381 results about "Bacterial inhibition" patented technology

The present invention provides a food preservation system that includes a multi-phase bacterial inhibition food pad. The food pad includes absorbent media and / or material to absorb fluids emanating from the packaged food. The absorbent media / material includes one or more bacterial inhibitors that may possess bacteriostatic and / or bactericidal properties. In addition, the food pad may also include an atmosphere modification system capable of modifying an atmosphere in a food package. Optionally, one or more reaction promoters and / or one or more mechanisms to protect the food preservation system may also be included in the food pad. Overall, the food preservation system inhibits bacterial growth, thereby enhancing food preservation and / or food safety.

The invention relates to a water-soluble chitosan quaternary ammonium salt antibiotic finishing agent. The invention is characterized in that the antibiotic finishing agent is names as O-methacrylamide-N-hydroxypropyl alkyl dimethyl ammonium chloride chitosan and the concrete structural formula is as follows. The preparation thereof includes that: alkyl dimethyl tertiary amide and epichlorohydrin are taken as raw materials to synthesize 2, 3-epoxy alkyl dimethyl ammonium chloride, then the 2, 3-epoxy alkyl dimethyl ammonium chloride is introduce onto the ammonium group of chitosan, so as to obtain N-hydroxypropyl alkyl dimethyl ammonium chloride chitosan HDCC, and then crosslinking is carried out on the HDCC and hydroxymethyl acrylamide is carried out, thus obtaining NMA-HDCC. The quaternary ammonium salt antibiotic finishing agent contains water-soluble group and fibrous reactivity group and has good water solubility, the bacterial inhibition rate of finished cotton fabrics is close to 100%, and the finishing agent can be combined with cellulose fiber by covalent bond and is wash-resistant; and cost is low, raw material is environmental friendly, environmental pollution is less, thus having industrialization application prospect.

The present invention provides an efficient antibacterial chitosan essential oil microcapsule preparation method, which comprises chitosan aqueous solution preparing, polyvinyl alcohol aqueous solution preparing, core material emulsion preparing, and efficient antibacterial chitosan essential oil microcapsule preparing so as to obtain the efficient antibacterial chitosan essential oil microcapsules. According to the present invention, the method has characteristics of safety and environmental protection, and the used raw materials are the natural products; and the product microcapsules are cationic, have characteristics of efficient antibacterial effect, high essential oil content and good slow release property, and can be directly used for fabric post-finishing and related function nursing products, and the bacterial inhibition rate of the obtained fabric on Staphylococcus and escherichia coli is up to 85%.

The present invention provides peppermint composite cellulose fibers, which contain 1-12 wt% of a peppermint extract component and 0.5-3 wt% of peppermint odor essential oil slow-release microcapsules, wherein the dry breaking strength of the fibers is 1.0-3.0 cN / dtex, the wet breaking strength of the fibers is 0.8-1.6 cN / dtex, the dry elongation at break is 16-24%, the residual sulfur content is less than or equal to 18 mg / 100 g, the antibacterial activity logarithm value is more than 2.0, and the bactericidal activity logarithm value is more than 0. The peppermint composite cellulose fiber preparation method comprises: peppermint extract adding liquid preparation, degenerated viscose glue preparing, peppermint blending viscose glue preparing, spinning and post-treating, and filament drafting and post-treating so as to obtain the peppermint composite cellulose fibers. The peppermint composite cellulose fibers of the present invention have characteristics of good wearability, textile processability, antibacterial function, bacterial inhibition function, lasting and fresh peppermint aroma, lasting odor, good textile processing performance, and significant antibacterial function.

A novel probiotic strain termed Lactobacillus pentosus NCIMB 41114 is capable of preventing growth of pathogenic microorganisms in the GI tract. In particular, this bacterium inhibits Candida overgrowth, and can be employed to prevent and treat associated diseases, including IBS and thrush.

