| Project/Area Number |
62550604
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
有機工業化学
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| Research Institution | Department of Reaction Chemistry, Faculty of Engineering The University of Tokyo |
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Principal Investigator |
TAMURA Masamitsu Dept. of Reaction Chemistry, Faculty of Engineering The University of Tokyo Associate Professor, 工学部, 助教授 (30114557)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1988: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1987: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | cigarette smoke / combustion of polymer / gas-phase radical / spin-trapping / ESR / スピントラッピング |
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| Research Abstract |
We have studied any possibility for the production of gas-phase radicals from cigarette smoke and from the combustion of petroleum and other various materials which may lead to free-radical damage.
As a result, apparently long-lived and highly reactive oxygen-centered radicals have been detected in cigarette smoke and their production behaviour has been observed using the electron-spin resonance spin-trapping technique. It is suggested from a study using the computer simulation technique on the reaction system that an olefin-NOx-air reaction system can explain mainly the production behaviour of radicals in cigarette smoke.
On the other hand, much longer-lived and highly reactive oxygen- and carbon-centered radicals have been detected in the smoke from various materials such as petroleum and polymers and their production behaviour has been observed using the same method. The radicals can also be detected in the system not containing a nitrogen component to produce NOx by oxidation. Moreover, a remarkable increase in the ESR signal for the sample trapped at -78 ゜C is observed at about -30 ゜C possibly due to the decomposition of meta-stable species such as trioxides which may be produced by recombination of alkoxy radicals and peroxy radicals in the smoke. Therefore, it is suggested that a production mechanism for the radicals from the combustion of petroleum and polymers should be different from that for the radicals from cigarette smoke and that the mechanism may be one involving the formation and decomposition of meta-stable species such as trioxides and teraoxides as intermediates.
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