Highly Sensitive Determination of Theophylline Based on Graphene Quantum Dots Modified Electrode

Ganjali, Mohammad Reza

doi:10.20964/2018.03.09

Cited by 95 publications

(19 citation statements)

References 79 publications

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“…Moreover, due to the electroactive properties of levodopa and tryptophan, those can be determined by electrochemical methods. Electrochemical technique is a good alternative to the aforementioned methods due to the faster response, higher selectivity, higher sensitivity, reproducibility, easy operation and lower cost [10][11][12][13][14].…”

Section: Original Research Articlementioning

confidence: 99%

Simultaneous determination of levodopa and tryptophan using a modified glassy carbon electrode

Aflatoonian

Tajik

Ekrami‐Kakhki

et al. 2020

Eurasian Chem. Commun.

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This work discusses the development of a new sensor for simultaneous determination of levodopa and tryptophan. The proposed sensor was a glassy carbon electrode modified with V2O5 nanoparticles. Based on the excellent electrochemical properties of the modified electrode, a sensitive voltammetric method was used for individual and simultaneous determination of the levodopa and tryptophan in the aqueous solutions. The proposed method under the optimized conditions was utilized to determine the levodopa with linear range of 0.06-250.0 μM and detection limit of 0.02 μM (S/N=3). Finally, the applicability of the proposed sensor was verified by evaluation of levodopa and tryptophan in real sample.

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Section: Original Research Articlementioning

confidence: 99%

Simultaneous determination of levodopa and tryptophan using a modified glassy carbon electrode

Aflatoonian

Tajik

Ekrami‐Kakhki

et al. 2020

Eurasian Chem. Commun.

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“…This behavior could be due to the formation of UO 2 -I-TPB ion pairs in the membrane which diffused from organic phase to the organic/liquid phase interface and then dissociated slightly resulting in increasing UO 2 2 + concentration at the surface regions [33]. In addition, higher KTpClPB concentrations could lead to interferences as they might non-selectively compete with the ionophore [34].…”

Section: Optimization Of Membrane Compositionmentioning

confidence: 99%

Electrochemical Selective Determination of Uranyl Ions Using PVC Membrane Sensor

Akl

2017

Electroanalysis

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A UO22+‐PVC membrane electrode was constructed using 2‐thenoyltrifluoroacetone as ionophore and its electrochemical response performance was characterized. The effect of membrane composition on the electrode performance was studied and best results were obtained using dioctylsebacate as a mediator and potassium tetrakis(4‐chlorophenyl)borate as anion excluder. The optimized UO22+‐sensor exhibited a Nernstian response with a slope of 29.5±0.5 mV decade−1 over the concentration range 5.0×10−7−1.0×10−1 mol L−1 at 25 °C with a detection limit of 3.1×10−7 mol L−1. The optimized electrode showed very good selectivity towards UO22+ relative to a wide variety of other cations and fast response time. Surface morphology of the optimized membrane electrode at different stages of its development and use was investigated and discussed. Quantum chemical calculations for geometrical optimization of the ionophore were carried out to investigate the interaction between the ionophore and UO22+ using DFT B3LYP/6‐31++G(d,p) level of theory and the obtained data confirmed the proposed response mechanism. The developed sensor was successfully applied for UO22+ selective determination in real water samples and the obtained results were compared to those obtained by spectrophotometric method indicating no significant difference.

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“…Among the different binders tested DBS was found to be the most suitable one. Since the percentage of ionophore is known to strongly influence the sensitivity and selectivity of ISEs [18][19][20][21], the effect of ionophore percentage on the response of the CPE sensor incorporated SAB towards Nd(III) is also investigated and results are given in Table-2. From the data given in Table-2, it is obvious that the variation of ionophore percentage from 5 to 10 increases the working concentration range and slope of the sensor.…”

Section: Optimization Of Compositionmentioning

confidence: 99%

Chemically Modified Carbon Paste Sensor Based on N1,N2-Bis(salicylidine)butane-1,4-diamine for Determination of Nd(III)

Saraswathyamma¹,

Kumar²,

Shyama³

et al. 2017

Asian J. Chem.

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Fabrication of carbon paste sensor modified with N 1 ,N 2 -bis(salicylidine)butane-1,4-diamine (SAB) for Nd(III) has been demonstrated. The sensor having the composition of 90 % graphite and 10 % SAB exhibited best performance in the concentration range of 1.0 × 10 -6 to 1.0 × 10 -2 M. Nernstian slope of the sensor was found to be 19.5 ± 0.3 mV/decade. The sensor displayed fast response time of 10 s in the pH range 3.5 to 8.0. The detection limit is found to be 4.7 × 10 -7 M. The proposed sensor can be used over a period of 5 weeks without any significant changes in its Nerstian behaviour. The sensor showed good selectivity for neodymium in presence of other metal ions such as Na + , K + , Mg 2+ , Ca 2+ , Pb 2+ , Ag + , Pr 3+ , Sm 3+ , La 3+ and Gd 3+ . The practical utility of the developed sensor was investigated in the determination of neodymium in binary mixtures. This electrode is also utilized as an indicator electrode in the potentiometric titration of Nd(III) ions with EDTA.

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Highly Sensitive Determination of Theophylline Based on Graphene Quantum Dots Modified Electrode

Cited by 95 publications

References 79 publications

Simultaneous determination of levodopa and tryptophan using a modified glassy carbon electrode

Simultaneous determination of levodopa and tryptophan using a modified glassy carbon electrode

Electrochemical Selective Determination of Uranyl Ions Using PVC Membrane Sensor

Chemically Modified Carbon Paste Sensor Based on N1,N2-Bis(salicylidine)butane-1,4-diamine for Determination of Nd(III)

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