The invention belongs to the technical field of veterinary microbial additive preparation, and specifically relates to a strain of separated and screened Enterococcus faecium providing significant bacterial inhibition effects for common enteropathogenic bacteria such as staphylococcus aureus, escherichia coli and salmonella in breeding animals, and an application thereof. The probiotic Enterococcus faecium of the present invention is characterized in that: the strain is Enterococcus faecium HDRsEf1, and is preserved in the China General Microbiological Culture Collection Center (CGMCC), and the preservation number is CCTCC NO:M2011031. The probiotic Enterococcus faecium of the present invention has characteristics of fast growth, high acid production capacity, strong stress resistance, safety, disease resistance and growth promotion, and can be used as the microbial feed additive for livestock and poultry feeds.

The invention discloses a high-yield strain streptomyces lydicus, as well as breeding and fermentation thereof. The fermentation of the high-wield stain streptomyces lydicus E9 CGMCC No.3075 comprises the following steps: (1) preparation of a shake flask, seeds and a fermentation medium; (2) shake flask culture; (2) seed culture; (4) fermentation pot culture: leading a seed culture liquid in a fermentation pot filled with the fermentation medium and culturing for 24-96 hours to obtain a high-wield stain streptomyces lydicus E9 fermentation liquor under the condition of ventilating, stirring, temperature of 25-35 DEG C, and pH of 4-9; and carrying out ultrasonication for 20-40 min. The strain of the invention can generate large quantity of substances with antimycotic activity in the fermentation liquor, and the fermentation liquor has evident inhibiting effect on rhizoctonia solani; and the bacterial inhibition rate of the fermentation liquor which is diluted by 50 times reaches above 97.8% after 48 hour fermentation.

The invention discloses a polyose nanometer material possessing antibiotic function and preparing method and application, which comprises the following steps: choosing water-soluble polyose material incorporating carboxy group or sulfonic group as basis material; loading metallic ion possessing bacterial inhibition active in water solution; setting metallic ion load capacity at 10-500mg / g and bacterial inhibition active at 99.9%; centrifugal separating; ultrasonic dispersing; freezing or spraying; drying; getting end product with particle diameter at 20-800nm. This invention can be used to textile industry, animal husbandry and medicine domain as antiviral drug.

The invention discloses a method for preparing a nanofibre membrane, belonging to a technique for preparing a nanofibre compound membrane. The method comprises the following steps: preparing curcuminethanol solution and chitosan acetum, mixing the curcumin ethanol solution and the chitosan acetum by the volume ratio thereof to prepare spinning solution which is injected into an injector of an electrostatic spinning device for electrostatic spinning to form a compound nanofibre membrane and to obtain a curcumin / chitosan nanofibre membrane of antibacterial property, wherein the diameter of thecurcumin / chitosan nanofibre membrane is 200-400 nm. The invention has the advantages that the preparation process is simple, the prepared membrane material heals wound, has broad spectrum bactericidalproperty and has higher bacterial inhibition rate to colibacillus and staphylococcus aureus for 24h.

The invention discloses a nano-silver porous silicone rubber / polyurethane-containing double-layer artificial skin and a preparation method thereof. The nano-silver porous silicone rubber / polyurethane-containing double-layer artificial skin is characterized in that the artificial skin contains a dermis and epidermis double-layer structure; a dermis layer is prepared from loose porous polyurethane; an epidermis layer is prepared from antibacterial agent-containing silicone rubber. A preparation method of the dermis layer comprises the following steps: dissolving the polyurethane, adding a pore-foaming agent, defoaming, carrying out curtain coating so as to form a film, volatilizing a solvent, soaking so as to leach out the pore-foaming agent, and drying so as to obtain a porous polyurethane film. A preparation method of the epidermis layer comprises the following steps: dissolving a silicone rubber precursor, carrying out ultrasonic dispersion on a nano-silver solution, adding the pore-foaming agent, defoaming, carrying out blade coating or curtain coating so as to form a film, volatilizing a solvent, curing so as to obtain an embryonic film, soaking so as to leach out the pore-foaming agent, and drying so as to obtain a silicone rubber microporous film. The preparation method of the double-layer artificial skin comprises the following steps: coating the polyurethane film with polyvinyl alcohol, acid liquor and a crosslinking agent, then covering the polyurethane film by using the silicone rubber film, volatilizing a solvent, and carrying out heat treatment so as to obtain the double-layer artificial skin. The nano-silver porous silicone rubber / polyurethane-containing double-layer artificial skin has the effects of water resistance, air permeability, bacterial inhibition, virus killing and effective absorption of hydrops.

