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• W2049275800 startingPage "6285" @default.
• W2049275800 abstract "Polymerizations of organic monomers including amino acids, nucleotides and monosaccharides are essential processes for chemical evolution of life. Since these reactions proceed with “dehydration” reactions, they are possibly promoted if combined with thermodynamically favorable “hydration” reactions of minerals and salts. To test the possibility, we conducted heating experiments of the simplest amino acid “glycine (Gly)” mixed with four simple anhydrous salts (MgSO 4 , SrCl 2 , BaCl 2 and Li 2 SO 4 ) at 140 °C up to 20 days. Gly polymerization was strongly promoted by mixing with the salts in the order of MgSO 4 > SrCl 2 > BaCl 2 > Li 2 SO 4 . Up to 6-mer of Gly polymers were synthesized in the Gly–MgSO 4 mixture, and a total yield of Gly polymers attained about 7% of the initial amount of Gly by the 20 days heating. The total yield was about 200 times larger than that from the heating of Gly alone. XRD measurements of the Gly–MgSO 4 mixture revealed the generation of MgSO 4 monohydrate during Gly polymerization. These observations indicate that Gly polymerization was promoted by the salt hydrations through the hydration–dehydration interactions. Based on the observations, we tried to find a relationship between thermodynamic characteristics of the interactions and the promotion effects of each salt on Gly polymerization. It was found that the salts having lower hydration Δ r G 0 (easier to hydrate) promote Gly polymerization more strongly. The relationship was used to estimate promotion effects of simple oxide minerals on Gly polymerization. The estimations were consistent with previous observations about the effects of these minerals on Gly polymerization. The fact suggests that the hydration–dehydration interactions between amino acids and minerals are an important mechanism for amino acids’ polymerizations on minerals." @default.
• W2049275800 created "2016-06-24" @default.
• W2049275800 creator A5026142377 @default.
• W2049275800 creator A5050764191 @default.
• W2049275800 creator A5056561389 @default.
• W2049275800 date "2011-11-01" @default.
• W2049275800 modified "2023-09-27" @default.
• W2049275800 title "Hydration–dehydration interactions between glycine and anhydrous salts: Implications for a chemical evolution of life" @default.
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• W2049275800 doi "https://doi.org/10.1016/j.gca.2011.08.027" @default.
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