scholarly journals Electrocoating Polypyrrole on Gold-Wire Electrode as Potential Mediator Membrane Candidate for Anionic Surfactant Electrode Sensor

2020 ◽  
Vol 23 (5) ◽  
pp. 167-176
Author(s):  
Abdul Haris Watoni ◽  
Indra Noviandri ◽  
Muhammad Nurdin ◽  
La Ode Ahmad Nur Ramadhan
Keyword(s):  
Cyclic Voltammetry ◽  
Conducting Polymer ◽  
Limit Of Detection ◽  
Supporting Electrolyte ◽  
Sodium Dodecyl ◽  
Gold Wire ◽  
Potential Range ◽  
Wire Electrode ◽  
Potential Response ◽  
Potential Mediator

The development of polypyrrole as a potential mediator membrane candidate for sodium dodecyl sulfate (SDS) sensor electrode has been investigated. The polypyrrole membrane was synthesized electrochemically from the pyrrole and coated at the surface of a 1.0 mm diameter of the gold-wire electrode. Electropolymerization of pyrrole and coating of the polypyrrole produced was performed by cyclic voltammetry technique in the electrochemical cell containing supporting electrolyte of 0.01 M NaClO4 with an optimum potential range of -0.9 V–1.0 V, the scanning rate of 100 mV/s, an electric current of 2 mA, and running of potential scanning of 10 cycles. By using the similar optimal parameters of cyclic voltammetry, electropolymerization of 0.01 M pyrrole solution containing 0.001 M SDS also produces a polypyrrole membrane coated at the gold-wire electrode surface. These coated electrodes have the potential response-ability toward DS- anions in the concentration range of 10-7 M–10-5 M with a limit of detection of 10-7 M and sensitivity of electrode of 9.9 mV/decade. This finding shows that the SDS solution’s role is as supporting electrolyte and also as a source of DS- dopant during the pyrrole electropolymerization processes. Dopants are trapped in the polymer membrane during the electrochemical formation of polypyrrole and role as ionophores for DS- anion in the analyte solution. A potential response to the electrode phenomena is excellent basic scientific information for further synthesis of conducting polymer and development of conducting polymer-coated wire electrode model, especially in the construction of ion-selective electrode (ISE) for the determination of anionic surfactants with those models.

scholarly journals Detection of Glyphosate in Drinking Water: A Fast and Direct Detection Method without Sample Pretreatment

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2961 ◽  
Author(s):  
Jafar Noori ◽  
Maria Dimaki ◽  
John Mortensen ◽  
Winnie Svendsen
Keyword(s):  
Drinking Water ◽  
Limit Of Detection ◽  
Direct Detection ◽  
Tap Water ◽  
Supporting Electrolyte ◽  
Sample Pretreatment ◽  
The United States ◽  
Electrochemical Sensing ◽  
Potential Range ◽  
Measured Signal

Glyphosate (Gly) is one of the most problematic pesticides that repeatedly appears in drinking water. Continuous on-site detection of Gly in water supplies can provide an early warning in incidents of contamination, before the pesticide reaches the drinking water. Here, we report the first direct detection of Gly in tap water with electrochemical sensing. Gold working electrodes were used to detect the pesticide in spiked tap water without any supporting electrolyte, sample pretreatment or electrode modifications. Amperometric measurements were used to quantify Gly to a limit of detection of 2 μM, which is below the regulation limit of permitted contamination of drinking water in the United States. The quantification of Gly was linearly proportional with the measured signal. The selectivity of this method was evaluated by applying the same technique on a Gly Metabolite, AMPA, and on another pesticide, omethoate, with a chemical structure similar to Gly. The testing revealed no interfering electrochemical activity at the potential range used for Gly detection. The simple detection of Gly presented in this work may lead to direct on-site monitoring of Gly contamination at drinking water sources.

scholarly journals Polypyrrole Fibre Electrodes for Drug Sensing

Proceedings ◽  
2020 ◽  
Vol 32 (1) ◽  
pp. 20 ◽  
Author(s):  
Sutthima Sriprasertsuk ◽  
John R. Varcoe ◽  
Carol Crean
Keyword(s):  
Ascorbic Acid ◽  
Cyclic Voltammetry ◽  
Sodium Dodecyl Sulfate ◽  
Carbon Fibre ◽  
Limit Of Detection ◽  
Sodium Dodecyl ◽  
Potassium Nitrate ◽  
Oxidation Peak ◽  
Fibre Sensor ◽  
Model Drug

Polypyrrole (PPy) fibre electrodes and their ability to sense paracetamol (as a model drug) in addition to interferents such as ascorbic acid and dopamine were studied. PPy was electrodeposited onto carbon fibre (CF) through electropolymerisation using cyclic voltammetry in the presence of two different counter anions: potassium nitrate (KNO3) and sodium dodecyl sulfate (SDS). PPy with SDS as dopant could sense paracetamol with an oxidation peak at 0.55 V vs. Ag/AgCl. The limit of detection of this fibre sensor was found to be 1 µM with a linear range of 1–100 µM of paracetamol (R2 = 0.985).

