UV protection and singlet oxygen quenching activity of aloesaponarin I.
UV protection and singlet oxygen quenching activity of aloesaponarin I.
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DOI：
10.1021/jp075224j
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发表时间：
2007-10
期刊：
影响因子：
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通讯作者：
S. Nagaoka;A. Fujii;M. Hino;Mai Takemoto;Misaki Yasuda;Mariko Mishima;K. Ohara;Akane Masumoto;H. Uno;U. Nagashima
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文献类型：
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作者：
S. Nagaoka;A. Fujii;M. Hino;Mai Takemoto;Misaki Yasuda;Mariko Mishima;K. Ohara;Akane Masumoto;H. Uno;U. Nagashima
采用激光光谱技术研究了芦荟皂苷I的紫外防护和单线态氧猝灭作用。提供紫外线防护的激发态分子内质子转移仅沿着分子的两个分子内氢键之一发生，这可以通过考虑波函数的节点模式来理解。参与激发态分子内质子转移的官能团在单线态氧猝灭中也发挥着重要作用。芦荟皂苷 I 的猝灭速率常数大于维生素 E，并且由于其抵抗紫外线降解以及单线态氧和自由基的化学攻击而具有较长的作用持续时间。
The UV protection and singlet oxygen quenching of aloesaponarin I have been studied by means of laser spectroscopy. The excited-state intramolecular proton transfer that provides the UV protection takes place along only one of the molecule's two intramolecular hydrogen bonds, and this can be understood by considering the nodal pattern of the wave function. The functional groups participating in the excited-state intramolecular proton transfer also play important roles in the singlet oxygen quenching. Aloesaponarin I has a quenching rate constant larger than that of vitamin E and has a long duration of action due to its resistance to UV degradation and chemical attacks by singlet oxygen and free radicals.