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A label-free non-aggregation colorimetric sensor has been designed for the detection of Cu 2+ , based on Cu 2+ catalyzing etching of gold nanorods (AuNRs) along longitudinal axis induced by dissolve oxygen in the presence of S 2 O 32− , which caused the aspect ratio (length/width) of AuNRs to decrease and the color of the solution to distinctly change. The linear...
Fe 3+ can catalyze H 2 O 2 to oxidize along on the longitudinal axis of gold nanorods (AuNRs), which caused the aspect ratio of AuNRs to decrease, longitudinal plasmon absorption band (LPAB) of AuNRs to blueshift (Δλ) and the color of the solution to change obviously. Thus, a rapid response and highly sensitive non-aggregation colorimetric sensor for the determination of Fe...
This study proposes a sensitive method for the simultaneous separation and concentration of 9 pairs of amino acid enantiomers by combining poly(ethylene oxide) (PEO)-based stacking, β-cyclodextrin (β-CD)-mediated micellar electrokinetic chromatography (MEKC), and 9-fluoroenylmethyl chloroformate (FMOC) derivatization. The 9 pairs of FMOC-derivatized amino acid enantiomers were baseline separated using...
Sensitive and reliable methods for simultaneous determination of polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs) in limited volumes of human serum or plasma need to be further documented especially when they accumulate at low levels that are still capable of disrupting endocrine and immune functions, and affecting neurodevelopment and reproduction. The objective of this...
The CdS/TiO 2 –fluorescein isothiocyanate (FITC) luminescent nanoparticles (CdS/TiO 2 –FITC) with the particle size of 20nm have been synthesized by sol–gel method. CdS/TiO 2 –FITC could emit the fluorescence of both FITC and CdS/TiO 2 . The fluorescence resonance energy transfer (FRET) occurred between the donor CdS/TiO 2 and the acceptor FITC in the CdS/TiO...
This paper presents on-line simultaneous concentration and separation of cationic and anionic neurochemicals by capillary electrophoresis (CE) with UV absorbance spectroscopy. Neurochemical stacking exploits differences in local electric field and viscosity between the sample zone and the background electrolyte (BGE). To achieve these discontinuous conditions for CE, neurochemicals were prepared in...
We describe the development of an immunoassay using an antibody–silver nanoparticle (Ab–AgNP) conjugate as a catalyst for the silver enhancement reaction. The immuno-reaction signals that were magnified by silver metal precipitation were quantified using a commercial flatbed scanner. Protein A from Staphylococcus aureus (S. aureus), a common clinical pathogenic bacterium, was used in this research...
We describe the stacking and separation of d- and l-aspartic acid (Asp) by capillary electrophoresis (CE) with light-emitting diode-induced fluorescence detection (LEDIF). In the presence of cyanide, d- and l-Asp were derivatized with naphthalene-2,3-dicarboxaldehyde (NDA) to form fluorescent derivatives prior to CE-LEDIF. The separation of NDA-derivatized d- and l-Asp was accomplished using a discontinuous...
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