Electrochemical Response of Gold Nanoparticles at a Graphite Electrode

2014 ◽  
Vol 1040 ◽  
pp. 297-302 ◽  
Author(s):  
D.O. Perevezentseva ◽  
E.V. Gorchakov
Keyword(s):  
Gold Nanoparticles ◽  
Cyclic Voltammetry ◽  
Electrochemical Oxidation ◽  
Phase Structure ◽  
Graphite Electrode ◽  
Supporting Electrolyte ◽  
Potential Range ◽  
Cyclic Voltammogram ◽  
Cathodic Peak ◽  
Graphite Electrodes

The electrochemical activity of gold nanoparticles at graphite electrodes by the method of cyclic voltammetry is studied. In this article the nature of the supporting electrolyte, modification time of graphite electrode by gold nanoparticles and the potential range on the value of the “inverse” cathodic peak are investigated. The “inverse” cathodic peak of gold nanoparticles formed in the reaction mixture HAuCl4:Na3C6H5O7:NaBH4=1:1:4 is observed on the cathodic branch of cyclic voltamperegram at Ec = 0.05 V at graphite electrode. The mechanism of stepwise electrochemical oxidation and reduction of the phase structure of gold on the surface of the graphite electrode in 0.1 M NaOH is offered. The “inverse” cathodic peak of gold nanoparticles on the cathodic branch of cyclic voltammogram at graphite electrode is caused by oxidation of Au2O to Au2O3.<br /><br />

scholarly journals Novel all-solid contact Copper (II) - selective sensor based on Cefoperazone and poly (3,4 -ethylenedioxythiophene) (PEDOT) as conducting polymer

2016 ◽  
Vol 1 (1) ◽  
pp. 19-29
Author(s):  
Alaa O. Abd El-Aziz ◽  
Farida M. S. E. El-Dars ◽  
Abdellatef A.A. Radowan
Keyword(s):  
Conducting Polymer ◽  
Gold Wire ◽  
Wire Electrode ◽  
Solid Contact ◽  
Solid Electrode ◽  
Potentiometric Selectivity ◽  
Lower Detection ◽  
Ph Range ◽  
Analytical Utility ◽  
Selective Sensor

A potentiometric all-solid contact copper (II) selective sensor based on Cefoperazone as a neutral carrier was developed. The electrode was prepared by coating the membrane solution containing PVC, plasticizer, and carrier on the surface of gold wire electrode. The coated gold Wire electrode (CGWE) exhibited a linear response of 31.01± 0.1 mV/decade over the range of 1.0x10–8  – 1.0 x10–2 Cu (II) mol.L-1, and lower detection limit (LDL) 4.0 x 10–9 mol.L-1. The solid-contact Cu (II) solid electrode with conducting polymer poly (3,4-ethylenedioxythiophene) (PEDOT), as intermediate layer has been successfully used to detect ions at nanomolar level concentrations. The electrode has a response time between 5-10 s and was suitable for Cu (II) determination in aqueous solution over pH range (4.0–7.0). It was found to be selective towards Cu (II) ions over other common cations and the relevant potentiometric selectivity coefficients were calculated. The analytical utility of the proposed electrode was also demonstrated.

scholarly journals An improved non-enzymatic electrochemical sensor amplified with CuO nanostructures for sensitive determination of uric acid

2021 ◽  
Vol 19 (1) ◽  
pp. 481-491
Author(s):  
Jamil A. Buledi ◽  
Sidra Ameen ◽  
Saba A. Memon ◽  
Almas Fatima ◽  
Amber R. Solangi ◽  
...  
Keyword(s):  
Uric Acid ◽  
Copper Oxide ◽  
Dynamic Range ◽  
Limit Of Detection ◽  
Supporting Electrolyte ◽  
Electrochemical Determination ◽  
Potential Range ◽  
Oxide Nanostructures ◽  
Growth Method

