains at rates between 64.9% to 100%. The increase in bacterial biomass confirmed the use of the substrates by the microorganisms, suggesting these hydrocarbons are a carbon source. Changes in the biochemical behavior of the strains suggested their capacity to adapt to environmental conditions might be an important resource for bioremediation.

KEYWORDS:

Bacteria; bioremediation; cellulolytic; hydrocarbons; petroleum

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