Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, 422 Siming South Road, Xiamen 361005, Fujian, China; CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen 361021, Fujian, China.
CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen 361021, Fujian, China.
Bioelectrochemistry. 2023 Aug;152:108439. doi: 10.1016/j.bioelechem.2023.108439. Epub 2023 Apr 7.
Riboflavin has been proposed to serve as an electron shuttle in photoelectrochemical systems. However, riboflavin was also observed for abiotic photolysis under illumination. Such conflicting reports raise the necessity for further investigation. In this study, riboflavin secreted by Rhodopseudomonas palustris was studied to clarify its stability and electron shuttle function under illumination. The data of high-performance liquid chromatography-mass spectrometry showed that the riboflavin was photolyzed to lumichrome in microbial photoelectrochemical systems. In addition, the anodic current increased by 75% after adding lumichrome compared with that of the control; it further demonstrated that lumichrome, not riboflavin, as an electron shuttle could facilitate microbial electron transfer. This study clarifies the mechanism of the interface process in microbial photoelectrochemical systems.
核黄素被提议作为光电化学系统中的电子穿梭体。然而，核黄素在光照下也被观察到发生非生物光解。这些相互矛盾的报告使得有必要进一步研究。在这项研究中，研究了沼泽红假单胞菌分泌的核黄素，以阐明其在光照下的稳定性和电子穿梭功能。高效液相色谱-质谱数据表明，核黄素在微生物光电化学系统中被光解为光色烯。此外，与对照相比，添加光色烯后阳极电流增加了 75%；这进一步证明了光色烯而不是核黄素作为电子穿梭体可以促进微生物电子转移。本研究阐明了微生物光电化学系统界面过程的机制。
