Activation of laccase bioelectrocatalysis of O2 reduction to H2O by carbon nanoparticles

Jensen, Uffe Bjørnholt; Vagin, Mikhail; Королева, О. В.; Sutherland, Duncan S.; Besenbacher, Flemming; Ferapontova, Elena E.

doi:10.1016/j.jelechem.2011.12.012

Cited by 35 publications

(29 citation statements)

References 53 publications

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“…Thus, we expected different surface compatibility between the overall negatively charged CDH, positively charged cyt c and differently charged CNPs, though the productive ET could be expected also for similarly charged surfaces and proteins as was previously demonstrated. [22] Along with that, in lower ionic strength solutions ( Figure S1) and in pure water [9] unmodified CNP possess significant negative charge, due to graphitic edge planes on the CNP surface with phenolic, quinoid and carboxylic surface functionalities. [21]…”

Section: Resultsmentioning

confidence: 74%

“…From this perspective, the most plausible explanation for the bioelectrocatalysis activation seems to be CDH-CNPs interactions introducing interfacial/conformational changes in the CDH's heme domain that enhance the CDH-ferricyanide reactivity (Figure 6a,b). The probability of the previously discussed allosteric regulation of bioelectrocatalysis by CNPs [9] is low. Considering different surface properties of CNPs used (their different charge), CNP and CNP-very likely interact with different surface domains of Humicola insolens CDH (overall, negatively charged) that are compatible with surface properties of the specific CNPs.…”

Section: Discussion Of the Mechanisms Of Cnps Actionmentioning

confidence: 92%

“…[8a] In ref. [9], bioelectrocatalysis of laccases from Cerrena maxima and Choriolus hirsutus was essentially improved by co-immobilization of laccases and CNPs on graphite electrodes, in particular, when CNPs were modified with the same as in ref. [8a] negatively-charged 4-sulphophenyl group.…”

Section: Introductionmentioning

confidence: 99%

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Activation of Cellobiose Dehydrogenase Bioelectrocatalysis by Carbon Nanoparticles

et al. 2019

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Protein‐nanoparticle (NP) interactions offer a powerful tool to modulate enzymatic activity and activate biocatalysis. However, strong scattering effects may complicate conventional spectrophotometric studies of NP‐assisted biocatalysis. Here, bioelectrocatalytic oxidation of cellobiose by the Humicola insolens cellobiose dehydrogenase (CDH) was electrochemically interrogated with two redox mediators, ferricyanide and cytochrome c, and two types of carbon NPs (CNPs), unmodified (CNP) and negatively charged 4‐sulfophenyl‐modified (CNP‐) ones. We show that both CNPs activate the bioelectrocatalytic oxidation of cellobiose and improve the enzymatic specificity reflected in the kf/KM relationship of 6680 (no CNPs), 15500 (CNP‐) and 10444 M−1 s−1 (CNP) shown for ferricyanide‐mediated and 1262 (no CNPs), 3630 (CNP‐), and 6375 M−1 s−1 (CNP) for cytochrome c‐mediated reactions. The bioelectrocatalysis activation by CNPs apparently results from the interfacial/conformational regulation of the CDH activity and the CDH‐electron acceptor reactivity, which may also be the case of other nanomaterials such as frequently used in bioelectrochemistry carbon nanotubes.

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Section: Resultsmentioning

confidence: 74%

Section: Discussion Of the Mechanisms Of Cnps Actionmentioning

confidence: 92%

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Activation of Cellobiose Dehydrogenase Bioelectrocatalysis by Carbon Nanoparticles

et al. 2019

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“…In the absence of immobilized ABTS mediator from A‐felt, the current density is only approximately 30 % lower, which indicates that the adsorbed enzyme is well oriented for direct electron transfer (DET) between the electrode, the copper centers of laccase, and the oxygen molecules. DET with laccase enzyme has already been reported 28–30. However, in this case, the open‐circuit voltage (OCV) is 0.34 V, as fixed by the polypyrrole electroconductivity, which also participates in electron transfer.…”

Section: Resultsmentioning

confidence: 93%

Synthesis, Persistent Luminescence, and Thermoluminescence Properties of Yellow Sr₃SiO₅:Eu²⁺,RE³⁺ (RE=Ce, Nd, Dy, Ho, Er, Tm, Yb) and Orange‐Red Sr_3−xBa_xSiO₅:Eu²⁺, Dy³⁺ Phosphor

