The Stability of Some Selected Amino Acids Under Attempted Redox Constrained Hydrothermal Conditions

  • Eva Andersson
  • Nils G. Holm
Article

Abstract

In order to evaluate the stability of aspartic acid, serine, leucine, and alanine under redox buffered hydrothermal conditions, a series of experiments have been performed. Thepyrite-pyrrhotite-magnetite (PPM) mineral assemblage was used in the experimental systems in order to constrain the oxygen fugacity. Likewise, the K-feldspar-muscovite-quartz (KMQ) assemblage was added to control the hydrogen ion activity during the experiments. The purpose was to compare the relative stabilities in buffered and unbuffered experiments.The experiments were conducted at 200 °C and 50 bar in Teflon coated autoclaves. Glycine, which wasnot present initially, started to appear at an earlystage in the experimental systems and is believed tobe the result of decomposition of serine. Similarly,the increase in relative abundance of alanine is likely to be the result of decomposition of serine. Decomposition rates of leucine, alanine and aspartic acid were found to be lower in experiments containing the redox buffer assemblagepyrite-pyrrhotite-magnetite than in non-redox bufferedexperiments. The decomposition rate of serine washigher in buffered experiments, which indicates thata transformation pathway via dehydration of serine todehydroalanine followed by reduction to alanine ispromoted by reducing conditions.

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Eva Andersson
    • 1
  • Nils G. Holm
    • 2
  1. 1.Department of Geology and GeochemistryStockholm UniversityStockholmSweden
  2. 2.Department of Geology and GeochemistryStockholm UniversityStockholmSweden

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