The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A simple, rapid, and ultrasensitive fluorescence strategy for adenosine triphosphate (ATP) detection was developed by using a FAM (carboxyfluorescein) labeled DNA (FAM-DNA). In this strategy, highly fluorescent FAM-DNA was used as a probe, and nanoceria (CeO2 NPs) acted as an efficient quencher. FAM-DNA attached to the surface of nanoceria through the coordination between the phosphate group of DNA...
It is known that DNA molecules can be used to build a various of complicated geometrical DNA nanostructures with programmable sequence design, and these DNA nanomaterials show a promising application in biotechnology and biomedicine. However, the construction of large-sized three dimensional DNA-based nanomaterials still remains a challenge. In this work, we propose a new strategy that only employs...
A simple fluorescent probe HBI-GR based on the combination of the fluorophore (p-HBI) in green fluorescent protein (GFP) and Guanine riboside (GR) for HSA was successfully synthesized. HBI-GR showed an obvious fluorescence enhancement toward HSA without interference from other proteins, amino acids, anions and commonly existing metal ions. HBI-GR exhibited high sensitivity towards HSA with a good...
In the present work, an enzyme-free and signal amplified nucleic acids detection method based on the fluorescent nucleotide base analog pyrrolo-deoxycytidine (P-dC) and catalyzed hairpin assembly (CHA) has been developed. In the CHA signal amplification system, two hairpin auxiliary probes, H1 and H2, which containing a fluorescent P-dC at the end of the stem, respectively, were used as the fluorescent...
The detection of Hg2+ has attracted considerable attention because of the serious health and environmental problems caused by it. Herein, a novel ratiometric fluorescent chemsensor (GQDs–SR) based on the fluorescence resonance energy transfer (FRET) process for detecting of Hg2+ was designed and synthesized with rhodamine derivative covalently linked onto graphene quantum dots. In this sensor, the...
Ascorbic acid (AsA), also known as vitamin C, is a vital small-molecule antioxidant with multiple functions in vivo. It’s the major natural antioxidant found in plants and is also an essential component of human nutrition. AsA plays a key role in many diseases-related biological metabolism. Therefore, sensitive and selective detection of AsA is greatly important in pharmaceutical, clinical and food...
In this paper, a colorimetric and “turn-on” fluorescent sensor (Py–Si–Fe 3 O 4 @SiO 2 NPs) for Hg 2+ detection was designed with pyrene derivative covalently grafted onto the surface of magnetic core/shell Fe 3 O 4 @SiO 2 nanoparticles using the silanol hydrolysis approach. The Py–Si–Fe 3 O 4 @SiO 2 inorganic–organic hybrid...
In this paper, a simple and green strategy, based on the electrophoresis deposition technology, was reported to prepare Ag nanoparticles (NPs) modified TiO 2 nanotube arrays (NTs). The morphologies of AgNPs, TiO 2 NTs and AgNPs/TiO 2 NTs were characterized by transmission electron microscope (TEM) and scanning electron microscope (SEM). The results demonstrate that the surface...
CuO nanofibers (NFs), prepared by electrospinning and calcination technologies, have been applied for the fabrication of glucose sensors with high sensitivity and selectivity. Cu(NO 3 ) 2 and polyvinylpyrrolidone (PVP) composite nanofibers were initially electrospun on the surface of indium tin oxide (ITO) glass, and then the CuO NFs–ITO electrode was formed simply by removing PVP...
Graphene decorated with gold nanoparticles (AuNPs–β-CD–Gra) has been synthesized by in situ thermal reduction of graphene oxide and HAuCl 4 with β-cyclodextrin (β-CD) under alkaline condition. The AuNPs–β-CD–Gra product was well characterized by infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and selected area...
A novel prepared mercuric ion PVC membrane sensor based on a Rhodamine B derivative (RND) as a selective sensing material was described. The sensor exhibited a specific fluorescent off-on response to Hg 2+ , and showed a linear response over the Hg 2+ concentration range from 1.0×10 −9 to 2.0×10 −3 M with a very low detection limit of 8.1×10 −10 M in bulk method...
Gold nanoparticles-poly(luminol) (Plu-AuNPs) hybrid film and multi-walled carbon nanotubes with incorporated β-cyclodextrin modified glassy carbon electrode (β-CD-MWCNTs/Plu-AuNPs/GCE) was successfully prepared for simultaneous determination of dopamine (DA) and uric acid (UA). The surface of the modified electrode has been characterized by X-ray photo-electron spectroscopy (XPS), energy dispersive...
A novel rhodamine-based fluorescent chemosensor (RND) was synthesized that contains two independent fluorophores and acts as a very sensitive, selective and reversible off–on probe for Hg(II). Importantly, this newly developed sensing system exhibited different fluorescent responses toward Hg(II) and Mg(II) at 589nm and 523nm, respectively. RND also displayed detectable color change upon treatment...
A simple and sensitive method has been developed for simultaneous analysis of three catecholamines: dopamine (DA), epinephrine (EP) and norepinephrine (NE) in urine by capillary electrophoresis (CE) coupled with in-column fiber-optic light-emitting diode-induced fluorescence detection (ICFO-LED-IFD). Fluorescein isothiocyanate was used as the fluorescence tagged reagent for derivatization of DA, EP...
Highly ordered titanium dioxide (TiO 2 ) nanotubes film was successfully synthesized via anodic oxidation of a Ti foil in an ammonium fluoride-based ethylene glycol solution. The electrogenerated chemiluminescence (ECL) behavior of the resulting TiO 2 nanotubes film was subsequently studied. Strong ECL emission was observed at −1.40V (vs. Ag/AgCl) and the ECL spectrum displayed three...
A novel instrument was developed using a multi-wavelength pulsed LED array with in-column optic-fiber induced fluorescence detection by capillary electrophoresis. The light from 2 different wavelength LEDs (450nm and 480nm) was pulsed for short intervals at high intensity. The beam from each LED was collimated and reshaped with the gradient index (GRIN) lens group to achieve a highly effective coupling...
A facile green biosynthesis method has been successfully developed to prepare gold nanoparticles (AuNPs) of various core sizes (25±7nm) using a natural biomaterial, eggshell membrane (ESM) at ambient conditions. In situ synthesis of AuNPs-immobilized ESM is conducted in a simple manner by immersing ESM in a pH 6.0 aqueous solution of HAuCl 4 without adding any reductant. The formation of AuNPs...
Capillary electrophoresis (CE) coupled with fiber-optic light-emitting diode-induced fluorescence detection has been developed for the separation of tyrosine (Tyr) enantiomers. R(−)-4-(3-isothiocyanatopyrrolidin-1-yl)-7-(N,N-dimethylaminosulfonyl)-2,1,3-benzoxadiazole was used as a chiral fluorescence tagged reagent for derivatization of Tyr. The effect of pH, running buffer concentration and applied...
A new material—poly{methyl[3-(2-hydroxy-3,4-difluoro)phenyl]propyl siloxane}(PMDFPS) sensitive to toxic organophosphate vapor was synthesized with 2,3-difluorophenol, allyl bromide and poly (methyl hydrosiloxane) as raw materials, via O-alkylation, Claisen rearrange reaction and hydrosilylation reaction. This novel material was then coated on a quartz crystal microbalance (QCM) to investigate its...
Aminopyrene was convalently anchored onto the surface of mesoporous MCM-41 silica by post-grafting. This organic–inorganic hybrid has been applied as sensing material to phenols determination. Experimental results reveal that the functionalized material presents good sensitivity and selectivity towards resorcinol and can be used for resorcinol determination in water at pH 6.0. The fluorescence intensity...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.