Photochemical reactions of dibromothymoquinone.
Photochemical reactions of dibromothymoquinone.
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二溴百里醌醌的光化学反应。
DOI：
10.1111/j.1751-1097.1982.tb04357.x
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发表时间：
1982
影响因子：
3.3
通讯作者：
Siedow,JN
中科院分区：
文献类型：
--
作者：
Caspar,T;Siedow,JN
光合电子传递抑制剂二溴百里醌被发现介导的马心细胞色素c在水溶液中的光还原。这个过程似乎涉及到二溴百里醌还原为相应的氢醌，然后直接电子转移到细胞色素c。随后发生还原的细胞色素c的“自氧化”，这需要氧气和醌的存在。辐照二溴百里醌的乙醇储备溶液产生一种氢醌物质，该物质（1）能够在黑暗中直接还原水溶液中的细胞色素c，（2）在化学上与母体化合物不同。这种光诱导物质在乙醇溶液中稳定，但在水介质中会发生自氧化（t1/2= 24 s）。由于二溴百里醌用于光合作用的研究，必须采取一些措施，以避免并发症，可能会出现上述反应，适当的预防措施进行了讨论。
The photosynthetic electron transport inhibitor dibromothymoquinone was found to mediate the photoreduction of horse heart cytochrome c in aqueous solution. This process appears to involve the reduction of dibromothymoquinone to the corresponding hydroquinone followed by direct electron transfer to cytochromec.A subsequent‘autoxidation’of the reduced cytochrome c takes place which requires the presence of both oxygen and quinone. Irradiation of ethanolic stock solutions of dibromothymoquinone generates a hydroquinone species which is (1) capable of reducing cytochrome c directly in aqueous solution in the dark and (2) chemically distinct from the parent compound. This photore‐duced species is stabilized in ethanolic solution but undergoes autoxidation (t1/2= 24 s) when placed in an aqueous medium. Because dibromothymoquinone is used in photosynthetic studies, some care must be taken to avoid complications which might arise from the above reactions; suitable precautions are discussed.