148results about How to "Strong antibacterial activity" patented technology

The invention provides a silver-loaded low-molecular-weight chitosan composite microsphere antibacterial agent and a preparation method thereof. Low-molecular-weight chitosan is used as a raw material, and a low-molecular-weight chitosan acetic acid solution, a silver nitrate solution and a vanillic aldehyde ethanol solution are mixed to form composite sol; then paraffin is used as a continuous phase, sorbitan monooleate and alkylphenol ethoxylates are used as a compound emulsifier, a silver / low-molecular-weight chitosan sol is used as a monomer, and sodium tripolyphosphate is used as a cross-linking agent for preparing an emulsion system for emulsification crosslinking, and finally washing and drying are performed, so that the silver-loaded low-molecular-weight chitosan composite microsphere antibacterial agent is obtained. Due to the fact that the low-molecular-weight chitosan is used as the raw material, nanometer silver particles can enter microspheres, and the antibacterial activity of the composite antibacterial agent is obviously improved. The obtained antibacterial agent has the broad-spectrum bactericidal activity, and has the efficient fatality rate for both escherichia coli and staphylococcus aureus.

The present invention provides a safe and highly effective antibacterial composition without impairing the flavor of foods or drinks, which composition is used in products such as foods and oral care goods which are mainly to be taken into human or animal bodies or mainly to be used in the oral cavity. The composition according to the present invention contains gallocatechin gallate as an agent for enhancing the activity of antibacterial catechins in which the antibacterial activity of the antibacterial catechins against Streptococcus mutans is particularly enhanced. The composition according to the present invention can be produced by mixing the antibacterial catechins with gallocatechin gallate. Alternatively, it can be produced as a composition comprising a synthetic adsorbent-adsorbed fraction as the main component, which is obtained by subjecting a solvent-extract from tea leaves to an adsorption treatment with the use of a synthetic adsorbent selected from among aromatic compound-based synthetic adsorbents and methacrylic compound-based synthetic adsorbents.

The invention provides a method for preparing flamazine / bacterial cellulose composite wound dressing, which comprises the following steps of: performing pretreatment and purification treatment on a bacterial cellulose membrane to obtain purified bacterial cellulose; preparing flamazine suspension with the granularity of 50 to 5,000 nm under dark condition; reacting the bacterial cellulose membrane with the flamazine suspension to form a flamazine / bacterial cellulose composite membrane; and performing drying treatment to obtain a dry flamazine / bacterial cellulose composite membrane, or performing extruding dehydration to obtain a wet flamazine / bacterial cellulose composite membrane with different water content values to prepare the flamazine / bacterial cellulose composite wound dressing. The prepared flamazine / bacterial cellulose composite wound dressing has high mechanical performance, high antibacterial property, and high water and air permeability or good drainage and moisture absorption effects, can promote the drying, scabbing and healing of wound, and is used for preventing and treating the secondary wound infection of second-degree and third-degree burn or scald.

The invention discloses an antifouling and antibacterial coating paint, which is prepared by taking methanol as a solvent through carrying out quaterisation reaction on copolymers methoxy polyethylene glycol-b-poly(ethyl methacrylate) dimethyl sulfo-propane betaine-b-poly dimethylaminoethyl methacrylate and 3-triethoxysilane. The invention also discloses applications of the paint in preparing coatings on the surfaces of ships, marine engineering machineries and sewage treatment equipment so as to implement antifouling and antibacterial treatment. Experiments show that a polymer coating prepared by using the paint disclosed by the invention has excellent protein adsorption and microbial contamination resistance, and has lasting antifouling and antibacterial abilities, and therefore, the paint has a board market prospect, and has significant social and economic values.

