Search results for: Akhtar Hayat

Items from 1 to 20 out of 54 results

article

Covalent organic frameworks (COFs) as carrier for improved drug delivery and biosensing applications

Rida Younas, Farhat Jubeen, Nargis Bano, Silvana Andreescu, more

Biotechnology and Bioengineering > 121 > 7 > 2017 - 2049

Porous organic frameworks (POFs) represent a significant subclass of nanoporous materials in the field of materials science, offering exceptional characteristics for advanced applications. Covalent organic frameworks (COFs), as a novel and intriguing type of porous material, have garnered considerable attention due to their unique design capabilities, diverse nature, and wide‐ranging applications...

article

Orange Peel Derived C‐dots Decorated CuO Nanorods for the Selective Monitoring of Dopamine from Deboned Chicken

Muhammad Asad, Anam Zulfiqar, Rizwan Raza, Minghui Yang, more

Electroanalysis > 32 > 1 > 11 - 18

A novel electrode based on orange peel derived C‐dots decorated CuO nanorods (CR@C‐dot) modified lead pencil (LP) electrode has been fabricated for highly sensitive and selective monitoring of dopamine (DA). Prior to the functionalization with C‐dot, electrochemical efficacy of CR was evaluated and compared with CuO nano‐needles (CN) and nano‐spheres (CS). The morphology, surface area and composition...

article

Polymer scaffold layers of screen-printed electrodes for homogeneous deposition of silver nanoparticles: application to the amperometric detection of hydrogen peroxide

K . Yugender Goud, V. Sunil Kumar, Akhtar Hayat, Gaelle Catanante, more

Microchimica Acta > 2019 > 186 > 12 > 1-10

A method is described for electrochemical oxidation of polymers on the surface of screen-printed electrodes (SPCE). These act as scaffold layers for homogeneous deposition of silver nanoparticles (AgNPs). Hexamethylenediamine (HMDA) and poly(ethylene glycol) were immobilized on the SPCE surface via electrochemical oxidation. AgNPs were then electrodeposited on the scaffolds on the SPCE. This type...

article

A nanocomposite prepared from magnetite nanoparticles, polyaniline and carboxy-modified graphene oxide for non-enzymatic sensing of glucose

Razia Batool, Muhammad Asim Akhtar, Akhtar Hayat, Dongxue Han, more

Microchimica Acta > 2019 > 186 > 5 > 1-10

The authors report on the synthesis of carboxy functionalized graphene oxide (fGO) decorated with magnetite (Fe₃O₄) nanoparticles. The resulting nanomaterial was used to prepare a composite with polyaniline (PANI) which was characterized by UV-vis, Fourier transform-infrared and Raman spectroscopies. Its surface morphologies were characterized by atomic force and scanning electron microscopies. A...

article

Development of a disposable electrochemical sensor for detection of cholesterol using differential pulse voltammetry

Muhammad Azhar Hayat Nawaz, Marjan Majdinasab, Usman Latif, Muhammad Nasir, more

Journal of Pharmaceutical and Biomedical Analysis > 2018 > 159 > C > 398-405

In this study, a sensitive and selective electrochemical sensor was fabricated by using a screen printed carbon electrode (SPCE), multi-walled carbon nanotubes (MWCNTs) and β-cyclodextrin (β-CD) for detecting cholesterol. MWCNTs were functionalized with benzoic acid moiety by employing diazonium salt chemistry, and, subsequently, a thin film of functionalized CNTs were coated on the surface of SPCE...

article

Ionic liquid coated iron nanoparticles are promising peroxidase mimics for optical determination of H₂O₂

Faiza Zarif, Sajid Rauf, Muhammad Zahid Qureshi, Noor Samad Shah, more

Microchimica Acta > 2018 > 185 > 6 > 1-9

Ionic liquid coated nanoparticles (IL-NPs) consisting of zero-valent iron are shown to display intrinsic peroxidase-like activity with enhanced potential to catalyze the oxidation of the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide. This results in the formation of a blue green colored product that can be detected with bare eyes and quantified by...

