In situ synthesis of permselective zeolitic imidazolate framework-8/graphene oxide composites: rotating disk electrode and Langmuir adsorption isotherm

Luanwuthi, Santamon; Krittayavathananon, Atiweena; Srimuk, Pattarachai

doi:10.1039/c5ra05950j

Cited by 73 publications

(38 citation statements)

References 45 publications

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“…where K’ M is the “surface” Michaelis‐Menten constant, which can here become the inverse of the Langmuir adsorption coefficient, K ads ,

θ_{E S}^{e q}

is the surface coverage of intermediate form of enzyme‐substrate (ES) and [ S ] is the bulk concentration of the hsDNA substrate ,. This equation can be calculated by replacing

θ_{E S}^{e q}

with I/I max , as shown below :

true \frac{[S]}{I} = \frac{1}{K_{a d s} {\times I}_{m a x}} + \frac{[S]}{I_{m a x}}

…”

Section: Resultsmentioning

confidence: 99%

“…The surface enzyme kinetics can be evaluated by the following equation: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 which can here become the inverse of the Langmuir adsorption coefficient, K ads , q eq ES is the surface coverage of intermediate form of enzyme-substrate (ES) and [S] is the bulk concentration of the hsDNA substrate [27,28]. This equation can be calculated by replacing q eq ES with I/I max , as shown below [29]:…”

Section: Characterization Of a Graphene Monolayer Electrode By Means mentioning

confidence: 99%

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Homogeneous Electrochemical Assay for Real‐time Monitoring of Exonuclease III Activity Based on a Graphene Monolayer

et al. 2017

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A homogeneous electrochemical assay based on a graphene monolayer electrode was developed for simple, sensitive, rapid and quantitative analysis of the exonuclease III (Exo III) activity. The method utilized a methylene blue (MB) tagged DNA substrate with hairpin structure, and a graphene monolayer attached on the working electrode. Before digestion, the hairpin structure prevents the adsorption of the DNA substrate to the graphene surface. Degradation of the substrate by the 3′–5′ Exo III, however, yields single‐stranded DNA (ssDNA), resulting in its subsequent binding to the graphene surface through π‐π stacking, which produces the voltammetric current from electrochemical reduction of the MB tag anchoring at the end of ssDNA. A direct quantification of the Exo III activity can be achieved by measuring the reductive peak current of the MB tag under easily attainable potential (∼ −0.1 V vs Ag/AgCl) range comparably sensitive to the conventional methods such as a gel‐based or fluorescence‐based assays. Our approach can be applied to measure various exonucleases activity by adjusting the structure of DNA substrate suggesting a new assay method in drug screening and basic research related to the enzymes.

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“…where K’ M is the “surface” Michaelis‐Menten constant, which can here become the inverse of the Langmuir adsorption coefficient, K ads ,

θ_{E S}^{e q}

is the surface coverage of intermediate form of enzyme‐substrate (ES) and [ S ] is the bulk concentration of the hsDNA substrate ,. This equation can be calculated by replacing

θ_{E S}^{e q}

with I/I max , as shown below :

true \frac{[S]}{I} = \frac{1}{K_{a d s} {\times I}_{m a x}} + \frac{[S]}{I_{m a x}}

…”

Section: Resultsmentioning

confidence: 99%

Section: Characterization Of a Graphene Monolayer Electrode By Means mentioning

confidence: 99%

Homogeneous Electrochemical Assay for Real‐time Monitoring of Exonuclease III Activity Based on a Graphene Monolayer

et al. 2017

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“…The G band contributes to the vibration of graphitic (sp 2 carbon) lattice while the D band is related to the defects and disordered regions of the lattice caused by the oxidation reaction. Raman shifts of ZIF-8 at 686, 1144, 1183, 1459, and 1405 cm −1 are assigned to the vibrational modes of the Hmim ligand [34][35][36]. It is clear that the Raman shifts of both IL-RGO and ZIF-8 are presented in IL-RGO/ZIF-8 nanocomposites; furthermore, the intensity of feature peak 1586 cm −1 associated with the G band of RGO becomes stronger with the increase of IL-RGO in The FTIR spectra of the nanocomposites are shown in Figure 2(c).…”

