AI Article Synopsis
- Heating a 5,5-dimethyl-1-pyrroline N-oxide (DMPO) solution at 70°C for 30 minutes leads to the formation of the DMPO-OH radical, detectable by ESR.
- The presence of an argon atmosphere and the use of ultra-pure water significantly reduce the production of DMPO-OH, with the signal's intensity dropping dramatically compared to aerobic conditions.
- Hydroxyl radical scavengers, such as mannitol, do not influence DMPO-OH formation, while the chelating agent EDTA weakens the signal, indicating that DMPO likely reacts with dissolved oxygen to create DMPO-OH.
Article Abstract
When an aqueous solution of 5,5-dimethyl-1-pyrroline N-oxide (DMPO) was heated at 70 degrees C for 30 min, formation of DMPO-OH was observed by ESR. This DMPO-OH radical formation was suppressed under an argon atmosphere. When water was replaced with ultra-pure water for ICP-MS experiments, DMPO-OH radical formation was also diminished. Under an argon atmosphere in ultra-pure water, the intensity of the DMPO-OH signal decreased to about 1/20 of that observed under aerobic conditions with regular purified water. The addition of hydroxyl radical scavengers such as mannitol did not affect the formation of DMPO-OH, but the signal turned faint in the presence of EDTA. We suggest that DMPO reacted with dissolved oxygen to form DMPO-OH.
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| http://dx.doi.org/10.2116/analsci.23.219 | DOI Listing |
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