article

Advantages of Carbon Nanomaterials in Electrochemical Aptasensors for Food Analysis

Alina Vasilescu, Akhtar Hayat, Szilveszter Gáspár, Jean‐Louis Marty

Electroanalysis > 30 > 1 > 2 - 19

Electrochemical aptasensors appear as promising tools in food analysis, able to provide sensitive, fast and cost‐effective analysis, with the added advantage of portability. Carbon nanomaterials and in particular carbon nanotubes and graphene are among the nanomaterials most often used to build electrochemical aptasensors due to their good electrical conductivity, large surface area and multiple functionalisation...

article

Photoinduced discharge of electrons stored in a TiO2-MWCNT composite to an analyte: application to the fluorometric determination of hydrogen peroxide, glucose and aflatoxin B1

Amina Rhouati, Muhammad Nasir, Jean-Louis Marty, Akhtar Hayat

Microchimica Acta > 2018 > 185 > 1 > 1-9

The authors describe an analytical detection scheme based on the use of multiwalled carbon nanotubes (MWCNTs) that accept and store electrons upon contact with photo-irradiated TiO₂ nanoparticles (TiO₂-NPs). The Fermi level equilibration with photo-irradiated TiO₂-NPs has a storage value of 0.35 mM of electrons per 120 mg·L⁻¹ of MWCNTs. The stored electrons can be discharged on demand upon addition...

article

Biomimetic nitrogen doped titania nanoparticles as a colorimetric platform for hydrogen peroxide detection

Muhammad Nasir, Sajid Rauf, Nawshad Muhammad, Mian Hasnain Nawaz, more

Journal of Colloid and Interface Science > 2017 > 505 > C > 1147-1157

Nanoparticles proved a viable alternative to the already used sensing and diagnostics methods due to their low cost, good stability, easy availability and easy synthesis. In the present approach, nitrogen doped titania nanoparticles are prepared through freeze drying method, and subsequently stabilized through ionic liquid. These nanoparticles were characterized through various techniques such as...

article

Functionalized graphene oxide–polypyrrole–chitosan (fGO–PPy–CS) modified screen-printed electrodes for non-enzymatic hydrogen peroxide detection

Muhammad Asim Akhtar, Akhtar Hayat, Naseer Iqbal, Jean Louis Marty, more

Journal of Nanoparticle Research > 2017 > 19 > 10 > 1-11

Functionalized graphene oxide (fGO) was synthesized and subsequently used for synthesis of nanocomposite with polypyrrole (PPy) and chitosan (CS) to give fGO–PPy–CS nanocomposites. Screen-printed carbon electrodes were then modified with these nanocomposites to construct an unprecedented hydrogen peroxide (H₂O₂) sensor. Cyclic voltammetry (CV) and amperometric response demonstrated that the composite...

article

Protic ionic liquids as a versatile modulator and stabilizer in regulating artificial peroxidase activity of carbon materials for glucose colorimetric sensing

Sajid Rauf, Muhammad Azhar Hayat Nawaz, Nawshad Muhammad, Rizwan Raza, more

Journal of Molecular Liquids > 2017 > 243 > C > 333-340

Herein, by utilizing ionic liquid, we have shown for the first time that activated carbon can be used as a cheap and recyclable peroxidase mimic in the construction of colorimetric sensors for biomedical applications. The purposed nanozyme catalyzed the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H₂O₂) to produce a blue colored product which can be monitored...

article

Aptamer-based zearalenone assay based on the use of a fluorescein label and a functional graphene oxide as a quencher