The present invention discloses a graphene-modified building coating material, which comprises a solvent, a commonly used additive and a main film forming substance, and further comprises graphene for modification, wherein the amount of the added graphene is 0.001-20% of the weight of the building coating material, the building coating material can further be added with the auxiliary additive, and the amount of the added auxiliary additive is 0-8% of the weight of the building coating material. According to the present invention, graphene is added to the existing building coating material so as to modify the water resistance mechanical strength of the building coating material and increase adhesion of the building coating material and the substrate, the contrast ratio and the scrubbing resistance; the bamboo carbon fibers are added to the building coating material so as to provide effects of bacterial inhibition, antibacterial and anti-ultraviolet light, such that the building coating material has the characteristic of green environmental protection; and the bone glue is added to the building coating material so as to improve bonding property and increase adhesion.

The invention provides a manufacturing method of a high-whiteness bamboo-charcoal viscose fiber, which comprises the following steps: soaking the raw materials mainly comprising bamboo chemical fiber pulp, squeezing, pulverizing, aging, sulfidizing, dissolving, degassing, filtering, spinning into yarn, post-processing and drying; and in the course of processing, adding nano white-crystal pulp, wherein the nano white-crystal pulp accounts for 0.5-10% of the alpha cellulose by weight. In the invention, the nano white-crystal pulp is added in the course of manufacturing the bamboo-charcoal viscose fiber to manufacture the high-whiteness bamboo-charcoal viscose fiber. The prior bamboo-charcoal viscose fiber can be only black or grey; however, the high-whiteness bamboo-charcoal viscose fiber has high whiteness which is greater than or equal to 60%. The high-whiteness bamboo-charcoal viscose fiber can be colored with various dyes, and has the functions of bacterial inhibition, far infrared emission and negative oxygen-ions, thereby having wide application range.

A functional electric conductive yarn and a manufacture method thereof belong to the textile technical field and are used to settle the problem of the conductivity, the bacterial inhibition and the skin touching of the yarn. 60 to 70 percent of terylene, 15 to 20 percent of ramie, 10 to 20 percent of the bamboo fiber, and 1 to 2 percent of the conductive fiber are sued as the raw materials to spin the 50s yarn. The conductive fiber is the carbon fiber. The invention also provides a method to manufacture the electric conductive yarn. The invention integrates the advantages of the terylene, the ramie, the bamboo fiber, and other materials, and the anti-static conductive fiber is added as well, to produce the electric conductive yarn. Tested according to relevant standards, when the product is electrified by friction, the charge density reaches the standard of the first-class product. Fabrics manufactured with the invention are provided with the characteristics of the terylene, the ramie and the bamboo fiber, and are soft but not weak, conductive, bacteriostatic, crease-resistant and good in the skin touching. Thus, the fabrics can be widely used as the top-grade protective fabrics.

The invention relates to a method for preparing antibacterial blending polyester heteromorphic fibre in the technical field of nano materials. The method comprises the following steps: carrying out blending fusion processing on silver ion antibacterial agent and master particle base material to prepare an antibacterial master particle; adding fiber base material into the antibacterial master particle and carrying out secondary blending fusion processing; carrying out thread spraying and coiling processing on fusant to obtain a pre-orientation thread; after the pre-orientation thread is cooled and stored to carry out false twisting deformation processing, preparing the antibacterial blending polyester heteromorphic fibre. The antibacterial blending polyester heteromorphic fibre prepared by the method has the ling density being more than 83.3, the breaking strength being more than 3.35, the breaking strength being more than 2.80 and the breaking elongation being more than 18, and an antibacterial performance index of the antibacterial blending polyester heteromorphic fibre, namely the bacterial 5-min bacterial inhibition rate of 5 percent of JAGZDE dissolved solution is 99.99 percent of enterobacterium, 99.99 percent of golden yellow staphylococcus and 99.96 percent of candida albicans.

