Electron Spin Resonance of Ascorbyl (Vitamin C) Radicals in Synthetic CaCO3 by UV Irradiation
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概要
- 論文の詳細を見る
Free radicals ascribed to ascorbic acid (AscH2), vitamin C, in the solid matrix of synthetic calcium carbonate have been studied using electron spin resonance (ESR) after UV irradiation. A new ESR signal with $g$-factors of $g_{\|}=2.0024$ and $g_{\bot}=2.0053$ was found together with a broad singlet signal around $g=2.005$ and a doublet signal at $g=2.0053$ separated by 0.18 mT due to the ascorbyl radical (Asc•-). The molecular orbitals of Asc•- and two other types of ascorbyl radical (AscH•-) were calculated using the semi-empirical PM3 unrestricted Hartree–Fock (UHF) method, which indicated that the hyperfine splitting due to hydrogen bonded to one of the carbons in the pentagonal ring was dominant. The axial signal was ascribed to AscH•-, while the doublet signal was ascribed to Asc•- in CaCO3. Possible pharmaceutical and nutritional applications of embedding unstable active molecules into the crystalline lattice of CaCO3 and a new nondestructive method for determination of vitamin C contents are discussed because the vitamin C has higher thermal stability in the carbonate than that in aqueous solution.
- Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
- 2003-02-15
著者
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Ikeya Motoji
Department Of Earth And Space Science Faculty Of Science Osaka University
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Tani Atsushi
Department Of Chemistry Graduate School Of Science Hiroshima University
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Sato Hideo
Department Of Anesthesiology Aichi Children's Health And Medical Center
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Ikeya Motoji
Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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Tani Atsushi
Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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Sato Hideo
Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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