Functional Co3O4 nanostructure-based electrochemical sensor for direct determination of ascorbic acid in pharmaceutical samples

2021 ◽  
Author(s):  
Nadir H. Khand ◽  
Ismail M. Palabiyik ◽  
Jamil A. Buledi ◽  
Sidra Ameen ◽  
Almas F. Memon ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Electrochemical Sensor ◽  
Direct Determination ◽  
Pharmaceutical Samples

3DGH-Fc based electrochemical sensor for the simultaneous determination of ascorbic acid, dopamine and uric acid

2017 ◽  
Vol 799 ◽  
pp. 459-467 ◽  
Author(s):  
Qing Zhu ◽  
Jing Bao ◽  
Danqun Huo ◽  
Mei Yang ◽  
Huixiang Wu ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Electrochemical Sensor ◽  
Simultaneous Determination

A new electrochemical sensor based on carbon black modified with palladium nanoparticles for direct determination of 17α‐ethinylestradiol in real samples

2021 ◽  
Author(s):  
Juliana Fernandes ◽  
Julia Fernandes ◽  
Cassiano Bernardino ◽  
Claudio Mahler ◽  
Bernardo Braz ◽  
...  
Keyword(s):  
Carbon Black ◽  
Electrochemical Sensor ◽  
Palladium Nanoparticles ◽  
Direct Determination ◽  
Real Samples

scholarly journals Direct Determination of Ascorbic Acid in a Grapefruit: Paving the Way for In Vivo Spectroelectrochemistry

2017 ◽  
Vol 89 (3) ◽  
pp. 1815-1822 ◽  
Author(s):  
Jesus Garoz-Ruiz ◽  
Aranzazu Heras ◽  
Alvaro Colina
Keyword(s):  
Ascorbic Acid ◽  
Direct Determination ◽  
The Way

scholarly journals An Electrochemical Sensor Based On Graphite Electrode Modified With Silica Containing 1-N-Propyl-3-Methylimidazolium Species For Determination Of Ascorbic Acid

2019 ◽  
Vol Vol. 14, No.1 ◽  
pp. 5-14 ◽  
Author(s):  
Anastasiya Tkachenko ◽  
Mykyta Onizhuk ◽  
Oleg Tkachenko ◽  
Leliz T. Arenas ◽  
Edilson V. Benvenutt ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Cyclic Voltammetry ◽  
Electrochemical Sensor ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Pharmaceutical Formulations ◽  
Differential Pulse ◽  
Long Term Stability ◽  
Diffusion Limited

In the present study, an electrochemical sensor based on the electrode (SiMImCl/C) consisting of graphite and silica, grafted with 1-n-propyl-3-methylimidazolium chloride was used for ascorbic acid (AA) quantification in pharmaceuticals and food formulations. Cyclic voltammetry and electrochemical impedance spectroscopy were applied for electrochemical characterization of the SiMImCl/C electrode. The cyclic voltammetry study revealed that the oxidation of AA on this electrode is an irreversible process, realized by adsorption and diffusion limited step. The differential pulse voltammetry was applied to develop a procedure for the AA determination. The linear range was found to be 0.3–170 μmol L-1 and the limit of detection – 0.1 μmol L-1. The proposed SiMImCl/C electrode has long term stability and does not show electrochemical activity towards the analytes, which commonly coexist with AA. The sensor was successfully used for quantification of AA in food and pharmaceutical formulations.

scholarly journals Voltammetric Determination of Phenylalanine Using Chemically Modified Screen-Printed Based Sensors

Chemosensors ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 113
Author(s):  
Ancuta Dinu ◽  
Constantin Apetrei
Keyword(s):  
Prussian Blue ◽  
Direct Determination ◽  
Standard Addition ◽  
Pharmaceutical Products ◽  
Electrochemical Process ◽  
Pharmaceutical Samples ◽  
Analytical Recovery ◽  
Relative Standard ◽  
Screen Printed

This paper describes the sensitive properties of screen-printed carbon electrodes (SPCE) modified by using three different electroactive chemical compounds: Meldola’s Blue, Cobalt Phthalocyanine and Prussian Blue, respectively. It was demonstrated that the Prussian Blue (PB) modified SPCE presented electrochemical signals with the highest performances in terms of electrochemical process kinetics and sensitivity in all the solutions analyzed. PB-SPCE was demonstrated to detect Phe through the influence it exerts on the redox processes of PB. The PB-SPCE calibration have shown a linearity range of 0.33–14.5 µM, a detection limit (LOD) of 1.23 × 10−8 M and the standard deviation relative to 3%. The PB-SPCE sensor was used to determine Phe by means of calibration and standard addition techniques on pure samples, on simple pharmaceutical samples or on multicomponent pharmaceutical samples. Direct determination of the concentration of 4 × 10−6–5 × 10−5 M Phe in KCl solution showed that the analytical recovery falls in the range of 99.75–100.28%, and relative standard deviations in the range of 2.28–3.02%. The sensors were successfully applied to determine the Phe in pharmaceuticals. The validation of the method was performed by using the FTIR, and by comparing the results obtained by PB-SPCE in the analysis of three pharmaceutical products of different concentrations with those indicated by the producer.

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