A second-order advantage achieved with the aid of gold nanoparticle catalytic activity. Determination of nitrophenol isomers in binary mixtures

2014 ◽  
Vol 6 (9) ◽  
pp. 3056-3064 ◽  
Author(s):  
Faride Rabbani ◽  
Hamid Abdollahi ◽  
M. Reza Hormozi-Nezhad
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Gold Nanoparticle ◽  
Binary Mixtures ◽  
Spectrophotometric Method ◽  
Second Order ◽  
Activity Determination

A novel, simple and rapid spectrophotometric method for the determination of nitrophenol (NP) isomer mixtures based on the catalytic activity of gold nanoparticles is described.

scholarly journals Adenosine Deaminase Isoenzymes in the Diagnosis and Monitoring of Rheumatoid Arthritis

2012 ◽  
Vol 31 (3) ◽  
pp. 217-221
Author(s):  
Milada Nalesnik ◽  
Jasminka Nikolić ◽  
Tatjana Bućma
Keyword(s):  
Rheumatoid Arthritis ◽  
Catalytic Activity ◽  
Adenosine Deaminase ◽  
Spectrophotometric Method ◽  
Biochemical Parameters ◽  
Biochemical Marker ◽  
Diagnostic Value ◽  
Activity Determination ◽  
Catalytic Activities

Adenosine Deaminase Isoenzymes in the Diagnosis and Monitoring of Rheumatoid ArthritisThe aim of this study was determination of the catalytic activities of adenosine deaminase (ADA), ADA1 and ADA2 isoenzymes in the serum of patients suffering from rheumatoid arthritis (RA) who were and were not treated with methotrexate (MTX), and identification of the possibilities of using these biochemical parameters in diagnosing and monitoring the treatment effects in RA. Catalytic activities of total ADA (tADA) and ADA2 in serum were determined by a spectrophotometric method. A statistically significant correlation was found between the total ADA and ADA1 values, as well as between tADA and ADA2 in the serum of all patients suffering from RA. Determination of ADA1 and ADA2 isoenzyme catalytic activities in the serum of patients who might be suffering from RA improves the diagnostic value of total ADA catalytic activity determination. ADA2 catalytic activity in serum can be a useful biochemical marker in diagnosing and monitoring RA. Decrease in ADA1 isoenzyme catalytic activities in the serum of patients suffering from RA who were treated with MTX can help in the observation of MTX therapy effects.

β-Cyclodextrin protected gold nanoparticle based cotton swabs as an effective candidate for specific sensing of trace levels of cyanide

2019 ◽  
Vol 11 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Ramar Rajamanikandan ◽  
Malaichamy Ilanchelian
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Water Based

In this paper, a rapid colorimetric and easy visual determination of cyanide ions (CN− ions) in water, based on gold nanoparticles (AuNPs) stabilized with β-cyclodextrin (β-CD), is described.

Electrochemical determination of trace copper(ii) based onl-cysteine functionalized gold nanoparticle/CdS nanosphere hybrid

2016 ◽  
Vol 8 (17) ◽  
pp. 3592-3598 ◽  
Author(s):  
Lin-Gang Li ◽  
Meng Chen ◽  
He-Qun Hao ◽  
Qing-Qing Xu ◽  
Ju Wu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Determination ◽  
Carbon Electrode ◽  
Electrochemical Assay ◽  
Functionalized Gold Nanoparticles ◽  
Sensing Platform

This paper describes a simple and efficient electrochemical assay for the determination of trace Cu(ii) employingl-cysteine functionalized gold nanoparticles/CdS nanospheres/glassy carbon electrode (l-cys/AuNPs/CdS/GCE) as an enhanced sensing platform.

Enhanced electrochemical sensing of dopamine in the presence of AA and UA using a curcumin functionalized gold nanoparticle modified electrode

2019 ◽  
Vol 43 (48) ◽  
pp. 19003-19013 ◽  
Author(s):  
K. Krishna Kumar ◽  
M. Devendiran ◽  
R. A. Kalaivani ◽  
S. Sriman Narayanan
Keyword(s):  
Gold Nanoparticles ◽  
Electrochemical Sensor ◽  
Gold Nanoparticle ◽  
Modified Electrode ◽  
Electrochemical Sensing

In the present study, a electrochemical sensor for the determination of dopamine was developed with green synthesised gold nanoparticles using curcumin as a reducing and, functionalizing agent.

