Reduced Graphene Oxide/Gold Nanoparticles Modified Screen‐Printed Electrode for the Determination of Palmitic Acid

Ching, Chin Boon; Abdullah, Jaafar; Yusof, Nor Azah

doi:10.1155/2021/6684770

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…The DPV peak current values for AuNPs/Gr, AuNPs, and Gr electrode surfaces were 31.55, 26.36, and 26.21 mA, respectively. This finding proves that the AuNPs/Gr nanocomposite is suitable for electrochemical analysis and enhances the electrocatalytic activity by facilitating electron transfer in the redox process [54].…”

Section: Electrochemical Characterisation Of Screen-printed Carbon El...supporting

confidence: 56%

Rapid and sensitive detection of box turtles using an electrochemical DNA biosensor based on a gold/graphene nanocomposite

Hashem¹,

Hossain²,

Marlinda³

et al. 2022

Beilstein J. Nanotechnol.

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The Southeast Asian box turtle, Cuora amboinensis, is an ecologically important endangered species which needs an onsite monitoring device to protect it from extinction. An electrochemical DNA biosensor was developed to detect the C. amboinensis mitochondrial cytochrome b gene based on an in silico designed probe using bioinformatics tools, and it was also validated in wet-lab experiments. As a detection platform, a screen-printed carbon electrode (SPCE) enhanced with a nanocomposite containing gold nanoparticles and graphene was used. The morphology of the nanoparticles was analysed by field-emission scanning electron microscopy and structural characteristics were analysed by using energy-dispersive X-ray, UV–vis, and Fourier-transform infrared spectroscopy. The electrochemical characteristics of the modified electrodes were studied by cyclic voltammetry, differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy. The thiol-modified synthetic DNA probe was immobilised on modified SPCEs to facilitate hybridisation with the reverse complementary DNA. The turtle DNA was distinguished based on hybridisation-induced electrochemical change in the presence of methylene blue compared to their mismatches, noncomplementary, and nontarget species DNA measured by DPV. The developed biosensor exhibited a selective response towards reverse complementary DNAs and was able to discriminate turtles from other species. The modified electrode displayed good linearity for reverse complementary DNAs in the range of 1 × 10−11–5 × 10−6 M with a limit of detection of 0.85 × 10−12 M. This indicates that the proposed biosensor has the potential to be applied for the detection of real turtle species.

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Section: Electrochemical Characterisation Of Screen-printed Carbon El...supporting

confidence: 56%

Rapid and sensitive detection of box turtles using an electrochemical DNA biosensor based on a gold/graphene nanocomposite

Hashem¹,

Hossain²,

Marlinda³

et al. 2022

Beilstein J. Nanotechnol.

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“…3a), demonstrating the successful reduction of Go into rGo. 30 Figure 3c shows AuNPs distributed on the rGo film, it can be observed that the surface particles are attached, with a large number of evenly dispersed AuNPs densely distributed on the surface of rGo, with little aggregation. Further characterization of the electrochemical properties of different electrodes was carried CV.…”

Section: Resultsmentioning

confidence: 96%

Wearable Electrochemical Biosensors for In Situ Pesticide Analysis from Crops

Chen,

Zhou,

et al. 2023

J. Electrochem. Soc.

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On-site monitoring of pesticide presence on the surface of crops is a growing trend in precision and intelligent agriculture. In this study, we prepared a wearable biosensor for in-situ detection of pesticides on surfaces of crops. Here, a flexible fiber membrane substrate was prepared via the electrospinning technology. After the three-electrode system was transferred onto the membrane substrate use screen printing, resulting in a screen printing electrode (SPE) that can effectively adapt to the irregular surface of crops or fruits. By modified the SPE with acetylcholinesterase (AchE), the biosensor showed excellent selectively and recognize for the methyl parathion. To further enhance the electrochemical performance, the surface of the work electrode was modified with gold nanoparticles (AuNPs) and reduced graphene oxide (rGo). The developed wearable sensor successfully detected methyl parathion, showing a good linear relationship within the range of 1 to 2 ppm. The detection limit was measured to be 0.48 ppb, enabling on-site monitoring of pesticide levels in plants. This work presents a straightforward, sensitive, and efficient biosensors to analysis pesticide, which holds potential for application in detecting other agrochemicals. Moreover, this advancement could significantly contribute to the progress of precision agriculture in the future.

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“…These results were compatible with earlier reports. [31][32][33][34][35][36][37] In order to see the effect of ctdsDNA concentration upon the response of biosensor, ctdsDNA in various concentrations from 10 to 70 μg ml −1 was immobilized onto the surface of CA-GO-PGE, and accordingly the changes at the oxidation and reduction signals of [Fe(CN) 6 ] 3−/4− was examined by CV (Fig. 4).…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Monitoring of Interaction of Temozolamide with DNA by Graphene Oxide Modified Single-Use Electrodes

Ekşin

Isin

Ünal

et al. 2022

J. Electrochem. Soc.

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Graphene oxide (GO) modified single-use pencil graphite electrodes (PGEs) were used for electrochemical monitoring of surface confined interaction between Temozolamide (TMZ) and calf thymus double stranded DNA (ctdsDNA). First, the PGE surface was activated by EDC/NHS (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide/N-hydroxysuccinimide) as covalent agents (CA). Then, modification of GO was done onto the surface of chemically activated PGE surface to obtain CA-GO-PGEs. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy studies were used to establish the interfacial electron transfer of the electrodes. The optimization of experimental conditions was carried out via CV technique followed by electrochemical examination of the interaction of TMZ with ctdsDNA.

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Reduced Graphene Oxide/Gold Nanoparticles Modified Screen‐Printed Electrode for the Determination of Palmitic Acid

Cited by 9 publications

References 34 publications

Rapid and sensitive detection of box turtles using an electrochemical DNA biosensor based on a gold/graphene nanocomposite

Rapid and sensitive detection of box turtles using an electrochemical DNA biosensor based on a gold/graphene nanocomposite

Wearable Electrochemical Biosensors for In Situ Pesticide Analysis from Crops

Electrochemical Monitoring of Interaction of Temozolamide with DNA by Graphene Oxide Modified Single-Use Electrodes

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