Tuning the Potential of Electron Extraction from Microbes with Ferrocene-Containing Conjugated Oligoelectrolytes.

Autor: McCuskey SR; Department of Chemical Engineering, University of California, Santa Barbara, CA, 93106, USA.; Center for Polymers and Organic Solids, University of California, Santa Barbara, CA, 93106, USA., Rengert ZD; Center for Polymers and Organic Solids, University of California, Santa Barbara, CA, 93106, USA.; Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA., Zhang M; Department of Chemical Engineering, University of California, Santa Barbara, CA, 93106, USA., Helgeson ME; Department of Chemical Engineering, University of California, Santa Barbara, CA, 93106, USA., Nguyen TQ; Center for Polymers and Organic Solids, University of California, Santa Barbara, CA, 93106, USA.; Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA., Bazan GC; Center for Polymers and Organic Solids, University of California, Santa Barbara, CA, 93106, USA.; Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA.; Materials Department, University of California, Santa Barbara, CA, 93106, USA.
Jazyk: angličtina
Zdroj: Advanced biosystems [Adv Biosyst] 2019 Feb; Vol. 3 (2), pp. e1800303. Date of Electronic Publication: 2018 Dec 10.
DOI: 10.1002/adbi.201800303
Abstrakt: Synthetic systems that facilitate electron transport across cellular membranes are of interest in bio-electrochemical technologies such as bio-electrosynthesis, waste water remediation, and microbial fuel cells. The design of second generation redox-active conjugated oligoelectrolytes (COEs) bearing terminal cationic groups and a π-delocalized core capped by two ferrocene units is reported. The two COEs, DVFBO and F 4 -DVFBO, have similar membrane affinity, but fluorination of the core results in a higher oxidation potential (422 ± 5 mV compared to 365 ± 4 mV vs Ag/AgCl for the neutral precursors in chloroform). Concentration-dependent aggregation is suggested by zeta potential measurements and confirmed by cryogenic transmission electron microscopy. When the working electrode potential (E CA ) is poised below the oxidation potential of the COEs (E CA = 200 mV) in three-electrode electrochemical cells containing Shewanella oneidensis MR-1, addition of DVFBO and F 4 -DVFBO produces negligible biocurrent enhancement over controls. At E CA = 365 mV, DVFBO increases steady-state biocurrent by 67 ± 12% relative to controls, while the increase with F 4 -DVFBO is 30 ± 5%. Cyclic voltammetry supports that DVFBO increases catalytic biocurrent and that F 4 -DVFBO has less impact, consistent with their oxidation potentials. Overall, electron transfer from microbial species is modulated via tailoring of the COE redox properties.
(© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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