The invention belongs to the field of plant tissue cultivation, and particularly relates to a method of cutting propagation of a peony immature stem. The method includes the steps of material selection, cutting cultivation, indoor management, oversummer maintenance, overwinter management and strong seedling cultivation. By using low-frequency ultrasonic waves to conduct processing, rooting can be promoted, plant cell division can be remarkably accelerated and induced, the cell growth is stimulated, protein synthesis of protoplast can be accelerated, and the adventitious bud reproducibility can be improved. Due to the fact that intermittent irradiation is adopted, no drastic cavitation effect can be produced, and partial damage to cells caused by the ultrasonic waves can be avoided. Due to the fact that cultivation and rooting are conducted in the dark cultivation process, growth inhibitor is greatly reduced, and rooting is facilitated. The complete and specific method including the steps of oversummer maintenance, auxiliary bud inducing, overwinter management and strong seedling cultication is provided, and therefore application of the peony rapid cutting propagation technology in actual production is promoted, and the method has significance in large-scale production of peony seedlings.

The present invention relates to a dead lactobacillus biomass for antimicrobial use; the biomass being produced by subjecting a lactobacillus fermentation liquid to tyndallisation and then separating the same into a fermentation filtrate and a biomass-containing liquid, subjecting the biomass-containing liquid to freeze drying, and subjecting the fermentation filtrate to either fluidised-bed drying or freeze drying, and then mixing the fermentation filtrate and the biomass resulting from the drying processing. The present invention also relate to a production method for the dead lactobacillus biomass. The dead lactobacillus biomass for antimicrobial use according to the present invention has the advantage that it has a uniform composition and exhibits outstanding antimicrobial activity. Consequently, the same can be used to advantage during the production of various medical products, foods, animal feeds and cosmetics where antimicrobial activity and a bowel-regulating action are required.

The invention relates to a method for preparing a biological polysaccharide self-assembly modificatory chitosan antibacterial biological material, which is characterized by comprising the following steps: (1) preparing a lentinan derivant, i.e. lentinan sulfate; (2) preparing a chitosan membrane base material; (3) preparing a lentinan sulfate solution and a chitosan solution; and (4) carrying outlayer-by-layer self-assembly of the lentinan sulfate and the chitosan on the surface of the base material: respectively carrying out alternative self-assembly on the chitosan membrane base material in the lentinan sulfate solution and the chitosan solution for 5 times to obtain a surface layer-by-layer self-assembly modificatory chitosan mebrane containing 5 bilayers with the outermost layer of the lentinan sulfate, washing and drying to obtain the biological polysaccharide self-assembly modificatory chitosan antibacterial biological material. The chitosan antibacterial biological material prepared by the method has excellent antibacterial activity; and the method has simple preparation process, easy control, mild preparation conditions and low cost.

The invention discloses a preparation method of a nano silver chloride / chitosan fiber anti-bacterial dressing. The method includes following steps: (1) pretreatment of a surface of a chitosan fiber nonwoven cloth: spraying an acid solution onto the surface of the chitosan fiber to enable the acid solution to infiltrate into the surface of the nonwoven cloth, treating the nonwoven cloth for 1-5 min and then washing the nonwoven cloth with deionized water; (2) soaking the pre-treated nonwoven cloth in a silver nitrate solution with a concentration of 0.0048-0.036 mmol / mL with a normal-temperature shaking operation for 30 min; (3) draining the nonwoven cloth and air-drying the nonwoven cloth until the water content is 30-40%; (4) uniformly spraying a 0.036-0.27 mmol / mL sodium chloride solution having an equal saturate water absorption amount onto the surface of the nonwoven cloth, wherein molar number of the sodium chloride is 1.2-1.5 times than that of adsorbed silver, and carrying out a reaction for 5-10 min; and (5) spraying deionized water and quickly washing the nonwoven cloth, draining the nonwoven cloth and vacuum-drying the nonwoven cloth at 50-60 DEG C. The preparation method is high in silver recycle ratio. A nano silver chloride anti-bacterial material is stable in physical and chemical performances, is excellent in anti-bacterial performance or bacteria-inhibiting peroformance, is good in fixation performance of silver chloride particles to the chitosan fiber, and can be used as a medical wound dressing.