Abstract This study displays the facile and fluent electrochemical determination of uric acid (UA) through exceptional copper oxide nanostructures (CuO), as an effective sensing probe. The copper oxide nanostructures were fabricated via an aqueous chemical growth method using sodium hydroxide as a reducing agent, which massively hold hydroxide source. Copper oxide nanostructures showed astonishing electrocatalytic behavior in the detection of UA. Different characterization techniques such as XRD, FESEM, and EDS were exploited to determine crystalline nature, morphologies, and elemental composition of synthesized nanostructures. The cyclic voltammetry (CV) was subjected to investigate the electrochemical performance of UA using copper oxide nanostructures modified glassy carbon electrode CuO/GCE. The CV parameters were optimized at a scan rate of 50 mV/s with −0.7 to 0.9 potential range, and the UA response was investigated at 0.4 mV. PBS buffer of pH 7.4 was exploited as a supporting electrolyte. The linear dynamic range for UA was 0.001–351 mM with a very low limit of detection observed as 0.6 µM. The proposed sensor was successfully applied in urine samples for the detection of UA with improved sensitivity and selectivity.

scholarly journals ELECTROCHEMICAL SYNTHEZIS AND CHARACTERIZATION OF POLYPYRROLE FOR DODECYLSULFATE SENSOR MEMBRANE

2010 ◽  
Vol 7 (3) ◽  
pp. 249-253 ◽  
Author(s):  
Abdul Haris Watoni ◽  
Suryo Gandasasmita ◽  
Indra Noviandri ◽  
Buchari Buchari
Keyword(s):  
Aqueous Solution ◽  
Cyclic Voltammetry ◽  
Detection Limit ◽  
Supporting Electrolyte ◽  
Linear Potential ◽  
Potential Response ◽  
Real Samples ◽  
Sensor Membrane ◽  
Pyrrole Monomer

A conducting polymer, polypyrrole, has been electrochemically synthesized from pyrrole monomer using cyclic voltammetry technique in aqueous solution in the presence of HDS dopant and KNO3 supporting electrolyte. The polymer was deposited on the surface of an Au-wire and the modified electrode obtained was then used as dodecylsulfate (DS-) ion sensor electrode. The best performance PPy-DS modified-Au electrode conditioned in the air system without HDS or SDS solution gave linear potential response for the concentration range of 1.0 x 10-5 - 1.0 x 10-3 M, sensitivity of 54.5 mV/decade, detection limit of 1.0 x 10-5 M, and response time of 23 - 30 second.  The electrode showed good selectivity towards other anions, therefore can be used to determine SDS concentration in real samples system without any change of the samples matrix.   Keywords: polypyrrole, SDS, cyclic voltammetry

scholarly journals STUDY OF LYSINE AND ALANINE DELIVERANCE THROUGH POLYPYRROLE MEMBRANE

2010 ◽  
Vol 4 (3) ◽  
pp. 186-191
Author(s):  
Adhitasari Suratman ◽  
Buchari Buchari ◽  
Indra Noviandri ◽  
Suryo Gandasasmita
Keyword(s):  
Cyclic Voltammetry ◽  
Supporting Electrolyte ◽  
Sodium Perchlorate ◽  
Reference Electrode ◽  
Potential Range ◽  
Positive Potential ◽  
Scanning Rate ◽  
Transfer Processes ◽  
Water Based

Electropolymerization processes of pyrrole and the usage of polypyrrole membrane as lysine and alanine deliverance have been studied by cyclic voltammetry technique. Polypyrrole membrane was prepared by electropolymerization processes of pyrrole in water based solvent containing sodium perchlorate as supporting electrolyte. Electropolymerization processes were carried out within potential range of 0-1100 mV vs Ag/AgCl reference electrode and at the scanning rate of 100 mV/s. In this study, lysine and alanine have been used as molecules which could easily be loaded on and released from polypyrrole membrane. The presence of lysine or alanine during electropolymerization process reduced the rate of electropolymerization of polypyrrole. In lysine or alanine transfer processes into polypyrrole membrane, the interaction between polypyrrole and lysine or alanine showed by the curve of E½ oxidation in respect of - log C. It proved that the E½ oxidation shifted to more positive potential showed by the increasing of concentration of lysine or alanine. Beside that, voltammetric responses of lysine and alanine transfered into polypyrrole membrane were found to be Nernstian. The results indicated that polypyrrole could be used as a sensor of lysine and alanine.   Keywords: Electropolymerization, polypyrrole membrane, voltammetry technique

scholarly journals Modification of Carbon Paste Electrode Using Calyx[6]Arene-TiO2 Nanocomposite for Determination of Cu2+ ion Based on Cyclic Voltammetry

