| AVS 55th International Symposium & Exhibition | |
| Plasma Science and Technology | Thursday Sessions |
| Session PS-ThP |
| Session: | Plasma Science Poster Session |
| Presenter: | T. Mori, Nagoya University, Japan |
| Authors: | T. Mori, Nagoya University, Japan K. Mitamura, Nagoya University, Japan N. Saito, Nagoya University, Japan O. Takai, Nagoya University, Japan |
| Correspondent: | Click to Email |
Some scientists had attempted amino-acid synthesis in order to represent origin of livings. For example, S.L.Miller obtained amino-acid after generating cyanide and aldehyde from discharged mixture gas, which consisted of NH3, CH4, H2 and H2O. This gas is main composition in primitive atmosphere in ancient times. Recently, we had been successful to generate solution plasma, which is one of pulsed discharge phenomenon in the solution. This is nonequilibrium plasma in solution. Thus, we can form cold plasma in the solution. Solution plasma supply many amount of radicals, ions and electrons, and intensive ultraviolet even at room temperature. Such state might be found on the earth, in particular, near seawater surface. In this study, we attempted to synthesize amino-acid by using the solution plasma in C-H-O-N solution system. As first experiments, organic synthesis with solution plasma was conducted in methanol and water system. Solution plasma was generated by using a short-pulsed power supply. After discharge, the ninhydrin solution was added to the obtained solution in order to confirm the formation of amino-acid through ninhydrin reaction. When amino-acid is produced, the color of the solution changes into Ruhemann’s purple. Moreover the product in the solution was analyzed by nuclear magnetic resonance (NMR). While the ratio of methanol to water was varied, the amount of products and their species were investigated in detail. Solution plasma was generated in solution consisting of ethanol and water. Formation of acetaldehyde in the solution was confirmed by silver-mirror reaction and NMR analysis. Formation of CH4, H2 and O2 gases was also confirmed by gas chromatography. The gases might be produced via several recombination reaction between radicals in the solution plasma. Additionally, while the ratio of ethanol to water was varied, the generation amount of CH4 and H2 changed drastically. The variation of ratio has a great influence on excited state and the reaction in the solution plasma. The productants synthesized in other solutions were discussed as same manner.