The invention relates to the technical field of medicines, in particular to a twin antibiotic compound formed by bonding each two parent nucleuses with the same structure of a beta-lactam antibiotic compound or of a derivative of the beta-lactam antibiotic compound with a dicarboxylic acid by two amido bonds, preparation method thereof and use thereof. The chemical structural general formula of the twin antibiotic compound is represented by a formula III. In the formula, R3 is a parent nucleus structure of a molecule of a penicillin compound or a derivative of the penicillin compound or a molecule of a cephalosporin compound or a derivative of the cephalosporin compound; and R may be alkyl and aryl or heteroaryl or substituted alkyl and substituted aryl or heteroaryl. In-vitro antibacterial experiments show that the beta-lactam twin antibiotic compound of the invention has remarkable antibacterial activity and is a novel antibacterial compound. The beta-lactam twin antibiotic compound of the invention can be used in the preparation of bacteriostats or bacteriacides as well as anti-infection medicaments. According to the general knowledge of pharmacy, the compound of the invention can be made into pharmaceutically acceptable salts or hydrates.

The invention relates to a streptomyces antibacteria product and a method for manufacturing the same, belonging to the biotechnology field. GB-2 seeds of the streptomyces are proliferated and cultivated, then inoculated to undergo submerged ferment under 28 DEG C for 144-168 hours, then the fermentation liquor is filtrated, n-hexane and ethyl acetate is used for twice extractions to eliminate the lipid fat-soluble impurities, and then an ultrafiltration membrane is used to intercept the biological molecules with the molecular weight below 1,000, the filter liquor is made pass through a 1-2nm nanometer filtration membrane to obtain the antibacterial metabolic product. As proved by test, the antibacterial substance has the broad-spectrum antibacterial activity against bacteria and epiphyte, as well as the significant antibacterial activity against multiple pathogenic organisms and spoilage organisms. The antibacterial product provided by the invention has significant inhibitive effect on multiple pathogenic bacterium and moulds, thereby manifesting the efficient and broad-spectrum activity, simple method and low cost, with high applicable value and great prospect in the market in the respect of antiseptics, forage additives and medicine.

The invention provides a medical composition for killing bacteria and relieving itching and a preparation method of the same. The medical composition consists of oriental wormwood, wild chrysanthemum, coptis chinensis, cortex phellodendri, sophora flavescens, baical skullcap root, belvedere fruit, indigowoad leaf, pepper, radix stemonae, cortex dictamni, common cnidium fruit, liquorice and borneol. The medicament has the functions of killing bacteria and relieving itching and a good therapeutic effect on skin itches.

The invention relates to a botanical fungicide and the preparation method thereof, which relate to a fungicide and the preparation method. The invention solves the shortcomings of the existing fungicide in severe environmental pollution and resistance due to long-term use. The botanical fungicide of the invention is made from stellera chamaejasme, liquorice, aconite and radix sophorae falvescentis. The method of the invention comprises the steps of: 1. weighing and mixing the stellera chamaejasme, liquorice, aconite and radix sophorae falvescentis; 2. leaching the ethanol; 3. filtering; 4. distilling; 5. moist heat sterilization. The botanical fungicide of the invention has the advantages of innocuity, low residuals, small dosage, no pollution, no resistance, strong bacteriostatic activity, high selectivity, diversified raw material sources, easy match with other biological pesticides, etc. The method of the invention has the advantages of simple process, and low cost. Compared with the chemical agent, the Chinese herbal medicine fungicide has the advantages of many active sites, long agent duration, high degradation speed, small pollutions to the environments, etc.

A compound as represented by the general formula (I) shown below exhibits high antibacterial activity against gram-positive bacteria, in particular, such drug-resistant bacteria as mRNA, PRSP and VRE: wherein R1 is a methyl group, a fluoromethyl group, a methoxymethyl group, an acetoxymethyl group, a hydroxymethyl group or a methylene; R2 is a hydrogen atom, a lower alkyl group having 1 to 3 carbon atoms, or a pharmaceutically acceptable cation and an ester of a prodrug; R3 is a hydrogen atom or a halogen atom; R4 is a hydrogen atom, a lower alkyl group having 1 to 3 carbon atoms, a fluoromethyl group, a trifluoromethyl group or a fluorine atom; and R5 is a hydrogen atom or a fluorine atom, with exceptions where R1 is a methyl group, R4 and R5 are at the same time a hydrogen atom, and R3 is a fluorine atom.

