Preparation method of metal catalyst material and application thereof in controllable degradation of polysaccharide

By using metal-organic framework materials to photocatalyze the conversion of water and oxygen into hydrogen peroxide, and combining this with a metal catalyst to catalyze the generation of hydroxyl radicals from hydrogen peroxide at low concentrations, the problems of low polysaccharide degradation efficiency and environmental pollution have been solved, achieving efficient degradation and enhanced bioactivity of polysaccharides.

CN118122384BActive Publication Date: 2026-08-07NANJING NORMAL UNIVERSITY
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Patent Information

Application Number
CN202410177132.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-02-08
Publication Date
2026-08-07
Estimated Expiration
2044-02-08

AI Technical Summary

Technical Problem

Existing polysaccharide degradation methods suffer from problems such as low efficiency, strong corrosiveness to equipment, serious environmental pollution, and high cost, making it difficult to effectively improve the bioactivity and bioavailability of polysaccharides.

Method used

Metal-organic frameworks (MOFs) are used as catalysts for artificial photosynthesis. Water and oxygen are converted into hydrogen peroxide through photocatalysis. Combined with metal catalysts, hydrogen peroxide is stably generated at low hydrogen peroxide concentrations to generate hydroxyl radicals, which attack glycosidic bonds, thus achieving efficient degradation of polysaccharides. By controlling the type and amount of metal catalysts, a series of uniform low molecular weight sugar chains with different molecular weights are obtained.

Benefits of technology

It achieves efficient degradation of polysaccharides under mild conditions, prevents polysaccharide desulfurization, obtains low molecular weight polysaccharides with clear structure and uniform molecular weight, reduces production costs, and the materials are reusable and environmentally friendly.

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Abstract

The application discloses a preparation method of a metal catalyst material and application of the metal catalyst material in controllable degradation of polysaccharides, and the preparation comprises the following steps: mixing and reacting a ligand material with a metal ion solution, solid-liquid separation, washing, and drying; grinding the dried solid into powder, and then high-temperature calcining to obtain a metal monatomic catalyst, namely the metal catalyst material; or uniformly mixing and grinding the obtained metal monatomic catalyst with a metal organic framework material, and then high-temperature calcining to obtain a composite metal catalyst material. The metal catalyst material prepared by the application can make up for the limitations of Fenton oxidation principle in degrading polysaccharides, such as large iron consumption, strong pollution, and difficult control, and can avoid the adverse effects caused by the corrosiveness of hydrogen peroxide in actual production and operation. Different molecular weight polysaccharides can be obtained by adjusting the proportion and dosage of the metal catalyst material, the method can prepare polysaccharides with different molecular weights, and the prepared polysaccharides have good uniformity.
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