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Dominating Contribution of Intracellular Electron Generation over Extracellular Electron Transfer in Signaling Toxic Formaldehyde Exposure in Electrochemically Active Biofilm Sensors
Qi, Xiang1; Jiang, Yong2; Liu, Panpan3; Yin, Fengjun4; Liu, Xinning1; Gu, Yuyi1; Liang, Peng1
2023-08-10
摘要Electrochemicallyactive biofilm (EAB) has been widelyused asa sensitive element for water quality online early warning in thepast two decades. Researchers have learned that the electrical signaloutput of the EAB biosensor depends on intracellular electron generation(IEG) and extracellular electron transfer (EET) processes. But theirroles in responding to incoming toxicants are still unclear in waterquality early warning. This study employed a novel pulse open-circuitvoltammetry method to measure the changes of biofilm reaction resistancesand biofilm ohm resistances involved in a mixed-cultured EAB biosensorbefore and after toxicity. Results suggested that the toxic formaldehydemainly attacked the IEG process rather than the EET process. Thisfinding was also evidenced by the determination of dynamic generationcurrent and conduction current signals from an EAB biosensor usingan indium tin oxide gap electrode. These results help advance theunderstanding of the responding mechanism of an EAB sensor.
关键词electrochemically active biofilms biosensor sensitivity intracellular electron production extracellular electron transfer
DOI10.1021/acs.estlett.3c00485
发表期刊ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
ISSN2328-8930
页码5
通讯作者Liang, Peng(liangpeng@tsinghua.edu.cn)
收录类别SCI
WOS记录号WOS:001045160600001
语种英语