The invention belongs to the technical field of self assembling of the biomedical material and the biomacromolecule, and particularly relates to a self-assembled modified polylactic acid material of lysozyme and mushroom polysaccharide sulfate and a preparation method thereof. The self-assembled modified polylactic acid material of the lysozyme and the mushroom polysaccharide sulfate comprises base material and a modification layer, wherein the base material comprises surface amination polylactic acid material; the modification layer is obtained by carrying out surface modification on the surface of the base material by the layer-by-layer self-assemble technology; and the modification layer contains the lysozyme and the mushroom polysaccharide sulfate which are self-assembled alternately layer by layer on the surface of the base material. The surface of the polylactic acid material prepared by the method has good antibacterial activity for inhibiting staphylococcus aureus and escherichia coli, and the blood compatibility of the surface of the material is improved. Meanwhile, the preparation method for the material has the advantages of simple technology, moderate preparation condition and low cost and is easy to control.

The invention provides an MXenes-AgNPs synergistic antibacterial cotton fabric. Through the synergistic antibacterial effect of MXenes and AgNPs, the cotton fabric has excellent antibacterial activity and lasting antibacterial ability. AgNPs are uniformly loaded on the surface of the MXene two-dimensional nanosheet through covalent interaction, so that the MXenes nanocomposite loaded with AgNPs is formed. The surface of the cotton fabric is uniformly coated with the AgNPs-loaded MXenes nano composite material through covalent interaction. In addition to the antibacterial property, the cotton fabric prepared by the invention further has multiple functions of ultraviolet resistance, electromagnetic radiation resistance, conductivity and the like, the additional value of the cotton fabric is greatly improved, and the application range of the cotton fabric is greatly widened.

The invention belongs to the field of biological materials and interdiscipline of polymer chemistry and biochemistry and discloses a gelatin / nano silver composite material decorated by microbial transglutaminase and a preparation method and an application thereof. The gelatin / nano silver composite material decorated by microbial transglutaminase is prepared by utilizing a gelatin / nano silver composite material as main material and utilizing the microbial transglutaminase as a modifier, the material has good biocompatibility, non-toxicity and strong antibacterial activity, the mechanical properties and water stability of the material are good, and meanwhile, the material is simple in preparation process, mild in reaction conditions, easy to control and low in production cost, thereby having good application prospect and very extensive usage in biomedical materials and biomedicine field, such as antibacterial and biodegradable skin dressing capable of reducing infection and inflammation and protecting wound, wound healing agent and artificial skin, and the like.

The invention discloses a preparation method of an anti-bacteria cotton fabric containing an AgO / TiO2 composite. The preparation method comprises the following steps of: mixing AgO powders and TiO2 powders, and then performing ball milling on the mixed powders in a ball mill to obtain AgO / TiO2 composite anti-bacteria powders; then weighing a surface active agent which is then put into a reactor, adding deionized water in the reactor, then heating the mixed liquid, stirring the mixed liquid to dissolve the surface active agent, then adding the ultrafine AgO / TiO2 composite anti-bacteria powders in the mixed liquid, stirring the liquid continuously, finally adding an adhesive into the liquid, and stirring the liquid to obtain AgO / TiO2 composite anti-bacteria finishing agent suspending liquid; and soaking, washing and drying a cotton fabric, heating and stirring the AgO / TiO2 composite anti-bacteria finishing agent suspending liquid, soaking the cotton fabric into the AgO / TiO2 composite anti-bacteria finishing agent suspending liquid, then washing the cotton fabric by tap water under a room temperature, and drying the cotton fabric to obtain the anti-bacteria fabric containing the AgO / TiO2 composite. The preparation method solves the problems that the conventional preparation method of anti-bacteria fabrics is complex, the sterilizing speed of the fabrics is slow, and the anti-bacteria capability of the fabrics is weak.

