Journal of Clinical Biochemistry and Nutrition
Online ISSN : 1880-5086
Print ISSN : 0912-0009
Original Articles
Free radical formation from sonolysis of water in the presence of different gases
Masahiro KohnoTakayuki MokudaiToshihiko OzawaYoshimi Niwano
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2011 Volume 49 Issue 2 Pages 96-101

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Abstract

In the present study by applying electron spin resonance-spin trapping method, when a high frequency (1650 kHz) ultrasound was irradiated to water dissolved with different gas molecules (O2, N2, Ar, Ne, He, and H2) at 25°C of water bulk temperature, free radical generation pattern differed dependently on the dissolved gas molecules. Only OH was detected in the O2-dissolved water sample, and the amount of the radical was much greater than that determined in any of other gas-dissolved water samples. One of the possible reasons to explain why the H radical was not detected in the O2-dissolved water is that the H reacts with O2 to form OOH. However, no electron spin resonance signals related to the adduct of not only 5,5-dimethyl-1-pyrroline-N-oxide but 5-(2,2-Dimethyl-1,3-propoxy cyclophosphoryl)-5-methyl-1-pyrroline N-oxide and OOH were observed. In the H2-dissolved water, only H was detected, suggesting that H2 reduces or neutralizes OH. In the N2-disolved water, both OH and H were detected at comparable level. In the water samples dissolved with rare gases (Ar, Ne, and He), the amount of H was almost double as compared with that of OH, and both OH and H yields increased in the order Ar > Ne > He.

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© 2011 by The Editorial Secretariat of JCBN
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