Laccase Bioelectrocatalyst at a Steroid-Type Biosurfactant-Modified Carbon Nanotube Interface

Tominaga, Masato; Sasaki, Aiko; Togami, Makoto

doi:10.1021/acs.analchem.5b00858

Cited by 39 publications

(32 citation statements)

References 45 publications

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“…The value of k c was unknown, and was assumed to be 2600 s ¹1 . 16 k f and k b are the surface electron transfer rate constants expressed by the ButlerVolmer-type equation. E°B is the formal redox potential of the T1 Cu site.…”

Section: Resultsmentioning

confidence: 99%

“…22 SWCNTs were synthesized on the surface of a 0.8-mm-diameter gold wire, by chemical vapor deposition as described previously. 16,23,24 Field-emission scanning electron microscopy indicated SWCNT bundles of ³20 nm in diameter. The thickness of the SWCNT layer was ca.…”

Section: Methodsmentioning

confidence: 99%

“…16 Lac electrodes in biosensors can be inhibited by Cl ¹ , which affects their performance under physiological conditions. [4][5][6]12,13,[17][18][19][20] Intracellular fluid contains little Cl ¹ (³3 © 10 ¹3 mol dm…”

Section: ¹1mentioning

confidence: 99%

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Bioelectrocatalytic Oxygen Reaction and Chloride Inhibition Resistance of Laccase Immobilized on Single-walled Carbon Nanotube and Carbon Paper Electrodes

2016

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The rate of heterogeneous direct electron transfer of laccase immobilized on single-walled carbon nanotube (SWCNT) and carbon paper electrodes was evaluated by cyclic voltammetry and background-current-corrected steady-state linear voltammetry. These rates indicated that the molecular orientation of laccase immobilized on the SWCNT electrode was more favorable for direct electron transfer, than that of laccase immobilized on the carbon paper electrode. The inhibition of the bioelectrocatalytic O 2 reduction current of the two electrodes by chloride and fluoride were tested. The results indicated differing inhibition mechanisms by these two halides. Laccase immobilized on the SWCNT electrode exhibited high stability and high resistance to chloride inhibition.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Bioelectrocatalytic Oxygen Reaction and Chloride Inhibition Resistance of Laccase Immobilized on Single-walled Carbon Nanotube and Carbon Paper Electrodes

2016

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“…SC molecules act as an insulating barrier and inhibit fast electron transfer when the SC molecules form a multilayer on the HOPG interface. The electron transfer rate constant (k˚') for Lac at the SC-modified HOPG was evaluated by previously reported methods [25][26][27]. Figure 7a shows the catalytic current steady-state voltammograms and their fittings with simulated plots (Supplementary Material).…”

Section: = (−2 )mentioning

confidence: 99%

Cholate Adsorption Behavior at Carbon Electrode Interface and Its Promotional Effect in Laccase Direct Bioelectrocatalysis

Tominaga¹,

Tsutsui²,

Takatori³

2018

Colloids and Interfaces

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Fast electron transfer between laccase (Lac) and single-walled carbon nanotubes (SWCNTs) can be achieved at a cholate-modified SWCNT interface. Furthermore, the catalytic reduction of O 2 starts at a high potential, close to the equilibrium redox potential of the O 2 /H 2 O couple. A sodium cholate (SC)-modified electrode interface provides suitable conditions for Lac direct bioelectrocatalysis. In the present study, the SC promotional effect in Lac direct bioelectrocatalysis was investigated using various types of electrode materials. The fully hydrophilic surface of indium tin oxide and an Au electrode surface did not show a SC promotional effect, because SC did not bind to these surfaces. A carbon surface with a large number of defects was unsuitable for SC binding because of hydrophilic functional groups at the defect sites. Carbon surfaces with few defects, for example, basal-plane highly oriented pyrolytic graphite (HOPG), gave a SC promotional effect.