2021 ◽  
Vol 12 (3) ◽  
pp. 2843-2851
Keyword(s):  
Cyclic Voltammetry ◽  
Carbon Paste Electrode ◽  
Limit Of Detection ◽  
Supporting Electrolyte ◽  
Rate Variation ◽  
Carbon Paste ◽  
Relative Standard ◽  
Scan Rate ◽  
Paste Electrode

In the present study, an electrochemical sensor for the determination of Cu(II) ions in aqueous solutions was introduced. This study proposes an electrochemical method using the calyx [6]arene-TiO2 nanocomposite modified carbon paste electrode (calyx[6]arene-TiO2/CPE) for the determination of metal Cu2+ ion. Calyx[6]arene-TiO2 were synthesized using the hydrolysis method as the Cu-binding ionophore. The electrode surface was studied by scanning electron microscopy (SEM), and the reduction and oxidation processes were studied by cyclic voltammetry (CV) techniques. The effect of modifier composition, scan rate, variation concentration, repeatability, and type of supporting electrolyte on the determination of metal ions was investigated. The best composition was 0.005 g calyx[6]arene-TiO2 in the carbon paste electrode with a scan rate of 0.5 V/s. The modified electrodes showed good performance for Cu2+ ion detection. Under optimum experimental conditions, a linear range for metal Cu(II) ions was from 0.1, 0.3, 0.5, 0.8, and 1.0 ppm with respective currents of 500, 550, 600, 700, and 800 µA. The limit of detection (LOD) for metal Cu2+ ions is found to be 0.022 ppm with a relative standard deviation (%RSD) of 0.011%.

Eco-Friendly Green Liquid Chromatographic Separations of a Novel Combination of Azelastine and Fluticasone in the Presence of their Pharmaceutical Dosage form Additives

2020 ◽  
Vol 16 (3) ◽  
pp. 277-286
Author(s):  
Amal A. El-Masry ◽  
Mohammed E. A. Hammouda ◽  
Dalia R. El-Wasseef ◽  
Saadia M. El-Ashry
Keyword(s):  
Lower Limit ◽  
Dosage Form ◽  
Limit Of Detection ◽  
Sodium Dodecyl ◽  
Uv Detection ◽  
Simultaneous Estimation ◽  
Limit Of Quantification ◽  
Chromatographic Separations ◽  
Pharmaceutical Dosage Form ◽  
Liquid Chromatographic

Background: The first highly sensitive, rapid and specific green microemulsion liquid chromatographic (MELC) method was established for the simultaneous estimation of fluticasone propionate (FLU) and azelastine HCl (AZL) in the presence of their pharmaceutical dosage form additives (phenylethyl alcohol (PEA) and benzalkonium chloride (BNZ)). Methods: The separation was performed on a C18 column using (o/w) microemulsion as a mobile phase which contains 0.2 M sodium dodecyl sulphate (SDS) as surfactant, 10% butanol as cosurfactant, 1% n-octanol as internal phase and 0.3% triethylamine (TEA) adjusted at pH 6 by 0.02 M phosphoric acid; with UV detection at 220 nm and programmed with flow rate of 1 mL/min. Results: The validation characteristics e.g. linearity, lower limit of quantification (LOQ), lower limit of detection (LOD), accuracy, precision, robustness and specificity were investigated. The proposed method showed linearity over the concentration range of (0.5-25 µg/mL) and (0.1-25 µg/mL) for FLU and AZL, respectively. Besides that, the method was adopted in a short chromatographic run with satisfactory resolution factors of (2.39, 3.78 and 6.74 between PEA/FLU, FLU/AZL and AZL/BNZ), respectively. The performed method was efficiently applied to pharmaceutical nasal spray with (mean recoveries ± SD) (99.80 ± 0.97) and (100.26 ± 0.96) for FLU and AZL, respectively. Conclusion: The suggested method was based on simultaneous determination of FLU and AZL in the presence of PEA and BNZ in pure form, laboratory synthetic mixture and its combined pharmaceutical dosage form using green MELC technique with UV detection. The proposed method appeared to be superior to the reported ones of being more sensitive and specific, as well as the separation was achieved with good performance in a relatively short analysis time (less than 7.5 min). Highly acceptable values of LOD and % RSD make this method superior to be used in quality control laboratories with of HPLC technique.

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