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Updated: Sep 13, 2025
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Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment
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Reducción de carbono impulsada por gradientes electroquímicos naturales bajo condiciones de ventilación hidrotermal
Journal of the American Chemical Society
|July 29, 2025
Resumen
Las fuentes hidrotermales alcalinas pueden haber iniciado la vida facilitando el metabolismo energético y la fijación de carbono. Los investigadores simularon las condiciones de ventilación y descubrieron que los minerales [Ni-]FeS pueden catalizar pasos clave en antiguas vías metabólicas como la vía Wood-Ljungdahl.
Área de la Ciencia:
- El origen de los estudios de la vida
- Geoquímica y bioquímica
- Astrobiología
Sus antecedentes:
- Los respiraderos hidrotermales alcalinos (AHV) son ambientes propuestos para el origen de la vida.
- Los gradientes de pH en los AHV pueden haber precedido a las membranas celulares.
- Los minerales [Ni-]FeS están implicados como precursores de las metalloenzimas en las primeras vías metabólicas.
Objetivo del estudio:
- Investigar la reducción de CO2 a formato y acetato en condiciones simuladas de AHV.
- Explorar el papel de los minerales [Ni-]FeS en la catalización de las etapas clave de la vía Wood-Ljungdahl (WL).
- Determinar la influencia de la composición mineral, la temperatura y las corrientes eléctricas en la reducción de CO2.
Principales métodos:
- Utilizó un reactor a gran escala que imitaba la formación de una chimenea hidrotermal.
- Se emplean simulaciones experimentales y técnicas electroquímicas.
- Minerales sintetizados utilizando protocolos diseñados para replicar los procesos hidrotermales naturales.
Principales resultados:
- Se han detectado con éxito dos etapas clave de la vía WL: CO2 a ácido fórmico y formación de ácido acético.
- Se ha demostrado que los minerales [Ni-]FeS, en particular con incorporación de Ni, catalizan estas reacciones.
- Se demostró una reducción eficiente de CO2 con corrientes tan bajas como 10 nanoamperios a 10 microamperios, influenciadas por el tipo de mineral y la temperatura.
Conclusiones:
- Las interfaces de AHV con los minerales [Ni-]FeS proporcionan un entorno viable para la transducción de energía protometabólica y la fijación de carbono.
- Estos hallazgos apoyan la hipótesis de que los catalizadores minerales inorgánicos en los primeros entornos de la Tierra facilitaron el surgimiento del metabolismo biológico.
- El estudio destaca el potencial para el protometabolismo impulsado electroquímicamente en sistemas de ventilación extraterrestres.
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