45results about How to "Strong specificity recognition ability" patented technology

The invention relates to a conductive type sensing electrode for detecting chloramphenicol in the field of biosensors and a method for preparing a molecular engram membrane of the chloramphenicol. In the invention, the conductive type sensing electrode is formed by arranging two screen painting electrodes in parallel. The method for preparing the molecular engram membrane of the chloramphenicol comprises the following steps: template molecules are embedded in a direct in-situ polymerization process of polymer fluid on the surfaces of the disposable screen painting electrodes, and then the template molecules are eluted so that cavities with set sizes and shapes and functional groups in confirmed arrangement are formed in the molecular engram membrane and have memorability to stereoscopic structures of the template molecules. Chloramphenicol molecules in a sample to be detected can be combined with the specificity of the cavities so as to change the electrochemical properties of the molecular engram membrane, and increase the conductivity and the membrane conductance of the molecular engram membrane. The processing method of the invention has simplicity, convenience and low cost, and the conductive type sensing electrode made of the screen painting electrodes has convenient operation, high response time and long service life when used for detecting the chloramphenicol.

The invention belongs to the field of molecular imprinting sensor field, and more specifically relates to a method used for photocatalysis RAFT polymerization preparation of a molecular imprinting sensor. The method mainly comprises following steps: a compound containing a tertiary amine structure is taken as a template molecule, and a template molecule-functional monomer pre-polymerized solutionis synthesized; tris (bipyridine) ruthenium is taken as both as a photocatalyst and an electrochemiluminescence agent, photocatalysis RAFT polymerization is carried out, and synthesis of a molecular imprinting polymer with a structure and a size similar to those of the template molecule is realized; and at last, a molecular imprinting sensor is obtained. The molecular imprinting sensor is high inspecific identifying capacity, can be used for quantitative determination, and the lowest detection lower limit concentration reaches 1*10<-13>mol / L. According to the preparation method, no extra polymerization initiator is needed, the process is more simple, is high in efficiency, is green, and is friendly to the environment.

The invention provides application of a cholesterol molecule imprinted membrane sensing electrode in detecting cholesterol content in blood. Specific steps in the method are as follows: (1) treating a blood sample, that is, standing the blood sample at room temperature and carrying out centrifugation to extract serum if the blood sample is obtained by drawing blood from a person who is on an empty stomach, or carrying out anticoagulation by using heparin or EDTA (ethylene diamine tetraacetic acid) if the blood sample is blood plasma; (2) dropwise adding the blood sample obtained in step (1) onto the cholesterol molecule imprinted membrane sensing electrode, inserting the cholesterol molecule imprinted membrane sensing electrode into an amperometric sensor for determination, and recording readings. When used for detecting cholesterol content in blood, the molecule imprinted membrane sensing electrode has the advantages of low cost, high sensitivity, fast analysis speed, capacity of reducing sampling amount and avoiding tedious pretreatment of blood samples, etc.