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A new highly selective fluorescent chemosensor for formaldehyde (FA) has been synthesized based on boron dipyrromethene as fluorophore and o-phenylenediamine (OPDA) as reaction group. When FA is added, the fluorescence emission band of the chemosensor red shift (from 525 nm to 548 nm) accompanied by an increase in intensity with strong green fluorescence was observed. This chemosensor also exhibited...
A novel mitochondria-targeted ratiometric near-infrared fluorescence probe NDMBT for Sulfur dioxide (SO2) derivatives was constructed based on the SO2 derivatives-triggered Michael addition reaction. It displayed ultrafast response time (within 10s), large hypsochromic shift (260nm), high photostability, excellent selectivity and high sensitivity in aqueous media with a detection limit of 43nM. More...
A turn-on fluorescent probe (Naphsulf-O) for hydrazine was developed by protecting the hydroxy group of the fluorophore 6-acetyl-2-hydroxynaphthalene via O-4-nitrobenzenesulfonylation, where 4-nitrobenzene was used as a fluorescence quenching moiety as well as an electrophile. Upon nucleophilic aromatic substitution (NAS) reaction of hydrazine toward the probe, the protecting group was removed and...
Chlorinated benzenes are typical precursors and indicators for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) emissions from waste incinerators. Online and real-time monitoring of chlorobenzenes is a challenge due to their low concentration and complex nature of the flue gas. In this work, a continuous online monitoring system was built for detection of trace chlorinated benzenes based...
In this paper, 3-aminobenzeneboronic acid functionalized Mn2+-doped ZnTe/ZnSe quantum dots (APBA-dQDs) were prepared. The APBA functional groups had strong binding ability with F–, resulting in the quenchment of dQDs photoluminescence (PL). Under the optimal condition, the fluorescence intensity of APBA-dQDs was related linearly to the concentration of F– in the range of 0.25–1.5µmol/L with a detection...
A polydimethylsiloxane (PDMS) microfluidic chemiluminescence (CL) immunodevice for sensitive detection of human immunoglobin G (IgG) with the signal amplification strategy was developed in this work. The immunodevice was prepared by covalently immobilizing capture antibodies (Abs) on the silanized microchannel of microfluidic chip. Gold nanoparticles (AuNPs) functionalized with a high molar ratio...
An environmentally friendly and sensitive method for determination of blockers and agonists was described in this paper. The method is based on a homemade sol–gel solid-phase microextraction (SPME) coating with simultaneous on-fiber derivatization and subsequent gas chromatography mass spectrometry (GC/MS) analysis. The influences of the main factors on the type and thickness of the homemade fiber...
A laminated paper-based analytical device (LPAD) combined with gold nanoparticles (AuNPs) catalyzed luminol chemiluminescence (CL) system for the determination of l-cysteine (l-cys) was presented here. It is based on the principle that l-cys can greatly inhibit CL signal of AuNPs–luminol–H 2 O 2 system. The paper-based device was fabricated by a low-cost cutting method, followed by...
The residue of pesticide has posed a serious threat to human health. Fast, broad-spectrum detection methods are necessary for on-site screening of various types of pesticides. With citrate-coated Au nanoparticles (Au NPs) as colorimetric probes, a visual and spectrophotometric method for rapid assay of cartap, which is one of the most important pesticides in agriculture, is reported for the first...
Hemoglobin (Hb) modified magnetic nanocomposites are prepared by immobilization of Hb onto the surface of amino-functionalized Fe 3 O 4 @SiO 2 magnetic nanoparticles via covalent bonding with glutaraldehyde as cross-linker. The obtained nanocomposites are characterized with FT-IR, SEM, XRD and surface charge analysis. A direct solid-phase extraction procedure for the isolation/separation...
In this paper, water-miscible ionic liquid (IL) such as 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) is introduced for the first time as a novel multifunctional acceptor phase additive in hollow-fiber protected liquid phase microextraction (HF-LPME). For investigating the performances of [BMIM]Cl, it was respectively mixed with NaOH, HCl and deionized water. And their extraction performance was...
The heavy metal ions–nucleobases interaction is an important research topic in environmental and biochemical analysis. The presence of the silver ion (Ag + ) may influence the formation of oxidation intermediate and the electrocatalytic oxidation activity of guanine (G), since Ag + can interact with guanine at the binding sites which are involved in the electrocatalytic oxidation reaction...
We have developed a fluorescence technique for the detection of Hg 2+ and Pb 2+ ions using polythymine (T 33 )/benzothiazolium-4-quinolinium dimer derivative (TOTO-3) and polyguanine (G 33 )/terbium ions (Tb 3+ ) conjugates, respectively. Hg 2+ ions induce T 33 to form folded structures, leading to increased fluorescence of the T 33 /TOTO-3...
Using a single-walled carbon nanotubes (SWCNTs) as stationary phase of solid-phase microextraction (SPME) fibers, a simple, low cost and environmentally friendly method for extraction of 13 pesticides in Tea samples has been developed following gas chromatography–mass spectrometric determination. Potential factors affecting the extraction efficiency were investigated and optimized, including extraction...
The influence of silver ions on Escherichia coli and Staphylococcus epidermidis has been investigated by atomic force microscopy (AFM). Both single cell and cell communities were visualized, and the nanoscale ultrastructure images of these two bacteria strains before and after stimulation of silver ions were obtained. The results showed that in the case of E. coli after treatment with silver ions,...
A new solid phase microextraction (SPME) method coupled with gas chromatography–mass spectrometry (GC–MS) was developed for rapid determination of four anabolic steroids such as 3α-hydroxy-5α-androstane-17-one (HA), dihydrotestosterone (DHT), androstenedione (AD) and methyltestosterone (MT) in pig urine. SPME was used to extract the four anabolic compounds directly without derivatization. The optimum...
Quercetin greatly enhanced luminol electrochemiluminescence of quercetin in alkaline solution. When the concentration of luminol was 0.1molL −1 , the detection limit for quercetin was 2.0×10 −8 molL −1 with a linear range from 1.0×10 −7 to 2×10 −5 molL −1 . The pH and buffer substantially affected ECL intensity. Quercetin was autoxidized in alkaline...
A novel chemiluminescence (CL) flow system for the determination of chlortetracycline is described. It is based on the direct CL reaction of chlortetracycline and [Cu(HIO 6 ) 2 ] 5- in KOH medium. The unstable [Cu(HIO 6 ) 2 ] 5- was on-line electrogenerated by constant-current electrolysis. The CL intensity was linear with chlortetracycline...
A simple and sensitive flow-injection chemiluminescence (CL) system for automated dissolution testing is described and evaluated for monitoring of dissolution profiles of isoniazid tablets. The undissolved suspended particles in the dissolved solution were eliminated via on-line filter. The novel CL system of KIO 4 -isoniazid was also investigated. The sampling frequency of the system was...
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