scholarly journals Formation of Polyaniline and Polypyrrole Nanocomposites with Embedded Glucose Oxidase and Gold Nanoparticles

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 377 ◽  
Author(s):  
Natalija German ◽  
Almira Ramanaviciene ◽  
Arunas Ramanavicius
Keyword(s):  
Gold Nanoparticles ◽  
Glucose Oxidase ◽  
Colloidal Gold ◽  
Sodium Acetate ◽  
Formation Rate ◽  
Bulk Composition ◽  
Enzymatic Polymerization ◽  
Polymerization Reaction ◽  
Sodium Acetate Buffer ◽  
Colloidal Gold Nanoparticles

Several types of polyaniline (PANI) and polypyrrole (Ppy) nanocomposites with embedded glucose oxidase (GOx) and gold nanoparticles (AuNPs) were formed by enzymatic polymerization of corresponding monomers (aniline and pyrrole) in the presence of 6 and 13 nm diameter colloidal gold nanoparticles (AuNPs(6nm) or AuNPs(13nm), respectively) or chloroaurate ions (AuCl4−). Glucose oxidase in the presence of glucose generated H2O2, which acted as initiator of polymerization reaction. The influence of polymerization bulk composition and pH on the formation of PANI- and Ppy-based nanocomposites was investigated spectrophotometrically. The highest formation rate of PANI- and Ppy-based nanocomposites with embedded glucose oxidase and gold nanoparticles (PANI/AuNPs-GOx and Ppy/AuNPs-GOx, respectively) was observed in the solution of sodium acetate buffer, pH 6.0. It was determined that the presence of AuNPs or AuCl4− ions facilitate enzymatic polymerization of aniline and pyrrole.

Glucose biosensor based on graphite electrodes modified with glucose oxidase and colloidal gold nanoparticles

2010 ◽  
Vol 168 (3-4) ◽  
pp. 221-229 ◽  
Author(s):  
Natalija German ◽  
Almira Ramanaviciene ◽  
Jaroslav Voronovic ◽  
Arunas Ramanavicius
Keyword(s):  
Gold Nanoparticles ◽  
Glucose Oxidase ◽  
Colloidal Gold ◽  
Glucose Biosensor ◽  
Graphite Electrodes ◽  
Colloidal Gold Nanoparticles

Modification of Glucose Oxides Sensors Using Colloidal Gold Nanoparticles

2012 ◽  
Vol 496 ◽  
pp. 17-20
Author(s):  
N. H. Fakhrabadi ◽  
A.A. Rohani ◽  
Afshin Farahbakhsh
Keyword(s):  
Gold Nanoparticles ◽  
Ionic Liquid ◽  
Glucose Oxidase ◽  
Colloidal Gold ◽  
Glucose Solution ◽  
Graphite Powder ◽  
Transfer Time ◽  
Electrode Structure ◽  
Colloidal Gold Nanoparticles ◽  
Paraffin Oil

Glucose oxidase sensor is one of the best methods for measuring small amounts of glucose; this sensor can be modified using colloidal gold nanoparticles as complementary substance in the electrode structure with the aim of increasing efficiency. In this article, the colloidal gold nanoparticles (24 nm) were used to construct the two electrodes. The first electrode (Au/CP) was constructed of 100 mg carbon graphite powder, 36 µl paraffin oil and 300 µl colloidal gold nanoparticles. The second electrode (Au/CILE) was constructed of 100 mg carbon graphite powder, 36 µl paraffin oil, 300 µl colloidal gold and 50 mg ionic liquid oppf6. To evaluate the performance of each electrode and to prepare of bio sensor, these were covered by solution of 10 mg glucose oxidase and 1 ml phosphate buffer. The bio sensors were test with 0.8 mM glucose solution. By comparing the amount of AMP and the transfer time for both, the according results, the effect of colloidal gold nanoparticles on the increasing conductivity, sensitivity and stability biosensor, was determined.

Dense aqueous colloidal gold nanoparticles prepared from highly concentrated precursor solution

2011 ◽  
Vol 362 (2) ◽  
pp. 325-329 ◽  
Author(s):  
Tetsuro Soejima ◽  
Seisaku Oshiro ◽  
Yasuji Nakatsuji ◽  
Seishiro Ito
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Gold ◽  
Precursor Solution ◽  
Colloidal Gold Nanoparticles

An enhanced ELISA based on modified colloidal gold nanoparticles for the detection of Pb(II)

2011 ◽  
Vol 26 (8) ◽  
pp. 3700-3704 ◽  
Author(s):  
Yu Zhou ◽  
Xiang-Li Tian ◽  
Yan-Song Li ◽  
Feng-Guang Pan ◽  
Yuan-Yuan Zhang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Gold ◽  
Colloidal Gold Nanoparticles

Effect of Voltage on Colloidal Gold (Au) Nanoparticles Produced Using Electro-Dissolution-Reduction Method

2015 ◽  
Vol 1115 ◽  
pp. 386-389
Author(s):  
Haroon Haiza ◽  
I.I. Yaacob ◽  
Ahmad Zahirani Ahmad Azhar
Keyword(s):  
Gold Nanoparticles ◽  
Electron Microscope ◽  
Colloidal Gold ◽  
Reduction Process ◽  
Chloride Ions ◽  
Complex Ions ◽  
Dc Power ◽  
Colloidal Gold Nanoparticles ◽  
Transmission Electron ◽  
The Mean

Colloidal gold nanoparticles have been successfully prepared using a simple two-electrode cells connected to a DC power supply. During the electro-dissolution-reduction process, the bulk gold at the anode oxidized into gold cations which then reacted with the chloride ions to form aurochloride complex. The complex ions were then reduced by the citrate ion to form colloidal gold nanoparticles. The size and shape of the nanoparticles were modulated by varying the terminal voltages. The colloidal gold nanoparticles obtained were characterized by field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM) and ultraviolet-visible spectrophotometer (UV-Vis). From FESEM analysis, it was found that by increasing the voltage, the size of colloidal gold nanoparticles produced marginally decreased. The mean sizes of gold nanoparticles were roughly about 23.5 nm, 23.2 nm and 19.3 nm for 32 V, 36 V and 40 V, respectively. TEM micrograph showed that the shape of gold nanoparticles obtained is almost spherical. The characteristic peaks of UV-Vis spectra revealed that the suspension was indeed colloidal gold nanoparticles. Keywords: Gold, Nanoparticles, Electro-dissolution-reduction

scholarly journals Back Cover: Unconventional Chain-Growth Mode in the Assembly of Colloidal Gold Nanoparticles (Angew. Chem. Int. Ed. 32/2012)

2012 ◽  
Vol 51 (32) ◽  
pp. 8122-8122 ◽  
Author(s):  
Hong Wang ◽  
Liyong Chen ◽  
Xiaoshuang Shen ◽  
Liangfang Zhu ◽  
Jiating He ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Gold ◽  
Growth Mode ◽  
Chain Growth ◽  
Back Cover ◽  
Colloidal Gold Nanoparticles
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