The invention discloses a method for preparing a shell-loaded nano-silver composite antibacterial material with the assistance of microwaves. The method comprises the steps that shell powder is pretreated; the shell powder is added to a silver nitrate solution, an additive is added to prepare a mixed solution, the mixed solution reacts in the microwave synthesis instrument, after the reaction is completed, deionized water washing is conducted, suction filtration and drying are conducted, and then the shell-loaded nano-silver composite antibacterial material can be obtained. By the adoption of the method for preparing the shell-loaded nano-silver composite antibacterial material with the assistance of the microwaves, shells are pretreated through an ultrasonic technique, impurities in a porous structure of the shells are removed, and the surfaces of the shells are activated. The method for preparing the shell-loaded nano-silver composite antibacterial material with the assistance of the microwaves has the advantages of shortening reaction time, improving productivity, preparing the material which is small in particle size, narrow and even in particle size distribution and high in purity, improving the physical-chemical properties of the material and the like; the reaction temperature is lowered, the reaction time is shortened, and the defect that by the adoption of a traditional method, a synthesized material is large in particle and prone to clustering is overcome; the antibacterial performance of the composite material is improved; the technology is simple, resource utilization of the wasted shells is achieved, waste materials are recycled, and cost is reduced.

The invention provides compounds with a general formula (I) or (II), and acceptable salts or esters prepared from the compounds and inorganic acid or organic acid. In the general formula (I) or (II), Ar refers to aromatic heterocyclic hydrocarbyl or substituted aromatic heterocyclic hydrocarbyl; and X refers to hydrogen or fluorine. The compounds have a novel structure; 9-oxime hydroxyl of ketolide is connected with an aromatic heterocyclic hydrocarbon through a propargyl side chain; and the compounds are easy and convenient to synthesize and are suitable for industrial production. Moreover, the compounds have outstanding antibacterial activity on clinically common sensitive bacteria and drugfast bacteria, such as staphylococcus aureus, streptococcus pneumonia, streptococcus pyogenes, staphylococcus epidermidis and the like, can be independently used or serve as one of active ingredients to be mixed with other medicines to treat bacterial infection and the like in various formulations or medication ways. Correspondingly, the invention also provides a preparation method for the compounds, use of the compounds as anti-infective agents and corresponding medicinal compositions.

The invention discloses a method of preparing EuB6 nano cubic crystal at low temperature. A liquid plasma technique and a solvothermal method are combined to successfully synthesize the EuB6 nano cubic crystal at the temperature of less than 100 DEG C. Compared with amikacin and kanamycin, the EuB6 nano cubic crystal has high antibacterial activity against particularly staphylococcus aureus. Compared with EuB6 nano cubic crystal prepared at high temperature, the EuB6 nano cubic crystal prepared at the low temperature has larger specific surface area and better antibacterial effect. It is expected that the EuB6 nano cubic crystal is applicable to medical instrument coatings, direct therapy of wounds or burns and the like.

The invention relates to an antibacterial peptide derivative from a forest frog and application thereof and belongs to the technical field of biochemical polypeptide medicines. The polypeptide is a small-molecule polypeptide which is designed artificially and synthesized chemically by taking a natural antimicrobial peptide from the skin secretion of a forest frog as a template. The polypeptide comprises 18 amino acid residues and has a sequence as shown in a sequence table. The molecular weight of the polypeptide is 2542.9Da, and the isoelectric point is 12.6. Experiments show that the small-molecule polypeptide has a broad-spectrum effect of killing a variety of bacteria and has no hemolytic activity in an antibacterial and anticancer concentration range, and the bacteria can not become resistant to the small-molecule polypeptide. In addition, Experiments on animals show that the polypeptide has the function of resisting wound infection. The polypeptide has a small molecular weight, can be synthesized artificially and conveniently, is a small-molecule polypeptide with quite high application value and can be used for preparing novel antimicrobial and antiinfectious medicines.