K. Yugender Goud, Akhtar Hayat, M. Satyanarayana, V. Sunil Kumar, more

Microchimica Acta > 2017 > 184 > 11 > 4401-4408

A versatile and cost-effective aptamer-based fluorescence quenching assay is described for the detection of the mycotoxin zearalenone (ZEN). Exfoliated functional graphene oxide (FGO) of high water-dispersibility is adopted as an effective fluorescence quencher of the fluorescence of FAM. Quenching properties of graphite, graphene oxide (GO) and FGO were investigated, and FGO is found to be the most...

article

An electrochemical aptasensor based on functionalized graphene oxide assisted electrocatalytic signal amplification of methylene blue for aflatoxin B1 detection

K. Yugender Goud, Akhtar Hayat, Gaëlle Catanante, Satyanarayana M., more

Electrochimica Acta > 2017 > 244 > C > 96-103

In this work, we developed an electrochemical aptasensor by using methylene blue (MB) redox probe labeled aptamer as a signaling fragment and functional graphene oxide (FGO) as the signal-enlarging platform. The role of functionalized graphene oxide was not mere to serve as a covalent immobilization support for aptamer sequences, but its catalytic signal amplification behavior towards methylene blue...

article

Electrospinning of graphene-oxide onto screen printed electrodes for heavy metal biosensor

Rupesh K. Mishra, Mian Hasnain Nawaz, Akhtar Hayat, Muhammad Azhar Hayat Nawaz, more

Sensors and Actuators B: Chemical > 2017 > 247 > C > 366-373

We present an electrospinning of graphene-oxide (GO) onto screen printed carbon electrodes (SPCE) for heavy metals (HMs) bio-sensing. The GO was dispersed in poly (vinyl alcohol) (PVA) diluted aqueous solution, and the mixture was electrospun into GO/PVA composite nanofibers. The morphology of GO and SPCE modified with electrospun nanofiber was studied using SEM micrographs and confirmed the uniform...

article

Disposable and portable aptamer functionalized impedimetric sensor for detection of kanamycin residue in milk sample

Atul Sharma, Georges Istamboulie, Akhtar Hayat, Gaëlle Catanante, more

Sensors and Actuators B: Chemical > 2017 > 245 > C > 507-515

With the increasing incidence and prevalence of antibiotic contamination in animal-derived food and drug resistance around the world, early and specific detection of antibiotic residues has garnered significant attention. Herein, for the first time, we devise a facile, label free and portable aptasensor for quantitative determination of Kanamycin (KANA) by electrochemical impedance spectroscopy (EIS),...

article

A novel colorimetric competitive aptamer assay for lysozyme detection based on superparamagnetic nanobeads

Rupesh K. Mishra, Akhtar Hayat, Geetesh K. Mishra, Gaëlle Catanante, more

Talanta > 2017 > 165 > C > 436-441

Lysozyme (Lys) commonly presents in wines and are known to cause toxicological impact on human health. The need of highly sensitive and reliable detection methods are evident in such matrix. In this work, we developed a competitive aptamer based assay for detection of Lys by employing carboxylated magnetic beads as a support to immobilize the target molecule Lys. The used aptamer sequence was biotinylated...

article

Biomolecular detection at ssDNA-conjugated nanoparticles by nano-impact electrochemistry

Anahita Karimi, Akhtar Hayat, Silvana Andreescu

Biosensors and Bioelectronics > 2017 > 87 > C > 501-507

We describe the use of ssDNA functionalized silver nanoparticle (AgNP) probes for quantitative investigation of biorecognition and real time detection of biomolecular targets using nano-impact electrochemistry. The method is based on measurements of the individual collision events between ssDNA aptamer-functionalized AgNPs and a carbon fiber miroelectrode (CFME). Specific binding events of target...

article

New biorecognition molecules in biosensors for the detection of toxins

Ingrid Bazin, Scherrine A. Tria, Akhtar Hayat, Jean-Louis Marty

Biosensors and Bioelectronics > 2017 > 87 > C > 285-298

Biological and synthetic recognition elements are at the heart of the majority of modern bioreceptor assays. Traditionally, enzymes and antibodies have been integrated in the biosensor designs as a popular choice for the detection of toxin molecules. But since 1970s, alternative biological and synthetic binders have been emerged as a promising alternative to conventional biorecognition elements in...

