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- W2366562233 abstract "The study on the performance of amino acid adsorption, activation and thermal condensation on inorganic oxides is helpful to make clear the essential function of silica, alumina and clay during the prebiotic chemical evolution, such as the formation of peptide bonds. In this work, the adsorption and thermal condensation performance of glycine on silica were investigated. Glycine was adsorbed on the surface of silica from aqueous solutions with various concentrations and pHs, and the samples were characterized by DTG, XRD, FT-IR and TPD-MS. It is shown by DTG results that the adsorption performance does not meet the Langmuir model. XRD and FT-IR results indicate that when the equilibrium concentration is below 0 073 mol/L, the adsorption may take place only on specific sites; and it is probably resulted from the interaction between the NH~+_3 moiety of glycine and the silanolate group (≡Si-O~-) of silica. At higher equilibrium concentrations (0 073 mol/L), the precipitation of β -glycine on silica surface was observed. The adsorbed or deposited glycine molecules react with each other to form peptide bonds at 166～220 ℃, which is considerably lower than that of pure α -glycine (240～250 ℃). The main product of the thermal condensation reaction is cyclodimer diketopiperazine (DKP), no linear dimer and surface acyl species were detected. The reconstruction of hydrogen bonds in the adsorbed glycine molecules makes the condensation reaction proceeded easier. Additionally, the product DKP on silica can be totally degradated below 600 ℃ in the oxidative atmosphere,while the DKP produced from bulk glycine is difficult to be degradated without silica under the same condition." @default.
- W2366562233 created "2016-06-24" @default.
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- W2366562233 date "2005-01-01" @default.
- W2366562233 modified "2023-09-26" @default.
- W2366562233 title "Adsorption and Thermal Condensation of Glycine on SiO_2" @default.
- W2366562233 hasPublicationYear "2005" @default.
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