An ornidazole gargle for treating the non-general-infection oral diseases, such as periodontal disease, is prepared from ornidazole, menthol, rebaudiose, citric acid, polyethanediol 400, Tween-80 and water.

A broadspectrum efficient antimicrobial peptide Pb-CATH-OH1, a gene thereof, a preparing method of the peptide and applications of the peptide are disclosed. The antimicrobial peptide Pb-CATH-OH1 is a straight-chain polypeptide. The sequence of the antimicrobial peptide Pb-CATH-OH1 is as follows: lysine-arginine-phenylalanine-lysine-lysine-phenylalanine-phenylalanine-arginine-lysine-isoleucine-lysine-lysine-glycine-phenylalanine-arginine-lysine-isoleucine-phenylalanine-lysine-lysine-threonine-lysine-isoleucine-phenylalanine-isoleucine-glycine-glycine-threonine-isoleucine-proline-isoleucine. A precursor gene comprises 528 nucleotides, and nucleotides from the number 433 site to the number 525 site code the antimicrobial peptide. The antimicrobial peptide is rich in basic amino acids, low in molecular weight, simple in structure, extremely high in broadspectrum antimicrobial activity, low in hemolysis and not liable to generate drug resistance and has activity for gram-positive bacteria, gram-negative bacteria and fungi. The antimicrobial peptide can be used as an additive for preparation of medicines, cosmetics, foods, feed, and the like which are resistant to pathogenic microorganism infection.

The invention relates to a preparation method of a quaternary ammonium salt polyvinyl alcohol-cellulose-graphene oxide composite membrane. The preparation method comprises the following steps: dispersing cellulose nanocrystals (CNC) and graphene oxide (GO) into deionized water, and carrying out uniform ultrasonic dispersion to obtain composite dispersion liquid (CNC / GO) of the CNC and the GO; dissolving polyvinyl alcohol (PVA) into deionized water at the temperature of 90 DEG C by stirring, adding the CNC / GO dispersion liquid, evenly stirring and then pouring into a glass mould to form a membrane; immersing the PVA / CNC / GO composite membrane into an ethanol / aqueous solution which contains quaternary ammonium salt (DMAEMA-OB), a photocrosslinking agent (ethylene glycol dimethyl acrylate (EGDMA)) and a photoinitiator 2959 for 3h, and enabling the quaternary ammonium salt to be subjected to cross-linking reaction under the radiation of ultraviolet light for fixing the quaternary ammonium salt into a PVA matrix so as to obtain the quaternary ammonium salt polyvinyl alcohol / cellulose / graphene oxide composite membrane. The composite membrane has excellent water resistance, mechanical properties and thermal stability, thus being possibly applied to the field of active package.

The invention discloses silver-iodide-doped bioactive glass as well as a preparation method and an application of the silver-iodide-doped bioactive glass. The weight ratio of the silver iodide of silver-iodide-doped bioactive glass to the silver iodide of non-silver-iodide-doped bioactive glass is (90-100) to (1-10). The preparation method comprises the following steps of: weighing silver nitrate, potassium iodide and iodine according to a weight ratio of AgI; adding the non-silver-iodide-doped bioactive glass into absolute ethanol, ultrasonically processing, and fully dispersing; adding silver nitrate at first and then adding potassium iodide and iodine; uniformly ultrasonically stirring, centrifuging, filtering, washing deposits by de-ionized water, carrying out freeze drying, grinding, and sieving to obtain the silver-iodide-doped bioactive glass. The silver-iodide-doped bioactive glass is applied to preparation of drugs for preventing and treating various diseases. The silver-iodide-doped bioactive glass can be used for effectively promoting healing of human hard and soft tissue injury and inhibiting / killing bacteria, contains bioactive glass particles and silver iodide crystals, and is convenient to store, carry and use.