Simultaneous determination of binary mixtures of trimethoprim and sulfamethoxazole or sulphamethoxypyridazine by the bivariate calibration spectrophotometric method

2002 ◽  
Vol 30 (1) ◽  
pp. 77-85 ◽  
Author(s):  
Leticia López-Martı́nez ◽  
Pedro Luis López-de-Alba ◽  
Luis Manuel de-León-Rodrı́guez ◽  
Ma.Lourdes Yepez-Murrieta
Keyword(s):  
Simultaneous Determination ◽  
Binary Mixtures ◽  
Spectrophotometric Method

scholarly journals Disposable gold nanoparticle functionalized and bare screen-printed electrodes for potentiometric determination of trazodone hydrochloride in pure form and pharmaceutical preparations

RSC Advances ◽  
2018 ◽  
Vol 8 (21) ◽  
pp. 11517-11527 ◽  
Author(s):  
Fathy M. Salama ◽  
Khalid A. Attia ◽  
Ragab A. Said ◽  
Ahmed El-Olemy ◽  
Ahmed M. Abdel-raoof
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Electrochemical Sensors ◽  
Pharmaceutical Preparations ◽  
Potentiometric Determination ◽  
Chemically Modified ◽  
Screen Printed Electrodes ◽  
Trazodone Hydrochloride ◽  
Screen Printed

In the present study, screen-printed electrodes unmodified and chemically modified with gold nanoparticles were used as sensitive electrochemical sensors for the determination of trazodone hydrochloride.

Selective Colorimetric Sensing of Deferoxamine with 4-Mercaptophenol− and Mercaptoacetic acid−Functionalized Gold Nanoparticles via Fe(III)-Chelation

2021 ◽  
Author(s):  
Ömer Kaan Koç ◽  
Elif Ezgi Benli ◽  
Nurşah Karahan ◽  
Ayşem Üzer Arda ◽  
Resat Apak
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Au Nanoparticles ◽  
Mercaptoacetic Acid ◽  
Colorimetric Sensing ◽  
Colorimetric Probe ◽  
Functionalized Gold Nanoparticles

A gold nanoparticle-based colorimetric probe was developed for the determination of deferoxamine (desferrioxamine, DFO), a strong Fe(III) ion-chelator. Au-nanoparticles were synthesized and modified with 4-mercaptophenol (4MP) and mercaptoacetic acid (MAA)...

scholarly journals Spectrophotometric method for simultaneous determination of valsartan and substances from the group of statins in binary mixtures

2017 ◽  
Vol 67 (4) ◽  
pp. 463-478 ◽  
Author(s):  
Mariusz Stolarczyk ◽  
Anna Apola ◽  
Anna Maślanka ◽  
Anna Kwiecień ◽  
Włodzimierz Opoka
Keyword(s):  
Simultaneous Determination ◽  
Binary Mixtures ◽  
Spectrophotometric Method ◽  
Pharmaceutical Preparations ◽  
High Sensitivity ◽  
Derivative Spectrophotometry

Abstract Applicability of derivative spectrophotometry for the determination of valsartan in the presence of a substance from the group of statins was checked. The obtained results indicate that the proposed method may be effective by using appropriate derivatives: for valsartan and fluvastatin - D1, D2 and D3, for valsartan and pravastatin - D1 and D3, for valsartan and atorvastatin - D2 and D3. The method was characterized by high sensitivity and accuracy. Linearity was maintained in the following ranges: 9.28-32.48 mg mL-1 for valsartan, 8.16-28.56 mg mL-1 f or fluvastatin, 14.40-39.90 mg mL-1 for atorvastatin and 9.60-48.00 mg mL-1 for pravastatin. Determination coefficients were in the range of 0.989-0.999 depending on the analyte and the order of derivative. The precision of the method was high with RSD from 0.1 to 2.5 % and recovery of individual components was within the range of 100 ± 5 %. The developed method was successfully applied to the determination of valsartan combined with fluvastatin, atorvastatin and pravastatin in laboratory prepared mixtures and in pharmaceutical preparations.

scholarly journals A thio-β-cyclodextrin functionalized graphene/gold nanoparticle electrochemical sensor: a study of the size effect of the gold nanoparticles and the determination of tetrabromobisphenol A

RSC Advances ◽  
2019 ◽  
Vol 9 (31) ◽  
pp. 17897-17904
Author(s):  
Suxing Luo ◽  
Yuanhui Wu ◽  
Qingsong Mou ◽  
Jinhai Li ◽  
Xiaoxue Luo
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Size Effect ◽  
Gold Nanoparticle ◽  
Glassy Carbon ◽  
Tetrabromobisphenol A ◽  
Carbon Electrode ◽  
Functionalized Graphene ◽  
Modified Glassy Carbon Electrode

In this study, a novel tetrabromobisphenol A (TBBPA) sensor was fabricated based on a CTAB-capped gold nanoparticle (AuNP)-thio-β-cyclodextrin (SH-β-CD)/graphene oxide modified glassy carbon electrode (GCE).

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