a cysteine sensor based on a gold nanoparticle iron

Cysteine

The cysteine-stimulated aggregation of Au nanoparticles (Au NPs) is used as an auxiliary reporting system for the optical detection of H 2 O 2, for optical probing of the glucose oxidase (GOx) and the catalyzed oxidation of glucose, for probing the biocatalytic cascade composed of acetylcholine esterase/choline oxidase (AChE/ChOx), and for following the inhibition of AChE.

University of Dundee Multi

{PAGE } Multi-shaped cationic gold nanoparticle-L-cysteine-ZnSeS quantum dots hybrid nanozyme as an intrinsic peroxidase mimic for the rapid colorimetric detection of cocaine Oluwasesan Adegokea,*, Craig McKenzieb, Niamh Nic Daeida,b aLeverhulme Research Centre for Forensic Science, University of Dundee, Dundee, DD1 4GH

Development of nanoparticle

2017/3/31Background Pathogenic bacteria contribute to various globally important diseases, killing millions of people each year. Various fields of medicine currently benefit from or may potentially benefit from the use of nanotechnology applications, in which there is growing interest. Disease-related biomarkers can be rapidly and directly detected by nanostructures, such as nanowires, nanotubes

Mechanisms of Aggregation of Cysteine Functionalized

The interaction of gold nanoparticles (AuNPs) with cysteine and its derivatives is the basis of a number of bionanotechnologies, and for these, the most important process is aggregation (or antiaggregation), which enables an array of colorimetric detection methods. When AuNPs were functionalized with cysteine, its dimer cystine, or the cysteine-derived tripeptide, glutathione, three different

A cysteine sensor based on a gold nanoparticle–iron

An electrochemical sensor for the sensitive and selective detection of cysteine is proposed based on a gold nanoparticle (AuNP)–iron(III) phthalocyanine (FePc) modified graphite paste electrode. The sensor was characterised using scanning electron microscopy (SEM/EDX), transmission electron microscopy (TEM), cyclic voltammetry and electrochemical impedance spectroscopy (EIS).

Nanomaterial enabled sensors for environmental

2018/11/22Nanomaterial enabled sensors are an exciting technology that provide exquisite detection, on the nanomolar to sub-picomolar level, of environmental contaminants [1,2,3,4,5].Interest in these sensors stems from their potential for facile, in-field contaminant detection

Gold Nanoparticles: Properties and Applications

Sensors - Gold nanoparticles are used in a variety of sensors. For example, a colorimetric sensor based on gold nanoparticles can identify if foods are suitable for consumption. 4 Other methods, such as surface enhanced Raman spectroscopy, exploit gold nanoparticles as substrates to enable the measurement of vibrational energies of chemical bonds.

Review—Chemical and Biological Sensors for Viral

2019/12/19Lee et al. developed an electrical resistance biosensor based on multi functionalized-CNTs for detection of influenza A and norovirus target DNA. 71 First, gold/magnetic iron-oxide nanoparticle (MNP)-decorated CNTs (Au/MNP-CNT) were synthesized and

Ferritin as a photocatalyst and scaffold for gold

Ferritin as a photocatalyst and scaffold for gold nanoparticle synthesis Ferritin as a photocatalyst and scaffold for gold nanoparticle synthesis Keyes, Jeremiah; Hilton, Robert; Farrer, Jeffrey; Watt, Richard 2010-11-21 00:00:00 The ferrihydrite mineral core of ferritin is a semi-conductor capable of catalyzing oxidation/reduction reactions.

Electrochemical DNA sensors based on the use of gold

2017/3/6Electrochemical DNA sensors represent a simple, accurate and economical platform for DNA detection. Gold nanoparticles are known to be efficient labels in electrochemical sensors and to be viable materials to modify the surface of electrodes thereby to enhance the detection limit of the sensor. For surface modification, gold nanoparticles are used in combination with nanomaterials like

Frontiers

Among such nanomaterials, gold nanoparticles, semi-conductor quantum dots, polymer nanoparticles, carbon nanotubes, nanodiamonds, and graphene are intensively studied. Due to the vast evolution of this research field, this review summarizes in a non-exhaustive way the advantages of nanomaterials by focusing on nano-objects which provide further beneficial properties than "just" an

Cysteine

The cysteine-stimulated aggregation of Au nanoparticles (Au NPs) is used as an auxiliary reporting system for the optical detection of H 2 O 2, for optical probing of the glucose oxidase (GOx) and the catalyzed oxidation of glucose, for probing the biocatalytic cascade composed of acetylcholine esterase/choline oxidase (AChE/ChOx), and for following the inhibition of AChE.

