Monocopper complex based on N-tripodal ligand immobilized in a Nafion® film for biomimetic detection of catechols: Application to dopamine

Boulkroune, M.; Lemaire, Alizée; Chibani, Aïssa; Geneste, Florence

doi:10.1016/j.electacta.2016.10.040

Cited by 14 publications

(9 citation statements)

References 30 publications

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“…On the other hand, Zen et al and Boulkroune et al presented dopamine sensors that do not require the addition of hydrogen peroxide to a buffer [ 53 , 54 ]. In both cases, oxidation of dopamine is performed by forming an intermediate copper (II)-o-quinolate complex (Fig.…”

Section: Copper and Copper Oxidementioning

confidence: 99%

Electrochemical sensors based on metal nanoparticles with biocatalytic activity

et al. 2022

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Biosensors have attracted a great deal of attention, as they allow for the translation of the standard laboratory-based methods into small, portable devices. The field of biosensors has been growing, introducing innovations into their design to improve their sensing characteristics and reduce sample volume and user intervention. Enzymes are commonly used for determination purposes providing a high selectivity and sensitivity; however, their poor shelf-life is a limiting factor. Researchers have been studying the possibility of substituting enzymes with other materials with an enzyme-like activity and improved long-term stability and suitability for point-of-care biosensors. Extra attention is paid to metal and metal oxide nanoparticles, which are essential components of numerous enzyme-less catalytic sensors. The bottleneck of utilising metal-containing nanoparticles in sensing devices is achieving high selectivity and sensitivity. This review demonstrates similarities and differences between numerous metal nanoparticle-based sensors described in the literature to pinpoint the crucial factors determining their catalytic performance. Unlike other reviews, sensors are categorised by the type of metal to study their catalytic activity dependency on the environmental conditions. The results are based on studies on nanoparticle properties to narrow the gap between fundamental and applied research. The analysis shows that the catalytic activity of nanozymes is strongly dependent on their intrinsic properties (e.g. composition, size, shape) and external conditions (e.g. pH, type of electrolyte, and its chemical composition). Understanding the mechanisms behind the metal catalytic activity and how it can be improved helps designing a nanozyme-based sensor with the performance matching those of an enzyme-based device. Graphical abstract

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Section: Copper and Copper Oxidementioning

confidence: 99%

Electrochemical sensors based on metal nanoparticles with biocatalytic activity

et al. 2022

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“…The dependence of the electrochemical signal on the concentration of 4-nitrophenylacetic acid was examined by cyclic voltammetry on four different (C 5 H 5 ) 2 Ti IV (OH 2 ) 2 2+ -modified electrodes and is given in Figure 3. 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 59 60 A c c e p t e d M a n u s c r i p t The limit of detection (3  the standard deviation of five blank determinations) was determined from: 19 St-Sb ≥ 3σ (5) 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 ...…”

Section: Electrolytementioning

confidence: 99%

“…The term "enzyme-less biosensor" has been previously attributed to this kind of sensor. 19 We have previously reported the interest of titanocene dichloride ((C 5 H 5 ) 2 TiCl 2 ) for the electrochemical reduction of biorecalcitrant pesticides containing a nitro group. 20 We have also shown that it keeps its catalytic activity when immobilized on graphite felt electrodes by encapsulation in a Nafion film.…”

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confidence: 99%

“…This perfluorinated ion-exchange polymer is well-known for its good proton conductivity, its mechanical stability, and its ability to preconcentrate species on the electrode surface. 19 The preparation of the sensor was optimized in terms of sensitivity and stability. Its ability to detect different nitro derivatives was then evaluated.…”

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confidence: 99%

“…They offer the advantage of more efficient electronic transfer compared with those of enzyme-based systems, which often require mediators; moreover, they are less expensive and more stable against time and pH and temperature variations. The term “enzymeless biosensor” has been previously attributed to this kind of sensor …”

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confidence: 99%

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Ti-Catalyst Biomimetic Sensor for the Detection of Nitroaromatic Pollutants

2019

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An electrode modified by a Ti complex in Nafion ® was used in the electrochemical detection of nitroaromatic compounds (NACs). The catalyst reduces nitroaromatic groups by a 6-electron process and with a high apparent rate constant k 1 that was estimated to be at least 19000 mol -1 L s -1 by simulation of the first step of the cathodic reduction of 4-nitrophenylacetic acid used as model molecule. The modified electrode was prepared and optimized in terms of Nafion ® and catalyst concentrations. In the chosen analytical medium, the Ti catalyst-containing electrode shows a good stability in the presence of nitro species. A standard deviation around 15% was calculated on the analysis performed with 28 different modified electrodes, which could be expected for a drop-coating process. We show that the modified electrode detects several nitroaromatic compounds such as nitrophenols, mononitroaniline and dinitrotoluene with detection limits ranging from 1 to 9 × 10 -4 g L -1 (0.2-5.1 × 10 -6 mol L -1 ). As an interesting feature, the sensor exhibits a good selectivity towards NACs detection since titanocene did not catalyze the reduction of nitroaliphatic compounds.

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