Section: Resultsmentioning

confidence: 99%

Highly Sensitive Detection of Dopamine at Ionic Liquid Functionalized RGO/ZIF-8 Nanocomposite-Modified Electrode

Cheng

Fan

Shen

et al. 2019

Journal of Nanomaterials

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A hybrid and hierarchical nanocomposite was successfully prepared by the growth of zeolitic imidazolate framework-8 (ZIF-8) on the template of ionic liquid (IL, [Bmim][BF4]) functionalized reduced graphene oxide (IL-RGO). The structure and morphology of the IL-RGO/ZIF-8 nanocomposite were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FTIR), and Raman spectroscopy. The results showed that RGO sheets were refrained from restacking by IL, and ZIF-8 nanoparticles grew well on the surface of IL-RGO. Owing to the synergistic effect from large surface area and excellent electrocatalytic activity of ZIF-8 and great electrical conductivity of IL-RGO, a highly sensitive sensor for dopamine (DA) can be obtained. IL-RGO/ZIF-8-modified electrode exhibits good electrocatalytic activity and electroconductive properties towards DA which were investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). Compared with bare or IL-RGO-modified electrodes, the IL-RGO/ZIF-8-modified electrode effectively depressed the oxidation overpotential of DA. The linear response range of DA was from 1.0×10−7 to 1.0×10−4 mol/L with a low detection of limit 3.5×10−8 mol/L. In addition, the sensor was shown to provide satisfactory stability for the determination of DA.

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“…GO was firstly synthesized using a modified Hummers method previously reported by our group142659606162. The N-rGO ae was then synthesized via a hydrothermal reduction of GO with 0.5 M hydrazine (N 2 H 4 ) a reducing agent.…”

Section: Methodsmentioning

confidence: 99%

Charge storage mechanisms of manganese oxide nanosheets and N-doped reduced graphene oxide aerogel for high-performance asymmetric supercapacitors

Iamprasertkun

Krittayavathananon

Seubsai

et al. 2016

Sci Rep

Self Cite

100

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Although manganese oxide- and graphene-based supercapacitors have been widely studied, their charge storage mechanisms are not yet fully investigated. In this work, we have studied the charge storage mechanisms of K-birnassite MnO2 nanosheets and N-doped reduced graphene oxide aerogel (N-rGOae) using an in situ X-ray absorption spectroscopy (XAS) and an electrochemical quart crystal microbalance (EQCM). The oxidation number of Mn at the MnO2 electrode is +3.01 at 0 V vs. SCE for the charging process and gets oxidized to +3.12 at +0.8 V vs. SCE and then reduced back to +3.01 at 0 V vs. SCE for the discharging process. The mass change of solvated ions, inserted to the layers of MnO2 during the charging process is 7.4 μg cm−2. Whilst, the mass change of the solvated ions at the N-rGOae electrode is 8.4 μg cm−2. An asymmetric supercapacitor of MnO2//N-rGOae (CR2016) provides a maximum specific capacitance of ca. 467 F g−1 at 1 A g−1, a maximum specific power of 39 kW kg−1 and a specific energy of 40 Wh kg−1 with a wide working potential of 1.6 V and 93.2% capacity retention after 7,500 cycles. The MnO2//N-rGOae supercapacitor may be practically used in high power and energy applications.

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In situ synthesis of permselective zeolitic imidazolate framework-8/graphene oxide composites: rotating disk electrode and Langmuir adsorption isotherm

Cited by 73 publications

References 45 publications

Homogeneous Electrochemical Assay for Real‐time Monitoring of Exonuclease III Activity Based on a Graphene Monolayer

Homogeneous Electrochemical Assay for Real‐time Monitoring of Exonuclease III Activity Based on a Graphene Monolayer

Highly Sensitive Detection of Dopamine at Ionic Liquid Functionalized RGO/ZIF-8 Nanocomposite-Modified Electrode

Charge storage mechanisms of manganese oxide nanosheets and N-doped reduced graphene oxide aerogel for high-performance asymmetric supercapacitors

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