Reaction Behaviors of Glycine under Super- and Subcritical Water Conditions

Details Reaction Behaviors of Glycine under Super- and Subcritical Water Conditions Reaction Behaviors of Glycine under Super- and Subcritical Water Conditions

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002oleb...32....1a&link_type=abstract

Origins of Life and Evolution of the Biosphere, v. 32, Issue 1, p. 1-12 (2002).

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8

Glycine, High Pressure, High Temperature, Hydrothermal System, Oligomerization, Origin Of Life, Supercritical Water

Scientific paper

The influence of temperature and pressure on the dimerization and decomposition of glycine under simulated hydrothermal system conditions was studied by injecting a glycine solution into water in the sub- and supercritical state. The experiments at five different temperatures of supplied water - 250, 300, 350, 374, and 400 °C - were performed at 22.2 and 40.0 MPa. At 350 °C, experiments under 15.0-40.0 MPa were conducted. Diglycine, triglycine (trace), diketopiperazine, and an unidentified product with a high molecular mass (433 Da) were the main products of oligomerization. The results show that temperature and pressure influence the extent of dimerization and decomposition of glycine. The maximum of dimers formation was observed at 350 and 375 °C at 22.2 and 40.0 MPa, respectively, and coincided with a high rate of glycine decomposition. Glycine, alanine, aspartic acid, as well as other amino acids, were obtained by injecting a mixture of formaldehyde and ammonia. The results support the oligomerization and synthesis of amino acids in a submarine hydrothermal system.

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