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A near infrared fluorescent probe YSP for sulfite was synthesized, in which a julolidine fused with a pyran-2-one was employed as the fluorophore and the vinyl activated by an indole salt as the receptor. The introduction of julolidine and indole salt strengthens the electron push-pull effect of the probe and allows it to absorb (597 nm) and emit (681 nm) in red wavelength region. The addition of...
An open tubular capillary liquid phase chromatographic column (1 m × 25 µm i.d.× 375 µm o.d.) was prepared by incorporating metal organic framework particles modified with vancomycin directly into zwitterionic polymer coating synthesized by the copolymerization of [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl) ammonium hydroxide and N,N'-methylenebisacrylamide. The incorporation of IRMOF-3 (isoreticular...
A new fluorescent probe 7-(diethylamino)-3-((1e,3e)-5-oxo-5-phenylpenta-1,3-dien-1-yl)-2H-chromen-2-one (SPH), based on Michael addition mechanism, was designed and synthesized for selective detection of sulfite. The probe was constructed by incorporating an α,β-unsaturated ketone conjugated with a C˭C bond into the coumarin fluorophore as a specifical reaction site for sulfite utilizing its nucleophilic...
Highly sensitive and selective enrichment of endogenous peptides or proteins from complex bio-system takes a significant important place to the proteomic. In this work, a unique Fe3O4@2SiO2@mSiO2-C nanomaterial was synthesized, contributing to the separation and enrichment of low concentration peptides from complex mixture. The highly ordered mesoporous carbon structure render the nanospheres with...
A novel enzymatic reactor was prepared by incorporating SBA-15 nanoparticles into hybrid organic–inorganic monolith and immobilizing trypsin with glutaraldehyde as bridging reagent. Preparation and operation conditions including nanoparticles percentage and residence time were optimized to improve the digestion efficiency. The digestion products were characterized by Matrix Assisted Laser Desorption...
Novel open-tubular capillary electrochromatography (OT-CEC) systems with core/shell magnetic nanoparticles modified by amino or C 18 groups as stationary phase were constructed by immobilizing nanoparticles in the capillary with permanent magnets. Influence of preparation method of OT-CEC column with series stationary phases (continuous two-dimension) on column performance and effect of dispersant...
Molecular imprinting is a useful method to make enzyme mimics for protein recognition. Classic protein imprinting involves entrapping proteins within polysiloxane or polyacrylamide, but due to the rigidity of the recognition sites and the limited interaction between proteins and small molecule monomers, they often have unsatisfactory capacity, poor reproducibility and low specificity. In this report,...
The rod-shaped SBA–15–C 18 mesoporous nanoparticles were incorporated into hybrid organic–inorganic monolithic column with aminopropyl moiety to develop novel stationary phases with mixing mechanism of reverse phase and ion exchange. Experimental conditions including dispersion pattern, nanoparticles percentage were optimized for simple and stable column preparation. The monolithic columns...
A chemical potential driven micro-membrane sampler for enrichment of trace gaseous carbonyl compounds has been developed. The sampler is composed of exposed parts with membrane and analysis parts with polypropylene tube. The membrane acts as a barrier, through which the analytes dynamically diffuse and transfer from absorbents present outside to extract solvent inside through the difference of chemical...
Based on combination of chiral recognition ability of β-cyclodextrin (β-CD) derivatives and flexibility of monolithic material, a series of chiral stationary phases (CSPs) were prepared by the immobilization of β-CD and three of its derivatives to the epoxy-activated poly(glycidyl methacrylate-co-ethylene dimethacrylate) monolith under mild condition. Immobilization condition for the connection reaction...
Monolith with immobilized pH gradient (M-IPG) is a novel separation matrix for amphoteric substances, such as peptides and proteins. To improve the properties of the newly designed column, efforts were made to optimize the preparation procedure, including the concentrations of the monomers, glycidyl methacrylate (GMA) and ethylene glycol dimethacrylate (EDMA), as well as the kinds of porogens, which...
In this study, a 38mL monolith with homogeneous porous structure was produced by a single polymerization from glycidyl methacrylate (GMA) and ethylene dimethacrylate (EDMA) in the presence of porogens and an initiator. The uniform temperature distribution within the reaction system was achieved by adding reactant mixture continuously and enhancing the heat transfer ability of the polymerization system...
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