Subcritical water extraction of amino acids from Atacama Desert soils
نویسندگان
چکیده
منابع مشابه
Subcritical water extraction of amino acids from Atacama Desert soils
[1] Amino acids are considered organic molecular indicators in the search for extant and extinct life in the Solar System. Extraction of these molecules from a particulate solid matrix, such as Martian regolith, will be critical to their in situ detection and analysis. The goals of this study were to optimize a laboratory amino acid extraction protocol by quantitatively measuring the yields of ...
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For decades, the Martian regolith has stymied robotic mission efforts to catalog the organic molecules present. Perchlorate salts, found widely throughout Mars, are the main culprit as they breakdown and react with organics liberated from the regolith during pyrolysis, the primary extraction technique attempted to date on Mars. This work further develops subcritical water extraction (SCWE) as a...
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Subcritical water extraction (SWE) of essential oil from Matricaria Chamomilla L. (M. Chamomilla L.) was performed and compared with conventional method including hydro distillation. The percentage of main extracted components of different temperatures (100, 125, 150 and 175 oc) and water flow rates (1, 2 and 4 ml/min) were investigated at 20 bar pressure and 0.50 mm mean particle size in SWE....
متن کاملDegradation kinetics of branched-chain amino acids in subcritical water.
The degradation of branched-chain amino acids (valine, leucine, and isoleucine) in subcritical water was measured from 290 degrees C to 330 degrees C. The degradation process at any temperature obeyed first-order kinetics. The energy of activation for the degradation of each amino acid could be estimated according to the Arrhenius equation. The pH value of the reaction mixture increased during ...
متن کاملImplications of the Presence of Surface Perchlorate for in Situ Detection of Organic Compounds during Future Missions
Introduction: One crucial discovery by the 2009 NASA Phoenix Lander was the detection of perchlorate at ~1% in the surface Martian regolith [1]. High concentrations of perchlorate may oxidize organics on Mars and be problematic during extraction of organics during future in situ investigations. High temperature pyrolytic extraction methods will likely result in catalytic degradation of organics...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Biogeosciences
سال: 2007
ISSN: 0148-0227
DOI: 10.1029/2006jg000308