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Aislamiento y caracterización de bacterias endémicas colombianas con capacidad de degradar tolueno
Isolation and characterization of Colombian endemic bacteria capable of degrading toluene
DOI:
https://doi.org/10.15446/rev.colomb.biote.v24n1.98613Palabras clave:
biodegradación, biorremediación BTEX, compuesto xenobiótico, crecimiento, Pseudomonas (es)español, biodegradation, bioremediation, growth, Pseudomonas, xenobiotic compounds (en)
Los hidrocarburos aromáticos monocíclicos: benceno, tolueno, etilbenceno y xileno (BTEX), presentes en crudo y refinados de petróleo, hacen parte de los compuestos con más impacto en el medio ambiente y la salud humana, debido a su naturaleza cancerígena, mutagénica y altamente tóxica. Esta investigación tuvo como objetivo obtener y caracterizar bacterias capaces de degradar tolueno. Se realizaron tres muestreos de suelo contaminado con hidrocarburos del Valle del Cauca en tres condiciones: gasolinería, derrame accidental y taller mecánico. Se aislaron bacterias capaces de crecer en tolueno vapor como única fuente de carbono y se caracterizaron a nivel morfológico, bioquímico y molecular. Para la caracterización molecular se amplificó, secuenció y analizó con herramientas bioinformáticas el gen ribosomal 16S. Se evaluó la utilización de tolueno directo con concentración al 1% como única fuente de carbono. Se logró aislar 29 bacterias con capacidad de metabolizar tolueno. La caracterización bioquímica y molecular identificó a las bacterias aisladas de suelo contaminado como Pseudomonas y Stenotrophomonas. Las bacterias aisladas en el taller mecánico resultaron ser los microorganismos con mejor crecimiento en tolueno como fuente de carbono, poseen un gran potencial para ser utilizadas para fines de biorremediación de suelos y aguas contaminadas con BTEX.
Monocyclic aromatic hydrocarbons: benzene, toluene, ethylbenzene, and xylene (BTEX), present in crude oil and refined petroleum products, they are the compounds with a big impact on the environment and human health, due to their carcinogenic, mutagenic, and highly toxic. This research aimed to obtain and characterize bacteria capable of degrading toluene. Three samples of soil contaminated with hydrocarbons were carried out in three different conditions: oil station, accidental oil spill, and mechanical workshop. Bacteria capable of growing in toluene vapor as the unique carbon source were isolated and characterized at a morphological, biochemical, and molecular level. For molecular characterization, the 16S ribosomal gene was amplified, sequenced, and analyzed with bioinformatic tools. The use of direct toluene with 1% concentration as the sole carbon source was evaluated. It was possible to isolate 29 bacteria with the capacity to metabolize toluene. Biochemical and molecular characterization identified bacteria isolated from contaminated soil as Pseudomonas and Stenotrophomonas. The isolated strains in the mechanical workshop were the microorganisms with the best growth in toluene as a carbon source, they have great potential to be used for the bioremediation of soils and waters with toluene pollution.
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