脂质囊泡壁上的光敏电子传输：量子产率对敏化剂浓度的依赖性。
Photosensitized electron transport across lipid vesicle walls: quantum yield dependence on sensitizer concentration.
作者信息
Ford W E, Otvos J W, Calvin M
出版信息
Proc Natl Acad Sci U S A. 1979 Aug;76(8):3590-3. doi: 10.1073/pnas.76.8.3590.
Abstract
An amphiphilic tris(2,2'-bipyridine)ruthenium(2+) derivative that is incorporated into the walls of phosphatidylcholine vesicles photosensitizes the irreversible oxidation of ethylenediaminetetraacetate(3-) dissolved in the inner aqueous compartments of the vesicle suspension and the one-electron reduction of heptylviologen(2+) dissolved in the continuous aqueous phase. The quantum yield of viologen radical production depends on the phospholipid-to-ruthenium complex mole ratios. A kinetic model is used to derive an order-of-magnitude estimate for the rate constant of electron transport across the vesicle walls. The results are inconsistent with a diffusional mechanism for electron transport and are interpreted in terms of electron exchange.
摘要
一种两亲性的三（2,2'-联吡啶）钌（2+）衍生物被掺入磷脂酰胆碱囊泡壁中，可使溶解在囊泡悬浮液内部水相中的乙二胺四乙酸（3-）发生不可逆氧化，并使溶解在连续水相中的庚基紫精（2+）发生单电子还原。紫精自由基产生的量子产率取决于磷脂与钌配合物的摩尔比。使用动力学模型来推导跨囊泡壁电子传输速率常数的数量级估计值。结果与电子传输的扩散机制不一致，并根据电子交换进行了解释。
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