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“…This estimated value corresponds to the value in the previous report. 16 All characterization were based on the report written by Williams and Eklund. …”

mentioning

confidence: 99%

Single-Walled Carbon Nanotubes-Modified Gold Electrode for Dopamine Detection

Kurniawan

Kiswiyah

Madurani

et al. 2017

ECS J. Solid State Sci. Technol.

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Modification of gold electrode using single-walled carbon nanotubes (SWCNTs) has been done. The synthesis of SWCNTs on the gold electrode surfaces was carried out using chemical vapor deposition (CVD) method. The performance of the electrodes as a sensor was characterized using dopamine (DA) solution at pH 4 by cyclic voltammetry. A change in electrode capacitance was found before and after DA detection. The detection limit and sensitivity of the electrodes are 0.79 μM and 3.414 μA mm −2 μM −1 , respectively. No interference signal was found from ascorbic acid (AA) during DA measurement. DA is a chemical compound that belongs to catecholamine group and have important roles in the central nervous.1 It is found in human body and commonly located at the hypothalamus.2 Low level of DA on the human body can cause some disorders, e.g. Alzheimer, schizophrenia, and Parkinson.3-5 Therefore, DA detection is important to find out the amount of DA inside the human body.Electrochemistry is an analytical method that had been applied as a biosensor.6 This method is commonly used because it is relatively fast, simple and low-cost. 7 Biosensors selectivity and sensitivity improvements can be conducted by modifying the electrodes using a specific material.8 Most of the modified electrodes are platinum, silver and gold. 8 The modified electrodes have been reported as a dopamine (DA) biosensor, i.e. gold nanoparticles electrode, 1 calixarene modified GCE, 5 nanoporous Au-Ag alloy electrodes, 3 and carbon nanomaterial electrodes. 4 Several scientists already used carbon nanotubes (CNTs) with various materials combinations to detect DA. [9][10][11][12] In this research, we used single-walled carbon nanotubes (SWCNTs) modified gold electrode as working electrodes for DA detection. SWCNTs is one of the most preferred materials that is used as a biosensor because of its dimensional character. 13 This material was made in our laboratory by a CVD method which is relatively different with available catalyst in the Market.14 The type of the catalyst used in the SWCNTs synthesis influenced the activity performance of the catalyst itself. 15 In our previous research, we modified gold electrodes using gold nanoparticles that have detection limit of 2 μM.1 The performance of the SWCNTs modified gold electrode in this research will be compared with the previous work. ExperimentalSynthesis of single-walled carbon nanotubes (SWCNTs).-Gold electrodes were modified with SWCNTs by CVD method as from our previous work.14, 16 The results obtained from Field-emission scanning microscopy (FE-SEM) and Transmission electron microscopy (TEM) indicated that SWCNTs were bundled with each other, resulting in tubes with diameters of 5-20 nm. The SWCNTs intensity ratio obtained from Raman Spectroscopy at G-band and D-band at ca.1590 cm −1 and 1350 cm −1 respectively, was ca. 20 when a wavelength of 514,5 nm was used. The D-band was very weak, which indicated that * Electrochemical Society Member.z E-mail: fredy@chem.its.ac.id the SWCNTs contained high level cry...

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Laccase Bioelectrocatalyst at a Steroid-Type Biosurfactant-Modified Carbon Nanotube Interface

Cited by 39 publications

References 45 publications

Bioelectrocatalytic Oxygen Reaction and Chloride Inhibition Resistance of Laccase Immobilized on Single-walled Carbon Nanotube and Carbon Paper Electrodes

Bioelectrocatalytic Oxygen Reaction and Chloride Inhibition Resistance of Laccase Immobilized on Single-walled Carbon Nanotube and Carbon Paper Electrodes

Cholate Adsorption Behavior at Carbon Electrode Interface and Its Promotional Effect in Laccase Direct Bioelectrocatalysis

Single-Walled Carbon Nanotubes-Modified Gold Electrode for Dopamine Detection

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