Electrochemical preparation of cobalt hexacyanoferrate nanoparticles under the synergic action of EDTA and overoxidized polypyrrole film

2012 ◽  
Vol 85 ◽  
pp. 650-658 ◽  
Author(s):  
Hao Yu ◽  
Yi Wang ◽  
Yuan-Yuan Lian ◽  
Shi-Wen Song ◽  
Zhen-Ye Liu ◽  
...  
Keyword(s):  
Electrochemical Preparation ◽  
Cobalt Hexacyanoferrate ◽  
Polypyrrole Film ◽  
Overoxidized Polypyrrole

scholarly journals Assay of Phospholipase D Activity by an Amperometric Choline Oxidase Biosensor

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1304 ◽  
Author(s):  
Rosanna Ciriello ◽  
Antonio Guerrieri
Keyword(s):  
Phospholipase D ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Fast Response ◽  
Borate Buffer ◽  
Choline Oxidase ◽  
Linear Calibration ◽  
Real Sample Analysis ◽  
Polypyrrole Film ◽  
Overoxidized Polypyrrole

A novel electrochemical method to assay phospholipase D (PLD) activity is proposed based on the employment of a choline biosensor realized by immobilizing choline oxidase through co-crosslinking on an overoxidized polypyrrole film previously deposited on a platinum electrode. To perform the assay, an aliquot of a PLD standard solution is typically added to borate buffer containing phosphatidylcholine at a certain concentration and the oxidation current of hydrogen peroxide is then measured at the rotating modified electrode by applying a detection potential of +0.7 V vs. SCE. Various experimental parameters influencing the assay were studied and optimized. The employment of 0.75% (v/v) Triton X-100, 0.2 mM calcium chloride, 5 mM phosphatidylcholine, and borate buffer at pH 8.0, ionic strength (I) 0.05 M allowed to achieve considerable current responses. In order to assure a controlled mass transport and, at the same time, high sensitivity, an electrode rotation rate of 200 rpm was selected. The proposed method showed a sensitivity of 24 (nA/s)⋅(IU/mL)−1, a wide linear range up to 0.33 IU/mL, fast response time and appreciable long-term stability. The limit of detection, evaluated from the linear calibration curve, was 0.005 IU/mL (S/N = 3). Finally, due to the presence of overoxidized polypyrrole film characterized by notable rejection properties towards electroactive compounds, a practical application to real sample analysis can be envisaged.

Preparation of sulfonated overoxidized polypyrrole film applicable as an SPME tool for cationic analytes

2004 ◽  
Vol 570 (1) ◽  
pp. 6-12 ◽  
Author(s):  
Tamer Uğur ◽  
Şahin Yücel ◽  
Ertaş Nusret ◽  
Udum Yasemin ◽  
Pekmez Kadir ◽  
...  
Keyword(s):  
Polypyrrole Film ◽  
Overoxidized Polypyrrole ◽  
Cationic Analytes

Electrochemical preparation of ultrathin polypyrrole film at microarray electrodes

1991 ◽  
Vol 95 (23) ◽  
pp. 9042-9044 ◽  
Author(s):  
M. Nishizawa ◽  
M. Shibuya ◽  
T. Sawaguchi ◽  
T. Matsue ◽  
I. Uchida
Keyword(s):  
Electrochemical Preparation ◽  
Polypyrrole Film

Electrochemical preparation and characterization of a polypyrrole/nickel-cobalt hexacyanoferrate nanocomposite for supercapacitor applications

RSC Advances ◽  
2015 ◽  
Vol 5 (111) ◽  
pp. 91448-91456 ◽  
Author(s):  
Ali Asghar Ensafi ◽  
Najmeh Ahmadi ◽  
Behzad Rezaei
Keyword(s):  
Electrode Material ◽  
Conductive Polymer ◽  
Inorganic Compound ◽  
Electrochemical Preparation ◽  
Supercapacitor Application ◽  
Nickel Cobalt ◽  
Cobalt Hexacyanoferrate ◽  
Supercapacitor Applications

A new electrode material for supercapacitor application is introduced based on polypyrrole conductive polymer and nickel-cobalt hexacyanoferrate poly-nuclear inorganic compound.

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