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BY-NC-ND 3.0 license Open Access Published by De Gruyter Open Access November 26, 2014

Heterogeneous radiolysis of urea. Implications in astrobiology and prebiotic chemistry

Abigail E. Abigail E. Cruz-Hernández,, Maria Colin-Garcia, Alejandro Heredia-Barbero, Alicia Negron-Mendoza and Sergio Ramos-Bernal
From the journal Open Chemistry

Abstract

Urea is an organic molecule present in most living organisms. Historically, it was the first organic molecule synthesized in the laboratory. In prebiotic chemistry, urea readily forms in different laboratory simulations using different energy sources. Furthermore, the role of solid surfaces, particularly minerals, might have been crucial to increase the complexity of the organic matter which may have led to the subsequent emergence of life on Earth.

In this work, the radiolysis of urea in presence of a clay is studied to determine to what extent the mineral surfaces influence the decomposition of organics. The results indicate that urea is relatively stable to ionizing radiation in aqueous solutions and up to 20 kGy no decomposition is observed. Moreover, the presence of sodium montmorillonite, by a mechanism until now unknown, affects the radiolytic behavior and urea remains in the heterogeneous solution without a change in concentration even at very high doses (140 kGy). These results indicate that solids could have protected some organics, like urea, from degradation enabling them to remain in the environment on the primitive Earth.

Graphical Abstract

References

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Received: 2014-2-28
Accepted: 2014-5-25
Published Online: 2014-11-26

© 2015 Abigail E. Cruz-Hernández et al.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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