Liu

et al. 2013

Chemistry An Asian Journal

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Sunlight-excitable orange or red persistent oxide phosphors with excellent performance are still in great need. Herein, an intense orange-red Sr3-xBaxSiO5:Eu(2+),Dy(3+) persistent luminescence phosphor was successfully developed by a two-step design strategy. The XRD patterns, photoluminescence excitation and emission spectra, and the thermoluminescence spectra were investigated in detail. By adding non-equivalent trivalent rare earth co-dopants to introduce foreign trapping centers, the persistent luminescence performance of Eu(2+) in Sr3SiO5 was significantly modified. The yellow persistent emission intensity of Eu(2+) was greatly enhanced by a factor of 4.5 in Sr3SiO5:Eu(2+),Nd(3+) compared with the previously reported Sr3SiO5:Eu(2+), Dy(3+). Furthermore, Sr ions were replaced with equivalent Ba to give Sr3-xBaxSiO5 :Eu(2+),Dy(3+) phosphor, which shows yellow-to-orange-red tunable persistent emissions from λ=570 to 591 nm as x is increased from 0 to 0.6. Additionally, the persistent emission intensity of Eu(2+) is significantly improved by a factor of 2.7 in Sr3-xBaxSiO5 :Eu(2+),Dy(3+) (x=0.2) compared with Sr3SiO5 :Eu(2+),Dy(3+). A possible mechanism for enhanced and tunable persistent luminescence behavior of Eu(2+) in Sr3-xBaxSiO5:Eu(2+),RE(3+) (RE=rare earth) is also proposed and discussed.

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“…DET with laccase enzyme has already been reported. [28][29][30] However, in this case, the open-circuit voltage (OCV) is 0.34 V, as fixed by the polypyrrole electroconductivity, which also participates in electron transfer. If laccase and ABTS are co-immobilized on A-felt electrodes, the bio-electroreduction of oxygen is enhanced; this results not only in higher cathodic currents, but also in a modulation of the OCV values at which oxygen reduction begins: approximately 0.34 V in the absence of ABTS and approximately 0.53 V for the laccase + ABTS couple.…”

Section: Preparation and Characterization Of Bioelectrodesmentioning

confidence: 97%

Control of Spatial Organization of Electrospun Fibers in a Carbon Felt for Enhanced Bioelectrode Performance

et al. 2014

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Activation of laccase bioelectrocatalysis of O2 reduction to H2O by carbon nanoparticles

Cited by 35 publications

References 53 publications

Activation of Cellobiose Dehydrogenase Bioelectrocatalysis by Carbon Nanoparticles

Activation of Cellobiose Dehydrogenase Bioelectrocatalysis by Carbon Nanoparticles

Synthesis, Persistent Luminescence, and Thermoluminescence Properties of Yellow Sr₃SiO₅:Eu²⁺,RE³⁺ (RE=Ce, Nd, Dy, Ho, Er, Tm, Yb) and Orange‐Red Sr_3−xBa_xSiO₅:Eu²⁺, Dy³⁺ Phosphor

Control of Spatial Organization of Electrospun Fibers in a Carbon Felt for Enhanced Bioelectrode Performance

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Activation of laccase bioelectrocatalysis of O2 reduction to H2O by carbon nanoparticles

Cited by 35 publications

References 53 publications

Activation of Cellobiose Dehydrogenase Bioelectrocatalysis by Carbon Nanoparticles

Activation of Cellobiose Dehydrogenase Bioelectrocatalysis by Carbon Nanoparticles

Synthesis, Persistent Luminescence, and Thermoluminescence Properties of Yellow Sr3SiO5:Eu2+,RE3+ (RE=Ce, Nd, Dy, Ho, Er, Tm, Yb) and Orange‐Red Sr3−xBaxSiO5:Eu2+, Dy3+ Phosphor

Control of Spatial Organization of Electrospun Fibers in a Carbon Felt for Enhanced Bioelectrode Performance

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Product

Resources

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Synthesis, Persistent Luminescence, and Thermoluminescence Properties of Yellow Sr₃SiO₅:Eu²⁺,RE³⁺ (RE=Ce, Nd, Dy, Ho, Er, Tm, Yb) and Orange‐Red Sr_3−xBa_xSiO₅:Eu²⁺, Dy³⁺ Phosphor