The invention relates to an environmental-friendly ventilation type composite natural emulsion product as well as a preparation method and application thereof, and belongs to the technical field of emulsion products. The environmental-friendly ventilation type composite natural emulsion product is prepared from the following raw materials in parts by weight: 190-210 parts of natural emulsion, 20-24 parts of sulphur, 11-13 parts of an oxidizer, 1-1.7 parts of a dispersing agent, 95-105 parts of an accelerant, 36-39 parts of a hardener, 2-3 parts of castor oil, 5-7 parts of oleic acid, 1.6-2.4 parts of potassium hydroxide, 14-16 parts of styrene-butadiene co-polymerized rubber emulsion and 130-142 parts of water. The environmental-friendly ventilation type composite natural emulsion product disclosed by the invention not only has favorable ventilation perspiration properties and favorable bacterial inhibition, but also has excellent toughness, excellent wear resistance and favorable density and hardness, so that emulsion products are soft and comfortable, are favorable in hand feel, can effectively protect skins and are environmental-friendly and healthy.

The invention relates to an antibacterial agent comprising, as active product, a haemostatic contact tissue with an acid pH combined with povidone iodine, the haemostatic contact tissue being regenerated or non-regenerated oxidized cellulose. It also relates to a device used for active protection of incision margins and incorporating such an antibacterial agent. The applicant has now demonstrated surprisingly that the combination of regenerated or non-regenerated oxidized cellulose with povidone iodine provided a degree of bacterial inhibition superior to simple use of regenerated or non-regenerated oxidized cellulose on its own or of povidone iodine on its own. This therefore represents a synergistic effect, which yields a novel agent that is both a very powerful haemostatic and also very powerful antibacterial substance.

The invention belongs to the field of herbal cosmetic additives and discloses an apocynum venetum extract, a preparation method thereof and application thereof to cosmetics. The apocynum venetum extract is prepared by the following steps of: removing impurities from dogbane leaves and washing the dogbane leaves; performing continuous countercurrent extraction for 30 to 90 minutes at the temperature of between 45 and 70 DEG C and then filtering to obtain filtrate, wherein the weight ratio of the dogbane leaves based on the dried weight to water is 1:8 to 1:20; adding a chitosan flocculating agent into the filtrate, standing, performing centrifugation and removing precipitates to obtain the clear solution of an extract; performing vacuum concentration; washing macroporous resins on the concentrated solution with distilled water to colorless; performing elution with ethanol at the concentration of 20 to 85 percent; detecting the eluent and collecting active ingredients; and spray drying to obtain the apocynum venetum extract with the total flavonoid content of over 30 percent. The apocynum venetum extract can be applied to developing functional cosmetics with effects of skin peroxidation resistance, senility delay, whitening, radiation resistance, sun protection, inflammation resistance, allergic resistance, bacterial inhibition, moistening, moisture maintenance and the like.

The invention relates to laundry detergent, in particular to efficient laundry detergent with bacterial inhibition and sterilization functions. The laundry detergent comprises components in percentage by weight as follows: 17%-23% of a surfactant, 1%-3% of an acid aid, 0.2%-0.5% of caustic soda flakes, 0.3%-0.5% of a chelating agent, 3%-6% of heartleaf houttuynia herb extract, 0.2%-0.4% of a preservative, 1%-2% of a thickening agent, 0.5%-1% of acorus gramineus essential oil, 1%-2% of fructus amomi essential oil, 1%-2% of licorice extract, 0.6%-1.5% of tea saponin, 0.4%-0.8% of lavender essential oil, 0.6%-1.2% of mint essential oil and the balance of deionized water. The efficient laundry detergent has an inhibiting function on streptococcus hemolyticus, staphylococcus aureus, hemophilus influenza, catarrhalis, pneumococcus, escherichia coli, shigella dysenteriae and salmonella typhi, also has an inhibiting function on various viruses and further has a body immunity enhancing function and an anti-tumor effect.

