Search results for " biosensor"

showing 10 items of 60 documents

SMOOTHLY SHIFTING FLUORESCENT WINDOW: TUNABLE “OFF-ON-OFF” MICELLAR BIOSENSORS FOR pH

2009

POLYMERIC MICELLES fluorescent biosensorpH-windowSettore CHIM/09 - Farmaceutico Tecnologico Applicativoself-assembling
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Novel Immune TiO2 Photoluminescence Biosensors for Leucosis Detection

2012

Abstract Novel immune photoluminescent biosensor, based on TiO2 nanoparticles, for retroviral leucosis detection has been developed. The photoluminescence spectra were excited by solid state laser with wavelength 355 nm and measured in the range of 370-800 nm. Original photoluminescence spectrum of TiO2 nanoparticles showed wide maximum at 515 nm. The biosensitive layer was formed by immobilization of retroviral leucosis antigens on the surface of TiO2 nanoparticles. Immobilization of antigens on TiO2 surface led to UV-shift of photoluminescence spectrum and increase of PL intensity. The response to different concentrations of retroviral leucosis antibodies has been measured. The decrease o…

PhotoluminescenceMaterials scienceTio2 nanoparticlesAnalytical chemistryleucosis detectionGeneral MedicinePhotochemistryLeucosisimmune biosensorsAdsorptionImmune systemExcited statephotoluminescenceBiosensorEngineering(all)TiO2 nanostructuresProcedia Engineering
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Application of Room Temperature Photoluminescence From ZnO Nanorods for Salmonella Detection

2014

ZnO nanorods grown by gaseous-disperse synthesis are confirmed by XRD analysis to have the wurtzite crystal structure. The obtained crystallites, as found from SEM studies, are 57 +/- 9 nm in diameter and 470 +/- 30 nm long on the average. Two emission bands of photoluminescence from ZnO nanorods observed at room temperature are centered at 376 and 520 nm. A biosensitive layer is prepared by immobilization of anti-Salmonella antibodies from liquid solutions on the ZnO surface. Immobilization of the biosensitive layer onto ZnO nanorods is found to increase the intensity of PL. After further reaction with Salmonella antigens (Ags), the PL intensity is found to decrease proportional to Ag conc…

PhotoluminescenceMaterials scienceZnO nanorods; biosensors; photoluminescence; sensor phenomena; characterizationZinc compoundsAnalytical chemistryNanotechnologyKemiNanolithographyChemical SciencesNanorodCrystalliteElectrical and Electronic EngineeringInstrumentationLayer (electronics)BiosensorWurtzite crystal structureIEEE Sensors Journal
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Printing Biology: engineering analytical platforms by molecular inks

2021

Printing Biology Biosensors Microarray platforms
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Early stage diagnosis of programmed cell death (apoptosis) using electroanalysis: Nanomaterial and methods overview

2017

Timely monitoring of apoptosis can effectively assist early diagnosis of related diseases and continuous evaluation of the efficacy of drugs. Therefore, developing advanced methods for apoptosis evaluation has attracted more and more attention. In addition, the increased demand for understanding the early stages of apoptosis is pushing the envelope for solutions in early instance real-time monitoring of death kinetics. In this review, various types of electro-analytical methods for detection of apoptosis were discussed. The emphasis is placed in diagnosis of apoptosis based on cyto-, immune-, geno-, apta-, and peptide based biosensing strategies. In the first part of review, various electro…

Programmed cell deathComputer sciencebusiness.industry010401 analytical chemistryNanotechnology02 engineering and technologyComputational biology021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesAnalytical ChemistryContinuous evaluationApoptosisElectrochemical biosensor0210 nano-technologybusinessSpectroscopyBiomedicineTrAC Trends in Analytical Chemistry
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Biosensors for the determination of SARS-CoV-2 virus and diagnosis of COVID-19 infection

2022

Monitoring and tracking infection is required in order to reduce the spread of the coronavirus disease 2019 (COVID-19), induced by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). To achieve this goal, the development and deployment of quick, accurate, and sensitive diagnostic methods are necessary. The determination of the SARS-CoV-2 virus is performed by biosensing devices, which vary according to detection methods and the biomarkers which are inducing/providing an analytical signal. RNA hybridisation, antigen-antibody affinity interaction, and a variety of other biological reactions are commonly used to generate analytical signals that can be precisely detected using electro…

