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 silver nanoparticle-containing bacterial cellulose membrane and a preparation method thereof. Silver nanoparticles in the bacterial cellulose membrane are attached to the microfiber surface of a three-dimensional network structure of the bacterial cellulose membrane, and the silver nanoparticles are in an amount which is 0.1 to 15 percent of the total weight of the cellulose membrane and have the particle size of between 8 and 50nm. The preparation method comprises the following steps of: soaking the bacterial cellulose membrane in silver salt solution at room temperature for 10 minutes to 5 hours and taking the soaked membrane out; cleaning the surface of the bacterial cellulose membrane by using distilled water; irradiating by an ultraviolet radiation method for 0.5 to 6 hours to obtain a silver nanoparticle-containing bacterial cellulose wet membrane; and performing dehydration treatment to obtain the silver nanoparticle-containing bacterial cellulose membrane. The bacterial cellulose membrane has high bacteria resistance, high air permeability, high water-holding capacity and controllable moisture content and is suitable to be used as a trauma medical dressing; and in the invention, a chemical reduction reagent is not required to be added, an environment-friendly and safe process condition is realized, and equipment is simple and pollution-free.

Silver nanoparticle-containing bacterial cellulose membrane and preparation method thereof

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 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 particularly relates to a method for preparing metal nanoparticle composite bacterial cellulose and products thereof, and belongs to the composite field of metallic nanomaterials and biopolymer materials. The method comprises the following steps: soaking the bacterial cellulose into solution of metal precursor; then, heating the solution in a high-pressure vessel to 121 to 150 DEG C, pressurizing the solution to 0.205 and 0.476MPa, and standing the solution for 5 to 30 minutes; and taking the treated bacterial cellulose out for washing and drying to obtain the metal nanoparticlecomposite bacterial cellulose attached with 0.01 to 10 weight percent of metal nanoparticles in a bacterial cellulose three-dimensional porous network structure, which is compounded by the metal nanoparticles and the bacterial cellulose. The method has simple and easy preparation process, convenient operation, controllable preparation technology, no pollution and low cost; the prepared nanoparticles have high purity, small diameter of nanoparticles, uniform size and good dispersibility; and the method realizes controllable preparation of sizes and distribution of the nanoparticles by simply changing experiment conditions, and has wide application value in the field of industrialized production.

Method for preparing metal nanoparticle composite bacterial cellulose and products thereof

The invention discloses a novel gluconacetobacter xylinus cellulose hydrogel dressing and a manufacturing method thereof. The hydrogel dressing comprises natural high polymer gluconacetobacter xylinus cellulose, and is additionally compounded with water-soluble chitin derivative with antibacterial and bacteriostatic properties; and water-soluble medicine can be added into the hydrogel dressing. The hydrogel dressing contains no additive, has good functions of antibacterium, diminishing inflammation, stopping bleeding, promoting wound healing and the like, and has the characteristics of high water content, good water-retaining property, strong toughness and good air permeability, thus meeting the requirement for treating various wounds by a wet method and being used for treating burn and scald, bedsore and surgery infection.

Novel gluconacetobacter xylinus cellulose hydrogel dressing and manufacturing method thereof

The invention relates to polyethylene glycol magnesium and a preparation method and application thereof The chemical structure of the polyethylene glycol magnesium is shown in the specification The preparation method for the polyethylene glycol magnesium comprises the following steps of: mixing polyethylene glycol and magnesium, heating and carrying out a reaction on the mixture, and continuously removing steam produced during the reaction to promote the generation of products; and removing residual water and residual polyethylene glycol from a reactant solution by using a vacuum pressure-reduction distillation process, taking a final product out and cooling, crystallizing at room temperature and leaching, washing and drying, and finally obtaining white crystalline particles which are the polyethylene glycol magnesium A polyethylene terephthalate (PET) nucleating agent is provided, and is smelted and mixed with PET during squeezing of a screw, so that the flexibility of a PET chain section is improved, and the glass transition temperature and the cold crystallization temperature of the PET are reduced; furthermore, the dispersion activation capacity of the PET chain section is reduced, so that the PET chain section does dispersive motion towards the surface of a crystal nucleus, and is arranged neatly; and therefore, a function of accelerating the PET crystallization rate is realized

Polyethylene glycol magnesium and preparation method and application thereof

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

Method for preparing metal nanoparticle composite bacterial cellulose and products thereof

Novel gluconacetobacter xylinus cellulose hydrogel dressing and manufacturing method thereof

Polyethylene glycol magnesium and preparation method and application thereof