Au–Hg/rGO with enhanced peroxidase-like activity for sensitive colorimetric determination of H2O2

The Analyst ◽  
2020 ◽  
Vol 145 (6) ◽  
pp. 2191-2196
Author(s):  
Fen-Ying Kong ◽  
Lei Yao ◽  
Xin-Yang Lu ◽  
Heng-Ye Li ◽  
Zhong-Xia Wang ◽  
...  
Keyword(s):  
Colorimetric Determination ◽  
Sensing Platform

Au–Hg/rGO is applied as a novel nanozyme to construct a sensitive sensing platform for the colorimetric determination of H2O2.

Use of the peroxidase mimetic activity of erythrocyte-like Cu1.8S nanoparticles in the colorimetric determination of glutathione

2017 ◽  
Vol 9 (5) ◽  
pp. 841-846 ◽  
Author(s):  
Hongyan Zou ◽  
Tong Yang ◽  
Jing Lan ◽  
Chengzhi Huang
Keyword(s):  
Fenton Reaction ◽  
Catalytic Process ◽  
Colorimetric Determination ◽  
Peroxidase Mimetic ◽  
Sensing Platform ◽  
Tetramethyl Benzidine

Erythrocyte-like Cu1.8S nanoparticles exhibited excellent peroxidase mimetic properties and were able to catalyse tetramethyl benzidine (TMB) to its blue oxidized product in the presence of H2O2 following the Fenton reaction. The catalytic process was inhibited by glutathione (GSH) and this phenomenon was used to construct an efficient sensing platform for the colorimetric determination of glutathione.

scholarly journals MoS2 nanosheet mediated ZnO–g-C3N4 nanocomposite as a peroxidase mimic: catalytic activity and application in the colorimetric determination of Hg(ii)

RSC Advances ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 4268-4276 ◽  
Author(s):  
A. Anand Babu Christus ◽  
P. Panneerselvam ◽  
A. Ravikumar ◽  
M. Marieeswaran ◽  
S. Sivanesan
Keyword(s):  
Catalytic Activity ◽  
Metal Ions ◽  
Colorimetric Determination ◽  
Colorimetric Sensing ◽  
Peroxidase Mimic ◽  
Sensing Platform ◽  
Mos2 Nanosheet

A novel colorimetric sensing platform using the peroxidase mimicking activity of ternary MoS2-loaded ZnO–g-C3N4 nanocomposites (ZnO–g-C3N4/MoS2) has been developed for the determination of Hg(ii) ions over co-existing metal ions.

scholarly journals Optical Sensing Platform for the Colorimetric Determination of Silver Nanoprisms and Its Application for Hydrogen Peroxide and Glucose Detections Using a Mobile Device Camera

2019 ◽  
Vol 35 (3) ◽  
pp. 271-276 ◽  
Author(s):  
Chutiparn LERTVACHIRAPAIBOON ◽  
Takuya MARUYAMA ◽  
Akira BABA ◽  
Sanong EKGASIT ◽  
Kazunari SHINBO ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Mobile Device ◽  
Optical Sensing ◽  
Colorimetric Determination ◽  
Silver Nanoprisms ◽  
Sensing Platform

A Method for the Colorimetric Determination of β-Glucuronidase in Urine, Serum, Tissue; Assay of Enzymatic Activity in Health and Disease

1959 ◽  
Vol 36 (2) ◽  
pp. 193-201 ◽  
Author(s):  
Julius A. Goldbarg ◽  
Esteban P. Pineda ◽  
Benjamin M. Banks ◽  
Alexander M. Rutenburg
Keyword(s):  
Enzymatic Activity ◽  
Colorimetric Determination ◽  
Health And Disease ◽  
Urine Serum

Colorimetric Determination of Fluoride in Drinking Groundwater using a Polymeric Zirconium Complex of 5-(2-Carboxyphenylazo)-8-Hydroxyquinoline

2013 ◽  
Vol 12 (7) ◽  
pp. 460-465
Author(s):  
Sameer Amereih ◽  
Zaher Barghouthi ◽  
Lamees Majjiad
Keyword(s):  
Drinking Water ◽  
Detection Limit ◽  
Complex Formation ◽  
Molar Absorptivity ◽  
Colorimetric Determination ◽  
Zirconium Complex ◽  
Reliable Determination ◽  
Percentage Recovery ◽  
Quantitation Limit

A sensitive colorimetric determination of fluoride in drinking water has been developed using a polymeric zirconium complex of 5-(2-Carboxyphenylazo)-8-Hydroxyquinoline as fluoride reagents. The method allowed a reliable determination of fluoride in range of (0.0-1.5) mg L-1. The molar absorptivity of the complex formation is 7695 ± 27 L mol-1 cm-1 at 460 nm. The sensitivity, detection limit, quantitation limit, and percentage recovery for 1.0 mg L-1 fluoride for the proposed method were found to be 0.353 ± 0.013 μg mL-1, 0.1 mg L-1, 0.3 mg L-1, and 101.7 ± 4.1, respectively.

