Abstract: Disclosed are a modified epoxy resin immobilized enzyme, a preparation method therefor and an application thereof. Herein, the preparation method includes the following steps: modifying an epoxy resin, adding a polyethyleneimine to a modified epoxy resin for further modification, and then adding an enzyme to be immobilized and a glutaraldehyde for immobilization, to obtain the modified epoxy resin immobilized enzyme. The epoxy resin is modified, the polyethyleneimine is added to the modified epoxy resin for the further modification, and an aldehyde group in the resin and an amino group in the polyethyleneimine are covalently bound to each enzyme, then it is activated by the bifunctional reagent glutaraldehyde.

Abstract: Provided is an amination method for a polystyrene-type resin, and a method for immobilizing an enzyme using an aminated polystyrene-type resin. The amination method includes: in a solvent, a catalyst is used to catalyze a polystyrene-type resin and an enamine salt to perform a Friedel-Crafts alkylation reaction, to obtain an aminated polystyrene-type resin, herein the catalyst is a Lewis acid catalyst. By means of the Friedel-Crafts alkylation reaction, the enamine salt is grafted onto the polystyrene-type resin, and the polystyrene-type resin is aminated. The conditions of the Friedel-Crafts alkylation reaction are easy to control, the post-treatment process is simple, and it is only necessary to remove the catalyst and the unreacted enamine salt by washing. Therefore, the above amination method in the present application has few steps and is simple and easy to implement. Meanwhile, the amination method further avoids the use of a noble metal catalyst, thereby reducing production cost.

Abstract: The application provides an enzyme immobilization carrier and a preparation method thereof, an immobilized enzyme and a preparation method thereof. The above enzyme immobilization carrier is obtained by an amino modification or a cyanuric chloride modification of super-crosslinked polyvinyl alcohol. The use of the enzyme immobilization carrier provided by the application may effectively improve the stability and reusability of the immobilized enzyme. Moreover, due to the use of the form of enzyme covalent linkage, compared with an embedding method, the preparation method is no need for chemical reagent immersion and the like, it is beneficial to maintain the own activity of the enzyme, and promote the immobilized enzyme to have the better activity while the stability and reusability are kept.

Abstract: Described herein are a PVA membrane immobilized enzyme and a preparation method therefor. The PVA membrane immobilized enzyme includes a PVA porous membrane and an enzyme entrapped on the PVA porous membrane. The PVA porous membrane is a three-dimensional structured PVA porous membrane. The enzyme is any one selected from transaminase, D-lactate dehydrogenase, cyclohexanone monooxygenase, ketoreductase, alkene reductase, nitrilase, ammonia lyase, amino acid dehydrogenase, imine reductase, alcohol dehydrogenase, ammonium formate dehydrogenase, glucose 1-dehydrogenase and mutants thereof. The three-dimensional structured PVA porous membrane is used as a carrier to immobilize an enzyme in an entrapment manner. After entrapping and immobilizing the enzyme in the PVA porous membrane, the enzyme is stable, and cannot be easily leached out in the process of use. The PVA porous membrane is suitable for use in continuous flow biochemical catalysis, and has wide applicability to enzymes.

Abstract: Provided is an immobilized enzyme, a preparation method and use thereof. The immobilized enzyme includes an enzyme and an amino resin carrier for immobilizing the enzyme, and the enzyme is selected from any one of the following enzymes: transaminase, ketoreductase, monooxygenase, ammonia-lyase, ene reductase, imine reductase, amino acid dehydrogenase, and nitrilase. The amino resin carrier is an amino resin carrier modified by a cross-linking agent, and the cross-linking agent is a cross-linking agent treated by a polymer. By means of modifying the amino resin carrier with the cross-linking agent treated by the polymer, the enzyme immobilized on the amino resin carrier may easily form a network cross-linking, such that the immobilization effect of the enzyme is more stable, thereby the recycling efficiency of the enzyme is improved.

Abstract: Disclosed are a modified epoxy resin immobilized enzyme, a preparation method therefor and an application thereof. Herein, the preparation method includes the following steps: modifying an epoxy resin, adding a polyethyleneimine to a modified epoxy resin for further modification, and then adding an enzyme to be immobilized and a glutaraldehyde for immobilization, to obtain the modified epoxy resin immobilized enzyme. The epoxy resin is modified, the polyethyleneimine is added to the modified epoxy resin for the further modification, and an aldehyde group in the resin and an amino group in the polyethyleneimine are covalently bound to each enzyme, then it is activated by the bifunctional reagent glutaraldehyde.

Abstract: Described herein are an immobilized enzyme, and a preparation method therefor and a use thereof. The immobilized enzyme includes activated PEI and an enzyme covalently bonded to the activated PEI, where the enzyme is selected from any one of a transaminase, a ketoreductase, a monooxygenase, an ammonia lyase, an ene-reductase, an imine reductase, an amino acid dehydrogenase and a nitrilase.

Abstract: Provided are a co-immobilized enzyme, a preparation method and use thereof. The co-immobilized enzyme includes: an amino resin carrier, a main enzyme, and a coenzyme. The main enzyme and the coenzyme are co-immobilized on the amino resin carrier, herein the main enzyme is covalent-immobilized on the amino resin carrier, and the coenzyme is immobilized on the amino resin carrier by a mode of covalent and/or non-covalent; and the main enzyme is selected from any one of the following enzymes: transaminase, amino acid dehydrogenase, imine reductase, ketoreductase, enoyl reductase, and monooxygenase. The main enzyme and the coenzyme thereof are co-immobilized on the amino resin carrier for co-immobilization, so the activity and the recycling efficiency of the enzyme are improved.

Abstract: The invention provides a transaminase mutant and application thereof, wherein the amino acid sequence of the transaminase mutant is formed after mutation of the amino acid sequence as shown in SEQ ID NO: 1, and mutated amino acid sites comprise T7C+S47C sites. The transaminase mutant having the mutation sites can be further prepared into an immobilized enzyme through an immobilization technology, the immobilized enzyme has relatively high activity and high stability, can be recycled for multiple times, and is applicable to continuous flow reaction in a packed bed.

Abstract: The invention provides a transaminase mutant and application thereof, wherein the amino acid sequence of the transaminase mutant is formed after mutation of the amino acid sequence as shown in SEQ ID NO: 1, and mutated amino acid sites comprise T7C+S47C sites. The transaminase mutant having the mutation sites can be further prepared into an immobilized enzyme through an immobilization technology, the immobilized enzyme has relatively high activity and high stability, can be recycled for multiple times, and is applicable to continuous flow reaction in a packed bed.