QH301-705.5immune complexSARS-CoV-2 virusBiosensing TechniquesReviewCatalysisInorganic Chemistryelectrochemical immunosensorsCOVID-19 TestingHumansSerologic TestsPhysical and Theoretical ChemistryBiology (General)Molecular BiologyQD1-999SpectroscopySARS-CoV-2bioelectrochemistryOrganic ChemistryCOVID-19General MedicineRNA analysisbiosensorsimmobilisation of biomoleculesNanostructuresComputer Science ApplicationsChemistryMolecular Diagnostic Techniquesmolecularly imprinted polymers (MIPs)antigen-antibody interactionCOVID-19 ; SARS-CoV-2 virus ; biosensors ; electrochemical immunosensors ; bioelectrochemistry ; RNA analysis ; antigen-antibody interaction ; immune complex ; immobilisation of biomolecules ; molecularly imprinted polymers (MIPs)
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Chromium inhibition and size-selected Au nanocluster catalysis for the solution growth of low-density ZnO nanowires.

2015

The wet chemical synthesis of nanostructures has many crucial advantages over high-temperature methods, including simplicity, low-cost, and deposition on almost arbitrary substrates. Nevertheless, the density-controlled solution growth of nanowires still remains a challenge, especially at the low densities (e.g. 1 to 10 nanowires/100 μm(2)) required, as an example, for intracellular analyses. Here, we demonstrate the solution-growth of ZnO nanowires using a thin chromium film as a nucleation inhibitor and Au size-selected nanoclusters (SSNCs) as catalytic particles for which the density and, in contrast with previous reports, size can be accurately controlled. Our results also provide evide…

Sensors and biosensors Synthesis and processing NanowiresSettore ING-INF/01ArticleScientific reports
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POLYMERIC MICELLES AS TUNABLE OFF-ON-OFF pH WINDOW BIOSENSORS.

2009

Settore CHIM/09 - Farmaceutico Tecnologico ApplicativoPOLYMERIC MICELLES BIOSENSORS.
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Rapid and eco-friendly synthesis of graphene oxide-silica nanohybrids

2014

The increasing interest in Graphene oxide (GO) is due to many issues: the presence of both sp2-conjugated atoms and oxygen-containing functional groups provides a strong hydrophilicity and the possibility to further functionalize it with other molecules (i.e. π-π interactions covalent attachment etc.) [1]. Furthermore since the GO is biocompatible and noncytotoxic many studies have been recently focused on the development of GO-based nanodevices for bioimaging DNA detection drug delivery. Due to their low cytotoxicity and large internal surface area silica nanoparticles have been taken into account as promising material for biolabeling and drug loading/delivery. Particular consideration has recently been demonstrated for GO-silica composites because of the potentialities for electrical applications their chemical inertia and stability toward ions exposure. The possibility to combine the extraordinary properties of GO and silica offers several advantages for the realization of nanoprobes for biological applications and of biosensor [12]. The strategy for the fabrication of GO-nanosilica nanohybrids can be schematized as follows: (i) synthesis of GO by oxidizing graphite powder with the method described by Marcano et al. [3] (ii) Preparation of oxygen-loaded silica nanoparticles by thermal treatments in controlled atmosphere in order to induce high NIR emission at 1272 nm from high purity silica nanoparticles. (iii) preparation of GrO-silica nanohybrid films via rapid solvent casting in water. The nanohybrids were tested by XPS FTIR Raman analysis UV photoluminescence analysis TGA Zeta potential measurements electrical tests AFM and SEM. Several nanohybrids were prepared by combining two different typologies of GO and two different samples of silica.
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Toward development of optical biosensors based on photoluminescence of TiO2 nanoparticles for the detection of Salmonella

2017

Quality control of food and agriculture production is an inseparable part of human safety and wellbeing. Salmonella infections belong to one of the most monitored pathogens in the world, therefore advanced determination of this pathogen can decrease the risks of human diseases caused by this microorganism. In this research we introduce a novel optical immunosensor for determination of Salmonella typhimurium. The immunosensor is based on Titanium dioxide (TiO2) nanoparticles deposited on glass substrates (glass/TiO2)center dot TiO2 nanoparticles exhibit an intense photoluminescence (PL) in the visible range of spectrum at room temperature. The direct immobilization of antibodies (anti-S-Ab) …

TiO2 nanoparticles; Photoluminescence based biosensor; Immunosensor; Salmonella infection; AntibodySalmonellaPhotoluminescenceMaterials scienceNanoparticleNanotechnology02 engineering and technology010402 general chemistrymedicine.disease_cause01 natural sciencesAnalytical Chemistrychemistry.chemical_compoundAnalytisk kemiMaterials ChemistrymedicineHuman safetyElectrical and Electronic EngineeringInstrumentationTio2 nanoparticlesMetals and Alloys021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialschemistryTitanium dioxideVisible range0210 nano-technologyBiosensorSensors and Actuators B: Chemical
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