Colorimetric Determination of Amoxicillin in Pure and some Pharmaceutical Formulations Via Reaction with Potassium Permanganate as Oxidant Reagent

2019 ◽  
Vol 10 (02) ◽  
Author(s):  
Abbas Shebeeb Al-kadumi ◽  
Sahar Rihan Fadhel ◽  
Mohammed Abdullah Ahmed ◽  
Luma Amer Musa
Keyword(s):  
Potassium Permanganate ◽  
Pharmaceutical Preparations ◽  
Pharmaceutical Formulations ◽  
Atomic Emission ◽  
Basic Medium ◽  
Photometric Method ◽  
Colorimetric Determination ◽  
Spectrophotometric Methods ◽  
Label Claim

We proposed two simple, rapid, and convenient spectrophotometric methods are described for the determination of Amoxicillin in bulk and its pharmaceutical preparations. They are based on the measurement of the flame atomic emission of potassium ion (in first method) and colorimetric determination of the green colored solution for manganite ion at 610 nm formed after reaction of Amoxicillin with potassium permanganate as oxidant agent (in the second method) in basic medium. The working conditions of the methods were investigated and optimized. Beer's law plot showed a good correlation in the concentration range of 5-45 μg/ml. The detection limits and relative standared deviations were (2.573, 2.814 μg/ml) (2.137, 2.498) for the flame emission photometric method and (1.844, 2.016 μg/ml) (1.645,1.932) for colorimetric methods for capsules and suspensions respectively. The methods were successfully applied to the determination of Amoxicillin in capsules and suspensions, and the obtained results were in good agreement with the label claim. No interference was observed from the commonly encountered additives and expectancies.

Selective Sensing Platform Utilizing Graphitized Multi-Walled Carbon Nanotubes for Monitoring of Ondansetron and Paracetamol

2020 ◽  
Vol 16 ◽  
Author(s):  
Biljana Nigović ◽  
Iva Šimunić ◽  
Ana Mornar
Keyword(s):  
Carbon Nanotubes ◽  
Cation Exchange ◽  
Supporting Electrolyte ◽  
Polymer Concentration ◽  
Fixed Dose ◽  
Sensing Platform ◽  
Multi Walled Carbon Nanotubes ◽  
Electroanalytical Method ◽  
Walled Carbon Nanotubes

Background: Ondansetron and paracetamol are often co-administrated to prevent and treat nausea and vomiting caused by anaesthesia and to control of postoperative pain. In addition, ondansetron is used as the first-line antiemetic in paracetamol overdose. Therefore, selective and sensitive method for their simultaneous analysis is of a great importance. The electroanalytical methods are highly sensitive and offer many possibilities for new sensor platform design. However, at present, no electroanalytical method for simultaneous determination of these drugs has been proposed. Objective: The aim of this study was to develop a novel nanosensor for selective monitoring of ondansetron and paracetamol in pharmaceutical and biological samples without expensive and time-consuming pretreatments. Methods: The graphitized multi-walled carbon nanotubes embedded in a cation exchange polymer matrix was selected, among various surface functionalizations evaluated, to design novel sensor. Based on its excellent sensing performance, the first electroanalytical method was developed for rapid concurrent determination of investigated drugs. Results: The scanning electron microscopy study showed interlinked nanoporous network structure and highly enlarged active surface. The developed sensor facilitated electron transfer in the oxidation of both drugs and tremendously enhanced the adsorption capacity for ondasetron, thus exhibiting significant increase of drug responses and sensitivity. To obtain much sensitive response of investigated drugs the effect of pH values of supporting electrolyte, dispersed nanomaterial amount, the cation exchange polymer concentration, drop-casting volume of nanocomposite suspension, accumulation potential and deposition time on the peak current was evaluated. The developed electroanalytical method was validated and practical utility of the proposed nanosensor was tested. Conclusion: The developed sensor is promising sensing platform with a fast response time for analysis of ondansetron and paracetamol at very different concentration levels found in their fixed-dose combination and human serum sample after recommended daily doses showing its potential usage in pharmaceutical quality control and clinical research.

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