Application of a new fiber coating based on electrochemically reduced graphene oxide for the cold-fiber headspace solid-phase microextraction of tricyclic antidepressants

2014 ◽  
Vol 37 (9-10) ◽  
pp. 1162-1169 ◽  
Author(s):  
Mohammad Hossein Banitaba ◽  
Saied Saeed Hosseiny Davarani ◽  
Hamid Ahmar ◽  
Siyavash Kazemi Movahed
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Solid Phase Microextraction ◽  
Tricyclic Antidepressants ◽  
Solid Phase ◽  
Headspace Solid Phase Microextraction ◽  
Fiber Coating ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

scholarly journals Reduced Graphene Oxide-Cadmium Sulfide Quantum Dots Nanocomposite Based Dispersive Solid Phase Microextraction for Ultra-Trace Determination of Carbamazepine and Phenobarbital

2021 ◽  
Author(s):  
Ali Shafiee ◽  
Behzad Aibaghi ◽  
Xu Zhang
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Cadmium Sulfide ◽  
Reduced Graphene Oxide ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Uv Detector ◽  
Reduced Graphene ◽  
Ultra Trace

This research presents a fast, sensitive, and selective ultrasound-assisted dispersive solid phase microextraction technique for simultaneous preconcentration and determination of ultra-trace amount of carbamazepine and phenobarbital. Reduced graphene oxide sheets decorated with cadmium sulfide quantum dots was synthesized, characterized, and used as a high capacity adsorbent. A high performance liquid chromatography with UV detector (HPLC-UV) instrument with 58:42 composition of methanol:acetic acid/acetate buffer (pH = 5; 0.05 mol L-1) as the mobile phase and set on the wavelength of 230 nm was used to separate and quantify the analytes. In this regard, different parameters affecting adsorption and desorption of the analytes on the surface of the nanocomposite were studied and optimized to maximize the efficiency of the method. The method was linear in the ranges of 0.5-180 and 0.5-140 ng mL−1 (correlation coefficient (r) > 0.999) with limits of detection of 0.19 and 0.24 ng mL−1 for carbamazepine and phenobarbital, respectively. Eventually, to evaluate the efficiency of the proposed method for the determination of pharmaceuticals in biological samples, different real samples including breast milk, urine and human plasma were tested. Obtained recoveries values were within the range of 96.3 ± 2 to 103.7 ± 3.3% which showed satisfactory efficiency.

Self-supported 3D reduced graphene oxide for solid-phase extraction: An efficient and low-cost sorbent for environmental contaminants in aqueous solution

Talanta ◽  
2021 ◽  
pp. 122750
Author(s):  
Raimara de Souza Gomes ◽  
Anderson Thesing ◽  
Jacqueline Ferreira Leite Santos ◽  
Andreia Neves Fernandes
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Solid Phase Extraction ◽  
Reduced Graphene Oxide ◽  
Solid Phase ◽  
Low Cost ◽  
Environmental Contaminants ◽  
Phase Extraction ◽  
Reduced Graphene

scholarly journals Simultaneous Determination of Uric Acid and Xanthine Using a Poly(Methylene Blue) and Electrochemically Reduced Graphene Oxide Composite Film Modified Electrode

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Gen Liu ◽  
Wei Ma ◽  
Yan Luo ◽  
Deng-ming Sun ◽  
Shuang Shao
Keyword(s):  
Methylene Blue ◽  
Uric Acid ◽  
Graphene Oxide ◽  
Composite Film ◽  
Simultaneous Determination ◽  
Reduced Graphene Oxide ◽  
Modified Electrode ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

Poly(methylene blue) and electrochemically reduced graphene oxide composite film modified electrode (PMB-ERGO/GCE) was successfully fabricated by electropolymerization and was used for simultaneous determination of uric acid (UA) and xanthine (Xa). Based on the excellent electrocatalytic activity of PMB-ERGO/GCE, the electrochemical behaviors of UA and Xa were studied by cyclic voltammetry (CV) and square wave voltammetry (SWV). Two anodic sensitive peaks at 0.630 V (versus Ag/AgCl) for UA and 1.006 V (versus Ag/AgCl) for Xa were given by CV in pH 3.0 phosphate buffer. The calibration curves for UA and Xa were obtained in the range of 8.00 × 10−8~4.00 × 10−4 M and 1.00 × 10−7~4.00 × 10−4 M, respectively, by SWV. The detection limits for UA and Xa were3.00×10-8 M and5.00×10-8 M, respectively. Finally, the proposed method was applied to simultaneously determine UA and Xa in human urine with good selectivity and high sensitivity.

Novel determination of hydrogen peroxide by electrochemically reduced graphene oxide grafted with aminothiophenol–Pd nanoparticles

2013 ◽  
Vol 178 ◽  
pp. 450-457 ◽  
Author(s):  
Jung-Min You ◽  
Daekun Kim ◽  
Seul Ki Kim ◽  
Min-Su Kim ◽  
Hyoung Soon Han ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Pd Nanoparticles ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide
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