F. (2004). Adsorption and thermal condensation mechanisms of amino acids on oxide supports. 1.Glycine on Silica. Langmuir, 20:914–923. Stievano, L., Piao,
L. Y., Lopes, I., Meng, M., Costa, D., and Lambert J. F. (2007). Glycine and lysine adsorption and reactivity on the surface of amorphous silica. European Journal of Mineralogy, 19:321–331 E-mail: irene.lopes@upmc.fr Interaction of Amino Acids in Mineral Fludarabine mw Surfaces and Their Relevance in Chemical Evolution L. López-Esquivel Kranksith1, A. Negrón-Mendoza1, G. Cocho-Gil2, S. Ramos-Bernal1 1Instituto de Ciencias Nucleares; 2Instituto de Física Universidad Nacional Autónoma de Mexico (UNAM) Mexico D.F. Laboratory studies have been carried out simulating the chemical evolution stage of the Selleckchem LY3039478 possible conditions on the primitive Earth. Experiments with various solids (silica, clays, and aluminum-silicates) have shown that they could act not only as surfaces of support, but also as catalysts (Ferris and Ertem, 1992). On the other hand, studies of interstellar matter reveal
the presence of complex organic molecules such as polycyclic aromatic hydrocarbons (PAH), fullerenes and carbon nanotubes (CNTs) (Georgakilas, et al. 2000), acetamide (a precursor of amino acids), simple amino acids and sugars. The questions then arise: How these molecules can survival? Which are the mechanisms involved? In an attempt to answer these questions a series of experiments were undertaking with selected Thiazovivin chemical structure compounds and we study the survival of molecules, such as amino acids, in a hostile high radiation field while they are adsorbed environment (Kawasaki, et al., 2006). To this end, we analyzed the adsorption of amino acids in clay mineral, charcoal (PAC) and
carbon nanotubes (CNTs) as possible phases that may ocurred in the primitive Earth or in extraterrestrial environments. We also studied further the behavior of amino acids Reverse transcriptase adsorbed in these solid surfaces, in different conditions of pH, concentration and levels of irradiation, simulating a high radiation field in the early Earth conditions. The analisis of the samples were performed by UV–vis spectroscopy, X-rays and infrared spectroscopy. Trials adsorption with, Aspartic (Asp) and Glutamic (Glu) acids in sodium montmorillonite were conducted for different times of contac. The adsorption for Asp was of 98% and for Glu was of 60%. In the case of Glu, an interest phenomenom took place and interaction with clay generates a visible coloration lemon-yellow in the clay. This may be related to the interactions between cationic links with clay and the molecular structure a this amino acid. It is also important to emphasize that this clay could promote the catalysis of other compounds, using as a precursor Glu. The complex clay-Glu, may form in this condition pyroglutamic acid (2-oxotetrahidropirrol 5-carboxylic acid), a chemical form of internal protection of glutamic acid, which can be obtained relatively easily, from a catalytic dehydration reaction (Yun, et al.