A DNA biosensor based on graphene paste electrode modified with Prussian blue and chitosan

The Analyst ◽  
2011 ◽  
Vol 136 (9) ◽  
pp. 1946 ◽  
Author(s):  
Yang Bo ◽  
Weiqi Wang ◽  
Junfei Qi ◽  
Shasheng Huang
Keyword(s):  
Prussian Blue ◽  
Dna Biosensor ◽  
Graphene Paste Electrode ◽  
Paste Electrode

scholarly journals Poly (Adenine) Modified Graphene-Based Voltammetric Sensor for the Electrochemical Determination of Catechol, Hydroquinone and Resorcinol

2020 ◽  
Vol 14 (1) ◽  
pp. 52-62 ◽  
Author(s):  
Jamballi G. Manjunatha
Keyword(s):  
Differential Pulse ◽  
Electrochemical Determination ◽  
Repeatability And Reproducibility ◽  
Pulse Voltammetry ◽  
The Stability ◽  
Graphene Paste Electrode ◽  
Modified Graphene ◽  
Paste Electrode ◽  
Voltammetric Technique

Objective: This paper presents the application of Poly (Adenine) Modified Graphene Paste Electrode (PAMGPE) for the analysis of Catechol (CC) with Resorcinol (RC) and Hydroquinone (HQ) by a voltammetric technique. Methods: Electropolymerization technique was utilized for the modification of the sensor surface. The electrode surface was characterized by Field Emission Scanning Electron Microscopy (FE-SEM). Cyclic Voltammetry (CV) and Differential Pulse Voltammetry (DPV) were used to study the redox behavior of CC, RC and HQ. Results: Oxidation peak current of CC increased linearly with the concentration of CC in the range from 2×10-6- 8×10-6 M and 1×10-5-1.5 ×10-4 M with a detection limit of 2.4×10-7 M. The practical application of the developed sensor was verified as exact for the determination of CC in water sample. Conclusion: The stability, repeatability, and reproducibility of the developed electrode were studied and established good characteristics. Furthermore, the PAMGPE was examined for the simultaneous determination of CC, RC and HQ.

scholarly journals Fabrication of Efficient and Selective Modified Graphene Paste Sensor for the Determination of Catechol and Hydroquinone

Surfaces ◽  
2020 ◽  
Vol 3 (3) ◽  
pp. 473-483
Author(s):  
Jamballi G. Manjunatha
Keyword(s):  
Modified Electrode ◽  
High Sensitivity ◽  
Differential Pulse ◽  
Official Method ◽  
Limit Of Quantification ◽  
Selective Determination ◽  
Graphene Paste Electrode ◽  
Modified Graphene ◽  
Paste Electrode

An electrochemical sensor, based on a graphene paste electrode (GPE), was modified with a polymerization method, and the electrochemical behavior of catechol (CC) and hydroquinone (HQ) was investigated using electroanalytical methods like cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The effect of CC at the modified electrode was evidenced by the positive shift of the oxidation peak potential of CC at the poly (rosaniline)-modified graphene paste electrode (PRAMGPE) and the nine-fold enhancement of the peak current, as compared to a bare graphene paste electrode (BGPE). The sensitivity of CC investigated by DPV was more sensitive than CV for the analysis of CC. The DPV method showed the two linear ranges of 2.0 × 10−6–1.0 × 10−5 M and 1.5 × 10−5–5 × 10−5 M. The detection limit and limit of quantification were determined to be 8.2 × 10−7 and 27.6 × 10−7 M, respectively. The obtained results were compared successfully with respect to those obtained using the official method. Moreover, this sensor is applied for the selective determination of CC in the presence of HQ. The high sensitivity, good reproducibility, and wide linear range make the modified electrode suitable for the determination of CC in real samples. The practical application of the sensor was demonstrated by determining the concentration of CC in water samples with acceptable recoveries (97.5–98%).

Preparation of Ag/NaA zeolite modified carbon paste electrode as a DNA biosensor

2013 ◽  
Vol 181 ◽  
pp. 319-325 ◽  
Author(s):  
Seyed Naser Azizi ◽  
Sara Ranjbar ◽  
Jahan Bakhsh Raoof ◽  
Ezat Hamidi-Asl
Keyword(s):  
Carbon Paste Electrode ◽  
Dna Biosensor ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Naa Zeolite ◽  
Paste Electrode
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