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Rhamnolipid Modula la Transferencia de Electrones Microbiana Interspecífica para la Sulfidogénesis y Acidogénesis
Hutao Wang1, Xin Shan1, Dongxu Xing1
1College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
Environmental science & technology
|February 6, 2026
Resumen
El ramnolípido (RL) mejora la sulfidogénesis y acidogénesis sincrónicas (SSA) al mejorar la transferencia de electrones microbiana y el equilibrio metabólico. Este biosurfactante mejora la eliminación de contaminantes y la recuperación de recursos de los residuos sólidos de maricultura.
Área de la Ciencia:
- Microbiología Ambiental
- Biotecnología
- Biogeoquímica
Sus antecedentes:
- La sulfidogénesis y acidogénesis sincrónicas (SSA) son vitales para el tratamiento de residuos y la recuperación de recursos.
- La transferencia de electrones ineficiente y el desequilibrio metabólico dificultan el rendimiento de la SSA, especialmente con residuos sólidos de maricultura (MSW) ricos en sulfato.
Objetivo del estudio:
- Investigar el papel y el mecanismo del ramnolípido (RL) en la mejora de la transferencia de electrones microbiana interspecífica para la SSA durante la fermentación anaeróbica de MSW.
- Elucidar cómo el RL modula las comunidades microbianas y las vías metabólicas para mejorar la SSA.
Principales métodos:
- Fermentación anaeróbica de MSW con diversas concentraciones de RL.
- Análisis de rendimientos de sulfuro y ácidos grasos de cadena corta.
- Caracterización de la electroactividad de las sustancias poliméricas extracelulares (EPS).
- Análisis metagenómicos y metatranscriptómicos.
- Investigación de las vías de transferencia de electrones intracelulares.
Principales resultados:
- El RL mejoró significativamente los rendimientos de sulfuro y ácidos grasos de cadena corta.
- El RL mejoró la capacitancia y la electroactividad del EPS, facilitando la transferencia de electrones.
- El RL promovió la formación de pili, la secreción de mediadores redox (flavina y citocromo c) y la transferencia de electrones intracelular a la sulfato reductasa.
- Los datos metagenómicos y metatranscriptómicos confirmaron el enriquecimiento microbiano y la regulación al alza de genes clave relacionados con la SSA.
Conclusiones:
- El ramnolípido juega un papel crucial en la optimización de la SSA al mejorar la transferencia de electrones microbiana y el equilibrio metabólico.
- El mecanismo del RL implica la modulación de las propiedades del EPS, la promoción de lanzaderas de electrones y la activación de vías intracelulares.
- Estos hallazgos ofrecen nuevas perspectivas sobre las aplicaciones de biosurfactantes para mejorar los procesos de tratamiento de residuos y recuperación de recursos.
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