Method for loading silver nano-particles on cellulose-containing material

The invention discloses a moist antibacterial hydrogel dressing for curing diabetic foot ulcer, and relates to the technical field of medical instruments and preparation thereof The dressing is prepared by the following steps: dissolving ionic compounds in sodium alga acid water solution, and obtaining nano-silver sodium alga acid solution through adding reducing agent; adopting the impregnation method, placing the nano-silver sodium alga acid solution in a bacterial cellulose membrane, so as to obtain bacterial cellulose/nano-silver sodium alga acid composite membrane through freeze drying; and immersing the composite membrane in calcium chloride water solution, and obtaining the moist antibacterial hydrogel dressing for curing diabetic foot ulcer The dressing is a composite hydrogel membrane including bacterial cellulose hydrogel and nano-silver contained calcium alginatehydrogel The preparation is convenient to operate and low in cost, and the moist antibacterial hydrogel dressing prepared for curing diabetic foot ulcer has the performances of sterilizing, preserving moisture, absorbing wound percolate, quickening wound healing and the like, and is applied to curing wound traumas of diabetic foot ulcer, venous ulcer, pressure sores and donor site wounds at the lower limbs

Moist antibacterial hydrogel dressing for curing diabetic foot ulcer

The invention provides a preparation method of a novel high performance antibacterial nano-cellulose carbon aerogel The method includes: pretreating a cellulose membrane, preparing nano-silver compounded bacterial cellulose by an in-situ reduction method, placing the nano-silver compounded bacterial cellulose in liquid nitrogen to perform freeze drying so as to obtain nano-silver compounded bacterial cellulose aerogel, and in an aseptic heat treatment furnace, conducting heating and heat preservation to realize cellulose carbonization, thus finally obtaining the nanocarbon aerogel antibacterial composite material The nanocarbon aerogel antibacterial composite material provided by the invention improves the mechanical properties and release stability of nanocarbon aerogel, makes the nanocarbon aerogel fully satisfy all the performance requirements of antibacterial materials, the preparation cost is low, and the prepared samples have easily controllable shape and size, and also have good biocompatibility The composite material can be used in common antibacterial dressings, and also can be used for implants, drug release and other related biomedical fields

Preparation method of novel high performance antibacterial nano-cellulose carbon aerogel

The invention relates to a method for loading antibacterial nanometer silver by the selectivity of bacteria cellulose, and especially relates to a method for oxidizing a bacteria cellulose C6 site primary hydroxyl to carboxylic acid, aminating and loading the antibacterial nanometer silver. The method comprises the following steps: (1) placing bacteria cellulose which is frozen and dried into a nitroxyl/enzyme system solution, adding an oxidizing agent to react; (2) placing into a diamines substance solution to heat for reacting; (3) then dipping in a silver nitrate solution, generating a chelation by silver ions and amino to obtain the bacteria cellulose containing silver ions loaded by selectivity; or high pressure reducing the bacteria cellulose containing silver ions loaded by selectivity to obtain the bacteria cellulose which selectively loads nanometer silver particles. The method for loading antibacterial nanometer silver by the selectivity of bacteria cellulose is capable of loading the antibacterial nanometer silver on the bacteria cellulose C6 site hydroxyl, so that the combination of the silver ions or nanometer silver particles and bacteria cellulose is firm and difficult to shed.

Method for loading antibacterial nanometer silver by the selectivity of bacteria cellulose

The invention discloses a bacterial cellulose compound cuprous oxide antimicrobial dressing and a preparation method thereof. The bacterial cellulose compound cuprous oxide antimicrobial dressing lies in that cuprous oxide particles are adhered into a three-dimensional porous network structure of a bacterial cellulose hydrogel film, the cuprous oxide particles are of octahedral crystal forms, and the antimicrobial dressing is obtained by soaking a bacterial cellulose hydrogel film containing a glucose solution into a NaOH water solution and copper ion water solution mixed solution and heating and pressurizing for reaction. The bacterial cellulose compound cuprous oxide antimicrobial dressing is simple and convenient in preparation process and low in cost, has not only excellent bacteria resistance but also the advantages of high water content, good air permeability, excellent degradation property, no cytotoxicity and the like, and can well meet the demand of wet-process treatment for various wounds.

Bacterial cellulose compound cuprous oxide antimicrobial dressing and preparation method thereof

The invention discloses a method for preparing an Ag-carrying bacterial cellulose hydrogel antimicrobial dressing and a product thereof. The method comprises the following steps of: soaking a bacterial cellulose hydrogel film in solution of silver metal precursor; then heating the film to be between 121 and 135 DEG C in a high-pressure sterilizing pot, and pressurizing between 0.205 and 0.313MPa; standing bacterial cellulose for 5 to 30min; and then taking the treated bacterial cellulose out for washing, partial dehydration, packaging and sterilization to obtain an Ag-carrying bacterial cellulose hydrogel antimicrobial dressing which is formed by compounding silver metal nano-particles and bacterial cellulose and is attached with 0.01 to 10 weight percent of the silver metal nano-particles in a bacterial cellulose three-dimensional porous network structure. The preparation process of the invention has the advantages of simplicity, easiness, convenient operation, controllable preparation technology, no pollution and low cost; and the prepared nano-particles have the advantages of high purity, small particle size, uniform size and good dispersity. The obtained Ag-carrying bacterial cellulose hydrogel antimicrobial dressing has the characteristics of good antimicrobial property, high water content, good water-retaining property, strong toughness, good air permeability and the like, and can meet the requirements of treating various wounds by a wet method.

Method for preparing Ag-carrying bacterial cellulose hydrogel antimicrobial dressing and product thereof

The invention relates to a novel polyester chain extender and a preparation method thereof. The related novel polyester chain extender can obviously improve the intrinsic viscosity of the polyester and can reduce carboxyl content in the system. The novel polyester chain extender respectively comprises o-(4,4-dimethyl oxazoline) and a butanimide structure at the ortho position of the benzene ring, wherein the imide structure can react with hydroxide radical in the polyester and can obviously improve the intrinsic viscosity of the polyester; and oxazoline can perform the chain extending reaction with carboxyl in the polyester and can reduce the carboxyl content in the system when improving the viscosity. The preparation method for the novel polyester chain extender comprises the following steps: (a) dissolving isatoic anhydride and 2-alkamine in chlorobenzene and adding a catalyst into the mixture to perform a reaction to prepare oxazoline aniline; (b) dissolving the prepared oxazoline aniline in aether, adding succinic anhydride into the mixture to perform a reaction and filtering the reaction solution to obtain an intermediate; and (c) uniformly mixing the intermediate and anhydrous zinc chloride with kieselguhr, carrying out irradiation heating on the mixture by microwave, cooling the obtained product, adding ethyl acetate into the cooled obtained product to dissolve out the product, removing the solvent and crystallizing to obtain the novel polyester chain extender.

Novel polyester chain extender and preparation method thereof

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Method for preparing Ag-carrying bacterial cellulose hydrogel antimicrobial dressing and product thereof

Novel polyester chain extender and preparation method thereof