The invention discloses a multifunctional microemlusion gel preparation and a preparation process thereof, and belongs to the technical field of medicines. The preparation mainly comprises bulk pharmaceutical chemicals (such as non-steroidal anti-inflammatory drugs-diclofenac sodium, ibuprofen, indometacin, antifungal drugs-ornidazole, antiviral drugs-ganciclovir, hormone drugs-dexamethasone, local anesthesia drugs-lidocaine and irritants-menthol), a cationic polymer and a microemlusion, can further comprise gel or a thickener, and can be used for transdermal drug delivery and local drug delivery. The preparation process is simple, convenient, good in stability and pollution-free. Compared with existing cream and gel, the preparation has the advantages that a novel action mechanism is adopted, the accumulative penetration amount of unit area of drugs is remarkably increased, a certain slow-release effect is achieved, and the drug delivery frequency and the drug delivery amount can be reduced; a chemical penetration enhancer and a conventional preservative are not added, a certain bacterial inhibition effect is achieved, the skin irritation is avoided, and the use safety of the drugs is improved.

The invention discloses a preparation method of a graphene-containing microfiber material. The preparation method comprises 1, preparing a fiber bat from figured sea-island polyester fibers, modified high shrinkage polyester fibers and graphene fibers, 2, preparing a base fabric, 3, immersing the base fabric in polyvinyl alcohol, 4, immersing the base fabric in PU, 5, carrying out alkali reduction treatment, and 6, carrying out functional agent treatment dry process overlaying, wherein the overlaying layer is prepared through orderly coating a carrier with surface layer slurry to obtain a surface coating, coating the surface coating with middle layer slurry to obtain a middle coating, coating the middle coating with graphene-containing slurry to obtain a bottom coating and coating the bottom coating with binder layer slurry to obtain a binder coating. The invention also discloses a preparation technology using the graphene-containing microfiber material and product. Through use of graphene, physical property indexes such as elasticity, toughness, tearing strength, wear resistance and tear resistance are improved and bacterial inhibition effects are obtained. The physical property indexes of the product with the graphene-containing microfiber material are significantly higher than those of similar products and can be widely used in special equipment such as for protection and military shoes, apparels and equipment.

The invention relates to a traditional Chinese medicine eucommia bark toothpaste and a preparation method thereof, and belongs to the technical field of toothpastes. The traditional Chinese medicine eucommia bark toothpaste comprises the following raw materials, by weight, 30-50% of a friction agent, 15-30% of a wetting agent, 0.5-3% of a binder, 0.5-3% of a foaming agent, 0.1-0.5% of a sweetening agent, 0.1-0.3% of a preservative, 0.5-1.5% of a flavor, 0.1-2% of a eucommia bark extract, and the balance of deionized water. The traditional Chinese medicine eucommia bark toothpaste is prepared by sequentially adopting the following steps: (1) extracting a eucommia bark extract; (2) preparing a toothpaste; and (3) packaging. According to the present invention, ultrasonic waves are adopted to carry out assisted extraction on eucommia bark leaves so as to improve extraction rate of active ingredients in the eucommia bark leaves and save medicinal resources; and contents of the active ingredients in the eucommia bark leaves are increased, such that functions of bacterial inhibition, inflammation resistance, gingival bleeding reduction, oral ulcer repair and the like of the eucommia bark toothpaste are further enhanced.

