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A multi-walled carbon nanotubes (MWNTs) bridged mesocellular graphene foam (MGF) nanocomposite (MWNTs/MGF) modified glassy carbon electrode was fabricated and successfully used for simultaneous determination of ascorbic acid (AA), dopamine (DA), uric acid (UA) and tryptophan (TRP). Comparing with pure MGF, MWNTs or MWNTs/GS (graphene sheets), MWNTs/MGF displayed higher catalytic activity and selectivity...
Here, we report on a novel nonenzymatic amperometric glucose sensor based on CuO nanoneedle/graphene/carbon nanofiber modified electrode. The results of the scanning electron microscopy indicate that electronic network was formed through their direct binding with the graphene/carbon nanofiber, which leads to larger active surface areas and faster electron transfer for the glucose sensor. High electrocatalytic...
Multifunctional fluorescent silica nanoparticles with phenylboronic acid tags were developed for labeling sialic acid on the surface of living cancer cells. In this paper, fluorescent silica nanoparticles (FSNPs) with strong and stable emission at 515nm were firstly prepared through a reverse microemulsion process, and then modified with highly selective phenylboronic acid (PBA) tags on their surface...
A novel microfluidic chip coupled with near-infrared (NIR) fluorescence detection set-up was established for specific analysis of trace Hg 2+ . Based on the NIR fluorescence changes caused by Hg 2+ -induced dissolution and aggregation of label-free single-strand DNA (ssDNA) wrapped single-walled carbon nanotubes (SWNTs), Hg 2+ in aqueous solution were detected sensitively and...
Characterization and application of graphene sheets modified glassy carbon electrodes (graphene/GC) have been presented for the electrochemical bio-sensing. A probe molecule, potassium ferricyanide is employed to study the electrochemical response at the graphene/GC electrode, which shows better electron transfer than graphite modified (graphite/GC) and bare glassy carbon (GC) electrodes. Based on...
Micro-total analysis systems (μTAS) integrate different analytical operations like sample preparation, separation and detection into a single microfabricated device. With the outstanding advantages of low cost, satisfactory analytical efficiency and flexibility in design, highly integrated and miniaturized devices from the concept of μTAS have gained widespread applications, especially in biochemical...
A sensitive molecularly imprinted electrochemical sensor was created for selective detection of a tricyclic antidepressant imipramine by combination of Au nanoparticles (Au-NPs) with a thin molecularly imprinted film. The sensor was fabricated onto the indium tin oxide (ITO) electrode via stepwise modification of Au-NPs by self-assembly and a thin film of molecularly imprinted polymers (MIPs) via...
A poly-ABSA/SWNTs composite-modified electrode was fabricated by electropolymerizing aminobenzene sulphonic acid (ABSA) on the surface of glassy carbon electrode (GCE) modified with single-wall carbon nanotubes (SWNTs). SWNTs provide a 3D porous and conductive network for the polymer immobilization. The nanocomposite film was characterized by scanning electron microscope (SEM) and electrochemical...
Clozapine, an effective antipsychotic drug, was found generating a pair of redox peaks at about 0.33–0.4V (versus SCE) at 16-mercaptohexadecanoic acid (i.e. MHA) self-assembled monolayer (SAM) modified gold electrode (i.e. MHA/Au) in 0.05molL −1 Tris–HCl (pH 8.1) buffer solution. Sensitive and quantitative measurement of clozapine based on anodic peak was established under optimum conditions...
A sensitive and label-free electrochemical impedance immunosensor via covalent coupling the antibody with functionalized gold nanoparticles (FAuNP) for probing apolipoprotein A-I was presented. The hybrid gold nanoparticles were prepared with a two-in-one strategy, i.e. via the stepwise employment of self-assembled monolayer (SAM) and sol–gel techniques, to improve the performance of such a label-free...
A mediator-free amperometric biosensor for screening organophosphorus pesticides (OPs) in flow-injection analysis (FIA) system based on anticholinesterase activity of OPs to immobilized acetylcholinesterase enzyme (AChE) has been developed. The enzyme biosensor is prepared by entrapping AChE in Al 2 O 3 sol–gel matrix screen-printed on an integrated 3-electrode plastic chip. This strategy...
The fabrication and application of an end-column amperometric detection (AD) system with a carbon electrode for capillary-column liquid chromatography (CLC) were described. This new amperometric detector showed good sensitivity and stability in detecting the thiocompounds and other analytes with CLC. In order to obtain the better separation and detection performance for analytes, several operational...
The carbon film based ring-disk dual electrodes in the thin-layer radial flow cell are used as the dual electrochemical detector (DECD) for liquid chromatography (LC) to determine the monoamine neurotransmitters. Cyclic voltammetric experiments show there has great difference in the reversibility of the oxidative reactions of dopamine and ascorbate. Therefore the ring-disk dual electrode arrangement...
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