Maguy Jaber

Abstract The formation of nucleosides in abiotic conditions is a major hurdle in origin-of-life studies. We have determined the pathway of a general reaction leading to the one-pot synthesis of ribo- and 2′-deoxy-ribonucleosides from sugars and purine nucleobases under proton irradiation in the presence of a chondrite meteorite. These conditions simulate the presumptive conditions in space or on an early Earth fluxed by slow protons from the solar wind, potentially mimicking a plausible prebiotic scenario. The reaction (i) requires neither pre-activated precursors nor intermediate purification/concentration steps, (ii) is based on a defined radical mechanism, and (iii) is characterized by stereoselectivity, regioselectivity and (poly)glycosylation. The yield is enhanced by formamide and meteorite relative to the control reaction.

Glycosidic bond

Prebiotic

10.1038/s41598-017-15392-8

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Conspiration of minerals and organics in origins of life

Maguy Jaber

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Physico-chemical characterization of lake pigments based on montmorillonite and carminic acid

Applied Clay Science (2016)

Frédéric Fournier Laurence de Viguerie Sebastien Balme Jean‐Marc Janot Philippe Walter

10.1016/j.clay.2016.01.046

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Citations (49)

The degradation of organic compounds impacts the crystallization of clay minerals and vice versa

Scientific Reports (2019)

Pierre Jacquemot Jean‐Christophe Viennet Sylvain Bernard Corentin Le Guillou Baptiste Rigaud

Expanding our capabilities to unambiguously identify ancient traces of life in ancient rocks requires laboratory experiments to better constrain the evolution of biomolecules during advanced fossilization processes. Here, we submitted RNA to hydrothermal conditions in the presence of a gel of Al-smectite stoichiometry at 200 °C for 20 days. NMR and STXM-XANES investigations revealed that the organic fraction of the residues is no longer RNA, nor the quite homogeneous aromatic-rich residue obtained in the absence of clays, but rather consists of particles of various chemical composition including amide-rich compounds. Rather than the pure clays obtained in the absence of RNA, electron microscopy (SEM and TEM) and diffraction (XRD) data showed that the mineralogy of the experimental residues includes amorphous silica and aluminosilicates mixed together with nanoscales phosphates and clay minerals. In addition to the influence of clay minerals on the degradation of organic compounds, these results evidence the influence of the presence of organic compounds on the nature of the mineral assemblage, highlighting the importance of fine-scale mineralogical investigations when discussing the nature/origin of organo-mineral microstructures found in ancient rocks.

10.1038/s41598-019-56756-6

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ZnO-Saponite Nanocomposite: Input of Adsorption and Photocatalysis for Removal of Rhodamine B Dye

Water Air & Soil Pollution (2024)

Dihêgo H. Damaceno Pollyana Trigueiro Luciano Clécio Brandão Lima Luzia Maria Castro Honório R. Peña‐Garcia

Saponite

Rhodamine B

Alum

Rhodamine

10.1007/s11270-024-07456-z

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