TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Components: Hydrolytic enzyme is protease or amylase. Hydrolytic enzyme solution is protease solution or amylase solution. Preferred Processes: Immobilized hydrolase is obtained by dissolving chitosan in acetic acid solution to obtain chitosan solution, adding Fe3O4 nanoparticle and glutaraldehyde solution, ultrasonically oscillating at room temperature to react completely, magnetically separating, removing supernatant, washing obtained precipitate to neutralize, vacuum freeze-drying to obtain magnetic chitosan composite microsphere, adding glutaraldehyde solution, performing crosslinking reaction, oscillating at room temperature under water bath condition to react completely, washing obtained carrier product to neutralize, adding hydrolytic enzyme solution, oscillating at room temperature under water bath condition, washing with phosphoric acid buffer solution, and vacuum freeze-drying in which mass ratio Fe3O4 nanoparticle:chitosan:glutaraldehyde is 1:1:0.7:1.5, mass ratio magnetic chitosan composite microsphere:glutaraldehyde is 0.5-1:1, and mass ratio hydrolytic enzyme:carrier is 0.8-3:1. Protease solution is obtained by adding industrial grade protease into phosphoric acid buffer solution, stirring at 48-52?Doc to dissolve fully, centrifuging, and taking supernatant, and amylase solution is obtained by adding industrial grade amylase into phosphoric acid buffer solution, adding sodium chloride solution, stirring at 48-52 degrees C to dissolve fully, centrifuging, and taking supernatant.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Processes: The Fe3O4 nanoparticle is obtained by dropping iron salt solution into ammonia water until pH is 9.5-10.5, stirring at room temperature under nitrogen (N2) gas protection, aging at 78-82 degrees C for 30-40 minutes to obtain Fe3O4 suspension, cooling at room temperature, stirring, magnetically separating, removing supernatant, washing obtained precipitate with water until pH is 6.8-7.2, and vacuum freeze-drying for 24-48 hours. Preferred Compositions: Iron salt solution is mixed solution of ferric ion (Fe3+) and ferrous ion (Fe2+) with molar ratio of 1.6-2:1.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Parameters: Chitosan has concentration of 3-5 mg/ml, acetic acid has concentration of 1-1.5 mass%, and glutaraldehyde has concentration of 1-2 mass%.