3results about How to "Improve application features" patented technology

This invention discloses a method for reducing the viscosity of potato starch, belonging to the fields of enzyme engineering and biomodified starch technology. This invention provides a method for preparing macrocyclodextrin by reacting starch with 4-α-glycosyltransferase, which is then added to potato starch to provide a suitable substrate for subsequent starch processing. This application in starch processing offers a new approach and has great potential and application prospects.

The invention belongs to the technical field of lithium ion batteries, and relates to a cyano electrolyte additive, an electrolyte and a lithium ion battery. The cyano electrolyte additive comprises a nitrile additive and a functional additive; the structural formula of the functional additive is shown in the specification. The nitrile additive and the functional additive are compounded, the functional additive has a cyano group and a triazine ring, the triazine ring is chelated with transition metal ions and cooperates with the cyano group to form a film, and a benzene ring rigid structure can enhance the thermal stability. The nitrile additive and the functional additive have a cyano complementation effect, three phenyl groups in the functional additive are connected with a triazine ring, so that the functional additive has a larger structure and steric hindrance and cannot be completely complexed with transition metal ions on the surface of the positive electrode, and the short-chain nitrile additive has a smaller structure and can make up the space of the functional additive; and the two synergistically form a complementary effect to form a compact interfacial film on the surface of the positive electrode so as to improve the high-temperature performance.

The invention discloses a phenylalanine ammonialyase mutant and application thereof, and belongs to the technical field of bioengineering. The technical problems that existing natural phenylalanine ammonialyase is poor in thermal stability and limited in catalytic efficiency and has cross catalytic activity are solved. According to the mutant provided by the invention, 73rd-site serine of an amino acid sequence as shown in SEQ ID NO: 1 is substituted into asparagine, 84th-site phenylalanine is substituted into tyrosine, 90th-site valine is substituted into arginine or 95th-site glutamic acid is substituted into valine, or conservative substitution derivation is carried out on the basis, so that the mutant is obtained. Therefore, the phenylalanine ammonialyase mutant with significantly improved catalytic efficiency and thermal stability and strict substrate specificity is obtained. The mutant is mainly used for efficiently removing phenylalanine in protein raw materials, and has important application value in preparation of low-phenylalanine formula food for special medical purposes and related health care products suitable for phenylketonuria patients.