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Sustainable Electron Shuttling Processes Mediated by In Situ‐Deposited Phenoxazine
ChemElectroChem ( IF 4 ) Pub Date : 2018-06-06 , DOI: 10.1002/celc.201800470
Yundang Wu 1 , Wei Liu 2 , Tongxu Liu 1 , Fangbai Li 1 , Tangfu Xiao 3 , Qihang Wu 3 , Yizhou He 4
Affiliation  

Phenoxazine and quinone are typical electron mediators in natural and engineered systems. Although the electron shuttling process of quinone has been well studied, phenoxazine is poorly characterized. Here, a model phenoxazine (resazurin) was examined as an electron mediator in a bioelectrochemical system with Shewanella oneidensis MR‐1. Results showed that the current generation was substantially enhanced by the presence of phenoxazine, and was almost unaffected even after replacing the original medium with a fresh medium without phenoxazine. This is completely different to the well‐known quinones used as electron mediators. Further study suggested that, resorufin (RR), as an intermediate product, was deposited in situ onto the electrode. The RR deposition was suggested to be a dominant mechanism for stabilizing the electron shuttling efficiency by phenoxazine. This study proposed a novel electron shuttling mechanism of phenoxazine and may provide a new insight into the extracellular electron transfer.

中文翻译:

原位沉积苯恶嗪介导的可持续电子关闭过程

苯恶嗪和醌是天然和工程系统中的典型电子介体。尽管已对醌的电子穿梭过程进行了充分的研究,但吩恶嗪的表征却很差。在这里,使用Shewanella oneidensis MR-1在生物电化学系统中检查了模型吩恶嗪(刃天青)作为电子介体的作用。结果表明,通过苯并恶嗪的存在大大增强了当前代,即使用不含苯并恶嗪的新鲜培养基替换原始培养基后,也几乎不受影响。这与用作电子介体的众所周知的醌完全不同。进一步的研究表明,作为中间体产品的间苯二酚(RR)是原位沉积到电极上。苯并恶嗪被认为是RR沉积是稳定电子穿梭效率的主要机制。这项研究提出了一种新的吩恶嗪电子穿梭机制,并可能为细胞外电子转移提供新的见解。
更新日期:2018-06-06
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