Cysteine Interactions in Glutathione Mediated Assembly of

We Report Herein Results of an Investigation of the Assembly of Silver Nanoparticles Mediated by Glutathione (GSH) and Cysteine (Cys) Interaction in the Presence of Metal Ions: Ag+, Cd2+, Co2+, Cu2+, Fe3+, Hg2+, Ni2+, Pb2+, Zn2+. The Silver Nanoparticles

Gold

A sensor based on gold nanoparticle on the surface of L-cysteine modified gold electrode is prepared. Electrochemical behavior of dopamine hydrochloride is investigated. The linear relation between peak current of dopamine hydrochloride and scan speed in the range of 10 to 1000 mV s−1 indicates that a diffusion-adsorption controls the process. The linearity range is 1.05 10−5–7.38

Defense Applications for Nanomaterials and Nanoparticles

Gold nanoparticles have been investigated for use in sensors for both chemical and biological warfare agents. In one example, 'chemi-resistors' comprised of thin films of nanogold particles encapsulated in monomolecular layers of fictionalized alkanethiols deposited

A conjugated gold nanoparticle

A conjugated gold nanoparticle-azacyanine off-on-off fluorescence probe for sensitive and selective detection of G-quadruplexes Highlights•A novel fluorescence probe for sensitive, selective sensing of G4 DNA was developed.•This is the first conjugated AuNPs-small molecule probe for the detection of G4s.•This off-on-off probe is governed by FRET mechanism between the Aza5 and AuNPs

Fluorescent probes for detecting cysteine

2018/8/6Huang S, Wang L, Huang C, Hu B, Su W and Xiao Q 2016 Graphene quantum dot coupled with gold nanoparticle based 'off-on' fluorescent probe for sensitive and selective detection of L-cysteine Microchim. Acta. 183 1855–64 Crossref Google Scholar

Electrochemical DNA sensors based on the use of gold

2017/3/6Electrochemical DNA sensors represent a simple, accurate and economical platform for DNA detection. Gold nanoparticles are known to be efficient labels in electrochemical sensors and to be viable materials to modify the surface of electrodes thereby to enhance the detection limit of the sensor. For surface modification, gold nanoparticles are used in combination with nanomaterials like

Colloidal gold

Colloidal gold is a sol or colloidal suspension of nanoparticles of gold in a fluid, usually water. The colloid is usually either an intense red colour (for spherical particles less than 100 nm) or blue/purple (for larger spherical particles or nanorods). Due to their optical, electronic, and molecular-recognition properties, gold nanoparticles are the subject of substantial research, with

Gold

A sensor based on gold nanoparticle on the surface of L-cysteine modified gold electrode is prepared. Electrochemical behavior of dopamine hydrochloride is investigated. The linear relation between peak current of dopamine hydrochloride and scan speed in the range of 10 to 1000 mV s−1 indicates that a diffusion-adsorption controls the process. The linearity range is 1.05 10−5–7.38

Nanomaterials

Iron oxide and gold-based magneto-plasmonic nanostructures exhibit remarkable optical and superparamagnetic properties originating from their two different components. As a consequence, they have improved and broadened the application potential of nanomaterials in medicine. They can be used as multifunctional nanoprobes for magneto-plasmonic heating as well as for magnetic and optical

Cysteine Interactions in Glutathione Mediated Assembly of

We Report Herein Results of an Investigation of the Assembly of Silver Nanoparticles Mediated by Glutathione (GSH) and Cysteine (Cys) Interaction in the Presence of Metal Ions: Ag+, Cd2+, Co2+, Cu2+, Fe3+, Hg2+, Ni2+, Pb2+, Zn2+. The Silver Nanoparticles

Electrochemical Sensing: ChemElectroChem

2019/7/17The Cover Feature illustrates the nanocomposite material FeOcPc−Ni/GO made of stacked graphene oxide sheets covered with carboxylated iron phthalocyanine molecules connected through ultra‐small nickel hydroxide nanoparticles, providing a very effective electrocatalyst for glucose sensing based on its oxidation to gluconic acid in aqueous media.

Functional Nanomaterials and Applications Lab

Graphene Oxide–Upconversion Nanoparticle Based Portable Sensors for Assessing Nutritional Deficiencies in Crops. ACS Nano, 2018, 12 (6), pp 6273–6279 DOI: 10.1021/acsnano.8b03261 Multiplexed mRNA Sensing and Combinatorial-Targeted Drug Delivery Using DNA-Gold Nanoparticle

Defense Applications for Nanomaterials and Nanoparticles

Gold nanoparticles have been investigated for use in sensors for both chemical and biological warfare agents. In one example, 'chemi-resistors' comprised of thin films of nanogold particles encapsulated in monomolecular layers of fictionalized alkanethiols deposited

Cysteine Interactions in Glutathione Mediated Assembly of

We Report Herein Results of an Investigation of the Assembly of Silver Nanoparticles Mediated by Glutathione (GSH) and Cysteine (Cys) Interaction in the Presence of Metal Ions: Ag+, Cd2+, Co2+, Cu2+, Fe3+, Hg2+, Ni2+, Pb2+, Zn2+. The Silver Nanoparticles

Electrochemical biosensors: perspective on functional

2020/2/4Background The electrochemical biosensor is one of the typical sensing devices based on transducing the biochemical events to electrical signals. In this type of sensor, an electrode is a key component that is employed as a solid support for immobilization of biomolecules and electron movement. Thanks to numerous nanomaterials that possess the large surface area, synergic effects

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