The invention discloses a settling method for a long-acting washable natural antibacterial fabric. The method comprises the following steps: (1) padding the fabric in an antibacterial essential oil liposome suspension, soaking for two times and padding for two times; (2) treating the fabric acquired in the step (1) with ultraviolet radiation under the condition of oxygen partial pressure at 0.5-0.8 Pa, wherein the scope of ultraviolet wavelength is 200-400nm, the radiation time is 30-60s, and the strength of ultraviolet radiation on the fabric surface is 80-100mW / cm<2>; and (3) adopting a natural cross-linking agent for cross-linking the fabric treated in the step (2), washing with water and then drying. According to the method disclosed by the invention, the natural antibacterial settling agent and auxiliaries are adopted, so that the use of compound chemicals is greatly reduced, the settling method is more environment-friendly, the biocompatibility of the fabric products is better, the volatility and release property of essential oil are greatly reduced, the fastness to washing and the tearing strength of the fabric are increased, and the antibacterial function of the fabric is enhanced.

The invention relates to application of a multifunctional plant-source bactericide to control iris tectorum gray mold. The plant-source bactericide is prepared from the following compositions in parts by weight: 0.5-2 parts of radix stellerae chamaejasmes, 3-5 parts of artemisia carvifolia, 0.7-2 parts of artemisia annua, 0.3-1 part of cinnamomum camphora, 1-3 parts of tobacco leaf, 0.8-1.6 parts of glycyrrhiza uralensis, 1-3 parts of fruit of Chinese sumac, 3-5 parts of galla chinensis, 0.5-2 parts of radix sophorae flavescentis, and 0.2-0.6 part of a synergist. The plant-source bactericide has the advantages of no toxicity, low residue, no pollution, no drug resistance, relatively strong bacteriostatic activity, high selectivity and wide raw material source.

The invention discloses an antibacterial protective environment-friendly composite polymer material and a preparation method and application thereof, wherein the composite polymer material comprises the following components by weight: 20 parts to 30 parts of benzyl quaternary ammonium salt, 50 parts to 75 parts of a biocompatible high-molecular polymer, 15 parts to 30 parts of modified nano metaloxide, 10 parts to 20 parts of nano metal particles, 30 parts to 40 parts of modified fiber, 25 parts to 45 parts of trisilanol ethyl ester silsesquioxane, 5 parts to 10 parts of a silane coupling agent, 3 parts to 5 parts of ammonium persulfate, 3 parts to 5 parts of dimethyl carbonate, 8 parts to 15 parts of 3-mercaptopropyl trimethoxy silane, and 2 parts to 3 parts of allyl glycidyl ether. Thematerial is capable of blocking and self-cleaning apatter or air with viruses, bacteria or microorganisms, is antibacterial, capable of killing viruses, capable of being repeatedly used, good in shrinkage resistance, high in elastic property and easy to degrade, and can be used for manufacturing window cloth, air conditioners, air purifiers, screen windows, clothes, trousers and masks.

The invention discloses a para aminobenzoyl chitosan and a preparing method thereof. The structure is disclosed as shown on the right, wherein, n is 160-180; after para aminobenzoyl structure is led in on a chitosan molecular chain, the minimal inhibitory concentration of the compound to colibacillus, staphylococcus aureus and aspergillus niger is respectively 0.1%, 0.1% and 1%. The compound has the following physical and chemical indexes: the compound is a pale yellow powder solid, can be dissolved in water and glycol and has the molecular weight of 45-50KD. Para aminobenzoyl chitosan strengthens the antibacterial activity of the chitosan, enlarges the antibiosis range of the chitosan, has favourable antibacterial activity for colibacillus, staphylococcus aureus and aspergillus niger andcan be applied as an antibacterial anticorrosive additive when preparing food.

The present invention relates to a method including reacting a solution of a salt of a biocidal metal with an active layer of water purification membrane, discarding the biocidal metal salt solution such that a thin layer of the biocidal metal salt solution remains on the membrane surface, reacting a reducing agent solution with the active layer of the membrane and the thin layer of the biocidal metal salt solution thereby forming a biocidal metal nanoparticle-modified membrane, removing the reducing agent solution, and rinsing the biocidal metal nanoparticle-modified membrane.