Derivatization of single-walled carbon nanotubes with redox mediator for biocatalytic oxygen electrodes

Sadowska, Kamila; Stolarczyk, Krzysztof; Biernat, Jan F.; Roberts, Kenneth P.; Rogalski, Jerzy; Bilewicz, Renata

doi:10.1016/j.bioelechem.2010.06.003

Cited by 35 publications

(19 citation statements)

References 40 publications

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“…The surface concentration calculated based on the cyclic voltammogram for the electrode modified with mixed DPPTE–SWCNTs-DNR monolayer is equal to 0.67 × 10 −10 mol/cm 2 , while the value obtained for DPPTE supported monolayer exposed to DNR solution is equal to 0.60 × 10 −10 mol/cm 2 as reported before [24]. Moreover, the values obtained for the mixed layer containing modified carbon nanotubes are comparable to the values reported for carbon nanotubes derivatized with antraquinone [35] and other types of electroactive species [36–37]. …”

Section: Resultssupporting

confidence: 84%

Comparison of the interactions of daunorubicin in a free form and attached to single-walled carbon nanotubes with model lipid membranes

Matyszewska¹

2016

Beilstein J. Nanotechnol.

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SummaryIn this work the interactions of an anticancer drug daunorubicin (DNR) with model thiolipid layers composed of 1,2-dipalmitoyl-sn-glycero-3-phosphothioethanol (DPPTE) were investigated using Langmuir technique. The results obtained for a free drug were compared with the results recorded for DNR attached to SWCNTs as potential drug carrier. Langmuir studies of mixed DPPTE–SWCNTs-DNR monolayers showed that even at the highest investigated content of the nanotubes in the monolayer, the changes in the properties of DPPTE model membranes were not as significant as in case of the incorporation of a free drug, which resulted in a significant increase in the area per molecule and fluidization of the thiolipid layer. The presence of SWCNTs-DNR in the DPPTE monolayer at the air–water interface did not change the organization of the lipid molecules to such extent as the free drug, which may be explained by different types of interactions playing crucial role in these two types of systems. In the case of the interactions of free DNR the electrostatic attraction between positively charged drug and negatively charged DPPTE monolayer play the most important role, while in the case of SWCNTs-DNR adducts the hydrophobic interactions between nanotubes and acyl chains of the lipid seem to be prevailing. Electrochemical studies performed for supported model membranes containing the drug delivered in the two investigated forms revealed that the surface concentration of the drug-nanotube adduct in supported monolayers is comparable to the reported surface concentration of the free DNR incorporated into DPPTE monolayers on gold electrodes. Therefore, it may be concluded that the application of carbon nanotubes as potential DNR carrier allows for the incorporation of comparable amount of the drug into model membranes with simultaneous decrease in the negative changes in the membrane structure and organization, which is an important aspect in terms of side effects of the drug.

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Section: Resultssupporting

confidence: 84%

Comparison of the interactions of daunorubicin in a free form and attached to single-walled carbon nanotubes with model lipid membranes

Matyszewska¹

2016

Beilstein J. Nanotechnol.

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“…Modified with ABTS. The researchers have recently developed a procedure for the modification of the carbon nanotubes with residues of ABTS [28,29]. By employing the same procedure, amino-functionalized SNPs were conjugated with ABTS.…”

Section: Preparation and Characteristics Of Silica Nanoparticlesmentioning

confidence: 99%

ABTS-Modified Silica Nanoparticles as Laccase Mediators for Decolorization of Indigo Carmine Dye

Liu

Yan

Geng

et al. 2015

Journal of Chemistry

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Efficient reuse and regeneration of spent mediators are highly desired for many of the laccases’ biotechnology applications. This investigation demonstrates that a redox mediator 2,2′-azino-bis-(3-ethylbenzothiazoline)-6-sulfonic acid (ABTS) covalently attached to silica nanoparticles (SNPs) effectively mediated dye decolorization catalyzed by laccase. Characteristics of ABTS-modified silica nanoparticles (ABTS-SNPs) were researched by scanning electron microscopy and Fourier-transformed infrared spectroscopy. When ABTS and ABTS-SNPs were used as laccase mediators, the decolorization yields of 96 and 95% were, respectively, obtained for indigo carmine dye. The results suggest that ABTS immobilized on SNPs can be used as laccase mediators as they retain almost the same efficiency as the free ABTS. The oxidized ABTS-SNPs were regenerated by their reduction reaction with ascorbic acid. Decolorization efficiency of regenerated ABTS-SNPs and their initial forms were found to be almost equivalent. Six reuse cycles for spent ABTS-SNPs were run for the treatment of indigo carmine, providing decolorization yields of 96–77%. Compared with free mediator, the immobilized mediators have the advantage of being easily recovered, regenerated, and reused making the whole process environmentally friendly.

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“…For each cyclic voltammogram, the ratios of charges under the respective reduction and oxidation peaks were close to unity. Moreover, the potentials of the reductive and oxidative peak and the formal potential had no obviously change when the scan rates increased, suggesting a reversible electrode kinetics [37]. In the voltammograms, it also can be seen that the anodic and cathodic peak currents (I pa and I pc ) for laccase were linearly proportional to the square root of the scan rate ranging from 10 to 900 mV/s with a correlation coefficient of 0.993.…”

Section: Resultsmentioning

confidence: 92%

Immobilization of laccase in N-doped carbon hollow spheres/chitosan composite film for electrochemical detection of kraft lignin

Liu

Cao

Qian

et al. 2012

Journal of Electroanalytical Chemistry

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Derivatization of single-walled carbon nanotubes with redox mediator for biocatalytic oxygen electrodes

Cited by 35 publications

References 40 publications

Comparison of the interactions of daunorubicin in a free form and attached to single-walled carbon nanotubes with model lipid membranes

Comparison of the interactions of daunorubicin in a free form and attached to single-walled carbon nanotubes with model lipid membranes

ABTS-Modified Silica Nanoparticles as Laccase Mediators for Decolorization of Indigo Carmine Dye

Immobilization of laccase in N-doped carbon hollow spheres/chitosan composite film for electrochemical detection of kraft lignin

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