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Bada, JL, Miller SL, Zhao MX.  1995.  The Stability of Amino-Acids at Submarine Hydrothermal Vent Temperatures. Origins of Life and Evolution of the Biosphere. 25:111-118.   10.1007/bf01581577   AbstractWebsite

It has been postulated that amino acid stability at hydrothermal vent temperatures is controlled by a metastable thermodynamic equilibrium rather than by kinetics. Experiments reported here demonstrate that the amino acids are irreversibly destroyed by heating at 240 degrees C and that quasi-equilibrium calculations give misleading descriptions of the experimental observations. Equilibrium thermodynamic calculations are not applicable to organic compounds under high-temperature submarine vent conditions.