3results about How to "Regular channel structure" patented technology

This invention discloses a magnetic solid-phase extraction method for detecting trace amounts of glucocorticoids in hydrophilic media, belonging to the field of sample pretreatment and chromatographic analysis technology. The method includes: adjusting the pH of a hydrophilic medium sample containing glucocorticoids and adding an ionic strength modifier to obtain a pretreated sample; mixing a magnetic covalent organic framework-based composite nanomaterial with the pretreated sample and performing oscillatory extraction under a dynamic gradient magnetic field to adsorb the glucocorticoids onto the material surface; separating the material adsorbed with glucocorticoids using an external magnetic field and discarding the supernatant; performing ultrasonic-assisted elution of the material using an elution solvent and collecting the eluent; and detecting the eluent using high-performance liquid chromatography-diode array detector (HPLC-DID) and calculating the glucocorticoid concentration based on a standard curve.

This invention discloses a covalent organic framework composite membrane, its preparation method, and its applications, belonging to the fields of materials chemistry and analytical chemistry. The covalent organic framework composite membrane comprises a porous polymer substrate membrane, a polydopamine-mediated layer, and a covalently bonded functional layer. The functional layer is formed by linking 2,5-dihydroxy-1,4-phenylenedialdehyde and 5',5''-bis(4-aminophenyl)-[1,1':3',1'':3'',1'''-tetraphenyl]-4,4'''-diamine via imine bonds. This invention achieves controllable and robust growth of a novel COF on the surface of an inert polymer membrane through a "polydopamine-mediated layer + aldehyde pre-anchoring" strategy. As a solid-phase extraction medium, the composite membrane exhibits excellent enrichment performance and good reusability for trace amounts of carbamate pesticides in food and environmental samples, and has significant application value in sample pretreatment.

This invention relates to a triazine-biphenyl dual-ligand hydrogen-bonded organic framework, a cathode probe, its preparation method, and its applications. The triazine-biphenyl dual-ligand hydrogen-bonded organic framework is formed by the self-assembly of 2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine and 4,4'-biphenyldicarboxylic acid through inter-carboxyl hydrogen bonds. The cathode probe is composed of the aforementioned triazine-biphenyl dual-ligand hydrogen-bonded organic framework linked to a target antibody. The cathode probe is used in immunosensors. This invention uses TCT and BPDC as dual ligands to construct a three-dimensional porous framework structure with a more regular pore structure and a longer excited-state lifetime, significantly improving electron transport efficiency and increasing ECL quantum yield by 3-6 times. The organic framework is activated by EDC / NHS and then covalently linked to a target antibody as a cathode luminescent probe; sandwich or competitive ECL immunosensors can be constructed.