Conducting Miller-Urey experiments

Parker, ET, Cleaves JH, Burton AS, Glavin DP, Dworkin JP, Zhou MS, Bada JL, Fernandez FM.  2014.  Conducting Miller-Urey experiments. Jove-Journal of Visualized Experiments.

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amino acids, atmospheres, chemistry, exobiology, Geosciences (General), irradiation, Issue 83, liquid-chromatography, Miller-Urey, organic-compounds, prebiotic chemistry, prebiotic synthesis, primitive earth, protein amino-acids, Spark discharge, spark discharge experiment


In 1953, Stanley Miller reported the production of biomolecules from simple gaseous starting materials, using an apparatus constructed to simulate the primordial Earth's atmosphere-ocean system. Miller introduced 200 ml of water, 100 mmHg of H-2, 200 mmHg of CH4, and 200 mmHg of NH3 into the apparatus, then subjected this mixture, under reflux, to an electric discharge for a week, while the water was simultaneously heated. The purpose of this manuscript is to provide the reader with a general experimental protocol that can be used to conduct a Miller-Urey type spark discharge experiment, using a simplified 3 L reaction flask. Since the experiment involves exposing inflammable gases to a high voltage electric discharge, it is worth highlighting important steps that reduce the risk of explosion. The general procedures described in this work can be extrapolated to design and conduct a wide variety of electric discharge experiments simulating primitive planetary environments.