article

Poly (ethylene oxide) tethered trans-porphyrin: Synthesis, self-assembly with fullerene (C60) and DNA binding studies

Muhammad Asim Akhtar, Sara Riaz, Akhtar Hayat, Muhammad Nasir, more

Journal of Molecular Liquids > 2017 > 225 > C > 235-239

trans-Porphyrin containing phenyl group at both ends was synthesized via corresponding dipyrromethanes (DPM) in the presence of TFA and DDQ. The polyethyleneglycole (PEG) chains were attached at the trans positions of ABA type porphyrinic moiety. The prepared PEGylated porphyrin (with PEG arms at the periphery) P-(PEO)₂ was self-assembled into spheres of uniform diameter while their DMF solution was...

article

An overview on enzyme-mimicking nanomaterials for use in electrochemical and optical assays

Muhammad Nasir, Mian Hasnain Nawaz, Usman Latif, Mustansara Yaqub, more

Microchimica Acta > 2017 > 184 > 2 > 323-342

Various kinds of nanomaterials have been described in recent years that represent stable and low-cost alternatives to biomolecules (such as enzymes) for use in (bio)analytical methods. The materials typically include, metal/metal oxides, metal complexes, nanocomposites, porphyrins, phthalocyanines, smart polymers, and carbonaceous nanomaterials. Due to their biomimetic and other properties, such nano-materials...

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Search results for: Akhtar Hayat

Covalent organic frameworks (COFs) as carrier for improved drug delivery and biosensing applications

Orange Peel Derived C‐dots Decorated CuO Nanorods for the Selective Monitoring of Dopamine from Deboned Chicken

Polymer scaffold layers of screen-printed electrodes for homogeneous deposition of silver nanoparticles: application to the amperometric detection of hydrogen peroxide

A nanocomposite prepared from magnetite nanoparticles, polyaniline and carboxy-modified graphene oxide for non-enzymatic sensing of glucose

Development of a disposable electrochemical sensor for detection of cholesterol using differential pulse voltammetry

Ionic liquid coated iron nanoparticles are promising peroxidase mimics for optical determination of H₂O₂

Advantages of Carbon Nanomaterials in Electrochemical Aptasensors for Food Analysis

Photoinduced discharge of electrons stored in a TiO2-MWCNT composite to an analyte: application to the fluorometric determination of hydrogen peroxide, glucose and aflatoxin B1

Biomimetic nitrogen doped titania nanoparticles as a colorimetric platform for hydrogen peroxide detection

Functionalized graphene oxide–polypyrrole–chitosan (fGO–PPy–CS) modified screen-printed electrodes for non-enzymatic hydrogen peroxide detection

Protic ionic liquids as a versatile modulator and stabilizer in regulating artificial peroxidase activity of carbon materials for glucose colorimetric sensing

Aptamer-based zearalenone assay based on the use of a fluorescein label and a functional graphene oxide as a quencher

An electrochemical aptasensor based on functionalized graphene oxide assisted electrocatalytic signal amplification of methylene blue for aflatoxin B1 detection

Electrospinning of graphene-oxide onto screen printed electrodes for heavy metal biosensor

Disposable and portable aptamer functionalized impedimetric sensor for detection of kanamycin residue in milk sample

A novel colorimetric competitive aptamer assay for lysozyme detection based on superparamagnetic nanobeads

Biomolecular detection at ssDNA-conjugated nanoparticles by nano-impact electrochemistry

New biorecognition molecules in biosensors for the detection of toxins

Poly (ethylene oxide) tethered trans-porphyrin: Synthesis, self-assembly with fullerene (C60) and DNA binding studies

An overview on enzyme-mimicking nanomaterials for use in electrochemical and optical assays

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