Markovic D Z, Patterson L K
Radiation Laboratory, University of Notre Dame, IN 46556.
Photochem Photobiol. 1993 Sep;58(3):329-34. doi: 10.1111/j.1751-1097.1993.tb09569.x.
Benzophenone-photosensitized peroxidation in linoleic acid micelles (Type I reaction) has been investigated and quantum yields of both sensitizer photolysis and lipid peroxidation have been obtained. Benzophenone as well as its derivative, benzophenone-4'-heptyl-4-pentanoic acid (BHPA) have been utilized as sensitizers in this study. A quantum yield of 1.2 for hydroperoxide formation, compared with a benzophenone disappearance quantum yield of 0.41 (in the same linoleate micellar solution) was obtained; yields of 1.3 and 0.6 were found for comparable systems in which BHPA was the sensitizer. Although such data are consistent with the peroxidation mechanism of chain reaction, it is necessary to know the yields of initiating species to arrive at chain reaction lengths in these systems. Such yields have been determined by flash photolysis. The dependencies of sensitizer photolysis and hydroperoxide yields on linoleate concentration have also been determined in order to elucidate the effects of micelle formation or molecular organization on the peroxidative process. Additionally, for comparison in a saturated surfactant (lipid) system hydrogen abstraction was investigated by photolysis techniques in sodium dodecyl sulfate alone using these two sensitizers.
已经研究了二苯甲酮在亚油酸胶束中的光敏过氧化反应（I型反应），并获得了敏化剂光解和脂质过氧化的量子产率。在本研究中，二苯甲酮及其衍生物二苯甲酮-4'-庚基-4-戊酸（BHPA）被用作敏化剂。在相同的亚油酸酯胶束溶液中，获得了氢过氧化物形成的量子产率为1.2，而二苯甲酮消失的量子产率为0.41；在以BHPA为敏化剂的类似体系中，产率分别为1.3和0.6。尽管这些数据与链反应的过氧化机制一致，但有必要了解引发物种的产率，以便确定这些体系中链反应的长度。此类产率已通过闪光光解测定。还测定了敏化剂光解和氢过氧化物产率对亚油酸酯浓度的依赖性，以阐明胶束形成或分子组织对过氧化过程的影响。此外，为了在饱和表面活性剂（脂质）体系中进行比较，使用这两种敏化剂，仅在十二烷基硫酸钠中通过光解技术研究了氢提取。
