41results about How to "Achieve selective enrichment" patented technology

The invention provides a preparation method of an embedded attapulgite capillary monolithic column. The method comprises the following steps of mixing acidified attapulgite and an organic polymer solution at a mass ratio being 1:100 to 5:100; performing magnetic stirring for 1 to 5 hours at the normal temperature so that the acidified attapulgite is completely dispersed; then, injecting the material into a quartz capillary treated by gamma-2-methyl propyl trimethoxy silane; sealing the material; then putting the materials into a constant-temperature water bath pot for reaction for 16 to 24h at 60 to 85 DEG C; after the reaction is completed, using acetonitrile and water for flushing; preparing the material for use. The natural attapulgite nanometer materials are embedded into an organic polymer monolithic material for the first time; the embedded attapulgite capillary monolithic column is prepared. The preparation method has the advantages that the simplicity is realized; the cost is low; the reaction condition can be easily controlled; the prepared embedded attapulgite capillary monolithic column has higher mechanical intensity and higher permeability; when the prepared embedded attapulgite capillary monolithic column is used as an adsorbing agent to be applied to solid micro extraction, the advantages of great adsorption volume, high recovery yield, good reproducibility, low detection limit and the like are realized. The preparation method is applicable to the sample pretreatment of polar small-molecular compounds.

The invention discloses a method for enriching glycopeptide and simultaneously enriching glycopeptide and phosphorylated peptide by using a metal oxide. The method is characterized in that: the metal oxide is used as a solid-phase extraction material for separating and enriching the glycopeptide from protein enzymolysis solution, and simultaneous enrichment of the phosphorylated peptide and the glycopeptide can be realized in a sample by using simple operation. Specifically, the method comprises the following steps of: mixing the metal oxide and the sample under a neutral or weak acid condition, eluting the mixture under an acid condition to obtain the glycopeptide, and eluting the mixture under an alkali condition to obtain the phosphorylated peptide. The method can realize high-efficiency and high-selectivity enrichment of the phosphorylated peptide and the glycopeptide in the same sample.

The invention relates to the field of material analysis chemistry and organic chemistry. The invention provides a phosphopeptide enriching material and a preparation method and application thereof. The phosphopeptide enriching material comprises a substrate and a double-ingredient copolymer layer formed on the surface of the substrate, wherein the thickness of the double-ingredient copolymer layer is 10 to 80nm. The surface initiation-atom transfer free radical polyreaction mechanism is utilized; the double-ingredient copolymers are grafted on the surface of the substrate. The material and column solid phase extraction mode or dispersion solid phase extraction mode are organically combined; the enriching with high selectivity, high repetitiveness and high flux of phosphopeptide in a complicated mixture can be realized, so that the selective enriching of the multi-phosphopeptide and mono-phosphopeptide can be realized; the phosphorylated protein identification number can be obviously improved. Therefore the phosphopeptide enriching material is hopeful to be widely applied to the aspects of phosphopeptide enriching, further large-scale separation of phosphorylated protein and the like.

The invention relates to the preparation and application of a guanidine-based immobilized affinity magnetic sphere with a core-shell structure, which adopts superparamagnetic iron tetroxide microspheres as a substrate, and 3-(trimethoxysilyl)methanol is bonded on the surface Vinyl-modified magnetic spheres were formed from acrylate-based acrylates, and polymer-coated magnetic spheres with a core-shell structure were obtained by distillation-precipitation polymerization; guanidinium-immobilized core-shell structures were obtained by functional modification of the polymer layer. Polymer coated magnetic balls. In the preparation material of the present invention, utilizing the strong interaction between the guanidinium group and the phosphate group, the polyphosphopeptides in the α-casein (α-casein) or β-casein (α-casein) enzymolysis solution can be respectively realized Or the selective enrichment of all phosphopeptides, the enrichment capacity for phosphopeptides reaches 200 mg / g, the detection limit for phosphopeptides reaches 0.5 fmol, and the recovery rate for phosphopeptides enrichment reaches 91.30%. Utilizing the superparamagnetism of the material, rapid and complete separation can be achieved within 30s.

The invention discloses an application method of a hydrophobic extractant in a cloud point extraction system. The extractant is carried into the cloud point extraction system by forming an O / W microemulsion, which skillfully solves the problem of poor water solubility of the extractant. The problem of being unable to solubilize in the system has successfully realized the selective enrichment of target ions by the cloud point extraction system. The invention realizes the application of hydrophobic extractant in the cloud point extraction system for the first time, and the cloud point extraction technology can still selectively enrich the target actinide ions under the interference of many lanthanide ions, which is efficient and fast, and avoids a large amount of organic waste The production of liquid reduces environmental pollution, simplifies the post-processing process, and reduces post-processing costs. In addition, the combined use of ICP-MS can also realize the rapid and accurate detection of trace target ions, which can form a universal separation and analysis method.

The invention belongs to the technical field of high molecular materials and analysis and relates to a monodisperse core-shell structure polymer nano particle as well as preparation and application thereof. The polymer nano particle is a core-shell type copolymer of an acrylic acid cross-linking agent and a monoene phenylboronic acid functional monomer; and the polymer nano particle is prepared by using a one-pot method, that is, precipitation polymerization with the combination of in-situ package strategy. Synthesis steps of the conventional core-shell structure polymer particles are simplified, and the polymer nano particle has the characteristics of rapidness, convenience and easiness, low cost, multiple boric acid functional monomers on the surface, and the like. The polymer nano particle can be used for separating or enriching glycoprotein with a 1,2-cis-glycol structure, and has good practical values and application prospects in the fields of proteomics and the like.

The present invention relates to the fields of material analysis chemistry, post-translational modification proteomics and the like, and provides a method for separating and enriching glycopeptides. According to the method, a highly nitrogen-doped carbon material having a two-dimensional porous crystal structure contacts a proteolysate, the hydrophilic interaction, the electrostatic interaction, CH3-pi and other actions between the material and glycopeptides are used, glycopeptides are separated and enriched by using a solid-phase extraction (SPE) or dispersive solid-phase extraction (dSPE) separation mode, and the sample is analyzed through mass spectrometry. According to the present invention, by optimizing the compositions, the pH values, the buffer salts and other parameters of the sample solution, the leaching solution and the eluent, the selective enrichment of glycopeptides is achieved; and the method has advantages of good stability, high selectivity, large adsorption capacity,strong flexibility, easy and controllable operation and the like, and can be used for the glycopeptide enrichment of standard products and complex samples.