scholarly journals Bare carbon electrodes as simple and efficient sensors for the quantification of caffeine in commercial beverages

2018 ◽  
Vol 5 (5) ◽  
pp. 172146 ◽  
Author(s):  
Luca Redivo ◽  
Miroslav Stredanský ◽  
Elisabetta De Angelis ◽  
Luciano Navarini ◽  
Marina Resmini ◽  
...  
Keyword(s):  
Glassy Carbon ◽  
High Performance ◽  
Cost Effective ◽  
Differential Pulse ◽  
Routine Analysis ◽  
Carbon Electrodes ◽  
Current Response ◽  
Chromatography Method ◽  
Glassy Carbon Electrodes ◽  
Relative Standard

Food quality control is a mandatory task in the food industry and relies on the availability of simple, cost-effective and stable sensing platforms. In the present work, the applicability of bare glassy carbon electrodes for routine analysis of food samples was evaluated as a valid alternative to chromatographic techniques, using caffeine as test analyte. A number of experimental parameters were optimized and a differential pulse voltammetry was applied for quantification experiments. The detection limit was found to be 2 × 10 −5  M (3σ criterion) and repeatability was evaluated by the relative standard deviation of 4.5%. The influence of sugars, and compounds structurally related to caffeine on the current response of caffeine was evaluated and found to have no significant influence on the electrode performance. The suitability of bare carbon electrodes for routine analysis was successfully demonstrated by quantifying caffeine content in seven commercially available drinks and the results were validated using a standard ultra-high performance liquid chromatography method. This work demonstrates that bare glassy carbon electrodes are a simple, reliable and cost-effective platform for rapid analysis of targets such as caffeine in commercial products and they represent therefore a competitive alternative to the existing analytical methodologies for routine food analysis.

Ultrasensitive Electrochemical Determination of Phosphate in water by Hydrophilic TiO2 modified Glassy Carbon Electrodes

2021 ◽  
Author(s):  
Yan Jin ◽  
Tong QI ◽  
Yuqing Ge ◽  
Jin Chen ◽  
Li juan Liang ◽  
...  
Keyword(s):  
Differential Pulse Voltammetry ◽  
Glassy Carbon ◽  
Differential Pulse ◽  
Electrochemical Determination ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Time Differential ◽  
Pulse Voltammetry ◽  
First Time

In this paper, ultrasensitive electrochemical determination of phosphate in water is achieved by hydrophilic TiO2 modified glassy carbon electrodes for the first time. Differential pulse voltammetry (DPV) method is proposed...

METHOD DEVELOPMENT AND VALIDATION OF OLANZAPINE IN PURE AND PHARMACEUTICAL DOSAGE FORM BY RP-HPLC METHOD

INDIAN DRUGS ◽  
2013 ◽  
Vol 50 (02) ◽  
pp. 20-26
Author(s):  
V.S Mastiholimath ◽  
◽  
P.M. Dandagi ◽  
A.P. Gadad ◽  
N.V Murali Krishna ◽  
...  
Keyword(s):  
High Performance ◽  
Dosage Form ◽  
Method Development ◽  
Limit Of Detection ◽  
Cost Effective ◽  
Hplc Method ◽  
Chromatography Method ◽  
Pharmaceutical Dosage Form ◽  
Relative Standard ◽  
Ammonium Hydrogen

A simple and reliable reverse phase high-performance liquid chromatography method was developed and validated for Olanzapine in pure and pharmaceutical dosage form. The method was developed on BDS Hypersil C18, (150 mm x 4.6 mm, 3μm) with a mobile phase of 0.01M tetra butyl ammonium hydrogen sulphate : methanol (80:20 v/v). The effluent was monitored by SPD-M20A, prominence UV-VIS detector at 234 nm. Calibration curve was linear over the concentration range of 10 –60μg/ml For interday and intraday precision % relative standard deviation values were found to be 0.18% and 0.24% respectively. Recovery of olanzapine was found to be in the range of 99.93 -100.00%. The limit of detection (LOD) and quantitation (LOQ) were 0.39275 and 1.1901μg/ml, respectively. The retention time and run time was very short; hence it is cost effective, making it more economical and rapid. Also this method can be used for the analysis of large number of samples.

Electrochemical Reduction and Detection of Nitrobenzene Based on Porphyrin Composite-modified Glassy Carbon Electrode

2014 ◽  
Vol 67 (5) ◽  
pp. 796 ◽  
Author(s):  
Zhonghua Xue ◽  
Huan Lian ◽  
Chenxian Hu ◽  
Yanjun Feng ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Glassy Carbon ◽  
Electrochemical Impedance ◽  
Signal To Noise Ratio ◽  
Differential Pulse ◽  
Field Analysis ◽  
Carbon Electrodes ◽  
Solution Ph ◽  
Sensitive Material ◽  
Glassy Carbon Electrodes ◽  
Ordered Mesoporous

An electrocatalytic platform and electrochemical sensor for nitrobenzene using tetra(4-methoxyphenyl) porphyrin-functionalized N-doped ordered mesoporous carbon (TMPP/N-OMC) as sensitive material is reported. Glassy carbon electrodes modified with TMPP/N-OMC were characterized by scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The electrode shows high electrocatalytic activity towards the reduction of nitrobenzene in sodium chloride solution (pH 7.00). Electrocatalytic reduction currents of nitrobenzene were found to be linearly related to concentration over the range 0.528 to 132.00 μM with a correlation coefficient of 0.9971 using a differential pulse voltammogram method. The detection limits were determined as 0.2162 μM at a signal-to-noise ratio of 3. The results show TMPP/N-OMC-modified glassy carbon electrodes open new opportunities for fast, simple, and sensitive field analysis of nitrobenzene.

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