scholarly journals Spot on Gold Nanoparticles/Silica Modified Electrode for Rapid Sensitive Determination of Dinoprostone

2019 ◽  
pp. 17-22 ◽  
Author(s):  
Shimaa A Atty ◽  
Mohammed Walash ◽  
Safaa Toubar ◽  
Maha M AbouEl-Alamin ◽  
Maha A Elabd ◽  
...  
Keyword(s):  
Modified Electrode ◽  
Pharmaceutical Preparation ◽  
Electrochemical Sensing ◽  
Modified Carbon Paste Electrode ◽  
Official Method ◽  
Carbon Paste ◽  
Experimental Conditions ◽  
Sensing Platform ◽  
Sensitive Determination

A novel simple and selective electrochemical procedure is utilized for the determination of Dinoprostone (DIN) in drug substance and pharmaceutical preparation with good recovery and without interference with other excipient. Herein, the electrochemical sensing platform based upon preparing gold nanoparticle sensor on silica modified carbon paste electrode. The surface morphology of the modified electrode was characterized by scanning electron microscope. Different experimental conditions, including electrode composition, effect of pH and scan rate were estimated carefully by cyclic voltammetry to obtain the highest electrochemical response. By using square wave voltammetry a good linear response was obtained in the range of, 2 x 10-5-4 x10-4 mol L-1, and 2 x 10-7-1.6 x 10-4 mol L-1, with low detection limit of 5 x 10-6 mol L-1, and 4.9 x 10-8 mol L-1 by CPE and GNP/SMCPE respectively. The obtained results are in good agreement with those obtained by official method. No electrochemical method was reported before for determination of DIN. The developed method was simple, rapid, economic and challenging to green analytical chemistry.

Kaolinite Modified Carbon Paste Electrode for the Sensitive Determination of Captopril

2017 ◽  
Vol 15 (4) ◽  
pp. 371-374 ◽  
Author(s):  
Saeed Ahmed Lakho ◽  
Sarfaraz Ahmed Mahesar ◽  
Abdul Rauf Khaskheli ◽  
Sirajuddin ◽  
Syed Tufail Hussain Sherazi ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Sensitive Determination ◽  
Paste Electrode

An electrochemical sensing platform amplified with a Au@Ag nanoparticle-decorated three-dimensional N-doped graphene aerogel for ultrasensitive determination of baicalein

2020 ◽  
Vol 44 (37) ◽  
pp. 15975-15982
Author(s):  
Xueliang Niu ◽  
Weili Zhang ◽  
Yan Huang ◽  
Likai Wang ◽  
Zhongfang Li ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Electrochemical Sensing ◽  
Ag Nanoparticle ◽  
Graphene Aerogel ◽  
Sensing Platform ◽  
Highly Sensitive ◽  
Signal Amplifier ◽  
Doped Graphene ◽  
Sensitive Determination

A novel electrochemical method for highly sensitive determination of baicalein was developed with Au@Ag/3DNGA as signal amplifier.

scholarly journals The determination of avidin in genetically modified maize by voltammetric techniques

2008 ◽  
Vol 53 (No. 8) ◽  
pp. 345-349 ◽  
Author(s):  
J. Petrlová ◽  
S. Křížková ◽  
V. Šupálková ◽  
M. Masařík ◽  
V. Adam ◽  
...  
Keyword(s):  
Plant Species ◽  
Electrochemical Sensors ◽  
Genetically Modified ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Food Ingredients ◽  
Voltammetric Techniques ◽  
Helianthus Annus ◽  
Sensitive Determination

Quality assurance is a major issue in the food industry. The authenticity of food ingredients and their traceability are required by consumers and authorities. Plant species such as barley (<i>Hordeum vulgare</i>), rice (<i>Oryza sativa</i>), sunflower (<i>Helianthus annus</i>), wheat (<i>Triticum aestivum</i>) and maize (<i>Zea mays</i>) are very common objects of interest of genetic modification (GMO); therefore the development of specific assays for their specific detection and quantification of GMO are needed. Furthermore, the production and trade of genetically modified lines from an increasing number of plant species brings about the need for control within research, environmental risk assessment, labeling-legal, and consumers’ information purposes. Electrochemical sensors and biosensors based on modification of working electrode could be suitable tools for these purposes. Here, we report using of an avidin-modified carbon paste electrode for rapid and sensitive determination of avidin in plant extract solution and in a transgenic maize extract. The process could be used to determine avidin concentrations up to 3pM in solution and 170nM in a maize seed extract. Moreover, we applied the method to analyze different maize flours.

Sensitive Electrochemical Determination of Hyperin Based on Electrochemically Activated ZrO2 Nanoparticles-Modified Carbon Paste Electrode

NANO ◽  
2019 ◽  
Vol 14 (05) ◽  
pp. 1950052 ◽  
Author(s):  
Na Wang ◽  
Jianyao Kou ◽  
Lijie Wang ◽  
Fei Wang ◽  
Kui Lu
Keyword(s):  
Carbon Paste Electrode ◽  
Electrochemical Treatment ◽  
Electrochemical Determination ◽  
Zro2 Nanoparticles ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
X Ray Diffraction ◽  
Sensitive Determination ◽  
Paste Electrode

A novel electrochemically activated ZrO2 nanoparticles modified carbon paste electrode (CPE) (ZrO2-CPE(ox)) was prepared and applied for selective and sensitive determination of hyperin. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectra and electrochemical experiment were used to characterize the ZrO2 nanoparticles and investigate the electrochemical performance of the ZrO2-CPE(ox). Compared with bare CPE and electrochemically activated CPE (CPE(ox)), the ZrO2-CPE(ox) got more reactive sites by electrochemical treatment and exhibited larger effective surface area and more excellent electrochemical catalytic activity toward the redox of hyperin. Under the optimum conditions, the oxidation peak currents showed a linear relationship with the concentrations of hyperin in the range of [Formula: see text]–[Formula: see text][Formula: see text]mol[Formula: see text]L[Formula: see text] and [Formula: see text]–[Formula: see text][Formula: see text]mol[Formula: see text]L[Formula: see text], and a low detection limit of [Formula: see text][Formula: see text]mol[Formula: see text]L[Formula: see text] was achieved for hyperin. Moreover, the proposed method exhibited an excellent selectivity, stability, reproducibility and repeatability, which make it very suitable for a potential choice for determining the concentrations of hyperin in drug matrices.

Non-enzymatic electrochemical sensing platform based on metal complex immobilized carbon nanotubes for glucose determination

RSC Advances ◽  
2016 ◽  
Vol 6 (108) ◽  
pp. 107094-107103 ◽  
Author(s):  
Piyush Kumar Sonkar ◽  
Vellaichamy Ganesan ◽  
S. Abraham John ◽  
Dharmendra Kumar Yadav ◽  
Rupali Gupta
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Electrochemical Sensing ◽  
Glucose Determination ◽  
Sensing Platform ◽  
New Material ◽  
Sensitive Determination ◽  
Human Blood Samples ◽  
Multiwall Carbon

Nickel salophen (where salophen is N,N′-bis(salicylidene)-1,2-phenylenediamine) is immobilized on multiwall carbon nanotubes. This new material is utilized for electrocatalytic oxidization and sensitive determination of glucose in human blood samples.

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