The invention discloses a production method of a fresh-keeping sausage casing. The production method of the fresh-keeping sausage casing is characterized in that in the sausage pickling working procedure, a sausage casing preservative which is 2-10% of the mass of the sausage casing in sausage coating salt is added, and then pickling is carried. The sausage casting preservative provided by the invention can effectively inhibit the growth and breeding of sausage casing halophilic bacteria; moreover, natural extractives are stable in nature, are safe to use, and guarantee the quality of the sausage casing well; three kinds of fresh-keeping reagents with anticorrosion and bacterial inhibition effects are adopted; meanwhile, the breeding of the sausage casing halophilic bacteria is inhibited effectively by utilizing the synergistic effect of the preservatives, thereby preventing the red sausage coating salt phenomenon and protecting the color of the sausage casing; a biological fresh-keeping agent is low in cost, is less in using quantity, and is convenient to prepare; the red stain phenomenon in the sausage storage and transportation process is reduced; the quality of the sausage casing is protected; the economical loss is reduced; the production efficiency is increased; the biological fresh-keeping agent of the sausage casing is added in the stage of charging salt for sausage casing and picking so as to effectively inhibit the breeding of the halophilic bacteria; the process is simple, and the production cost is low.

The invention provides washing and caring supplies. Ingredients of the washing and caring supplies contain xylo-oligosaccharide and are free of a preservative. According to the washing and caring supplies, the xylo-oligosaccharide is applied to the washing and caring supplies instead of the preservative in the prior art, so that the washing and caring supplies are free of any irritation to human bodies, and the injury to the human bodies caused by the preservative is avoided; and meanwhile, the moisture preserving performance and bacterial inhibition of the washing and caring supplies are improved.

The invention discloses aquagel, a preparation method therefor and an application of the aquagel. The aquagel is a product obtained through subjecting an O-quaternary ammonium salt chitosan solution and an aldehyde-group sodium alginate solution to a mixed reaction. Simultaneously, the invention further discloses the preparation method for the aquagel. The method comprises the following steps: 1)modifying chitin to prepare O-quaternary ammonium salt chitosan; 2) modifying sodium alginate to prepare aldehyde-group sodium alginate; and 3) preparing the aquagel. The invention further discloses the application of the aquagel. The aquagel disclosed by the invention has bacterial inhibition, moisture preserving property and high biocompatibility and has a broad application prospect in the fields of biomedicine, reshaping facial beautification and the like. Aquagel products can serve as wound surface dressing in medical clinics and products of skin repairing, nursing and the like of reshaping facial beautification.

The present invention discloses Lactobacillus paracasei ZLP019, which has a preservation number of CGMCC No.11532, and has characteristics of good acid resistance, good cholate resistance and good bacterial inhibition. According to the present invention, with the application of the Lactobacillus paracasei ZLP019 to prepare the freeze-drying preparation, the live bacteria survival rate is high, and the preparation is conveniently used in feed enterprises and farms; and after the preparation is directly added to sow feed according to the ratio requirement, the reproductive performance of sows can be improved, the daily weight gain and the survival rate of suckling piglets can be improved, the intestinal health of sows can be improved, the harmful bacteria emission in feces can be reduced, and the environmentally friendly breeding environment can be easily achieved.

The invention discloses chitosan derivative based clean makeup-removing wet tissue with effects of bacterial inhibition and moisture preservation. The chitosan derivative based clean makeup-removing wet tissue with the effects of bacterial inhibition and moisture preservation is prepared from raw materials in percentage by weight as follows: 2%-5% of chitosan derivatives, 5%-10% of PEG-8 caprylic / capric glycerides, 3%-8% of butanediol, 2%-5% of glycerin, 1%-3% of trehalose, 1%-5% of olive oil PEG-6 esters, 0.5%-3% of a skin conditioner, 0.15%-0.3% of phenoxyethanol, 0.15%-0.3% of ethylhexylglycerin, 0.1%-0.2% of methylparaben, 0.05%-0.2% of sodium hyaluronate, 0.01%-0.05% of essence and the balance of deionized water. According to the chitosan derivative based clean makeup-removing wet tissue with the effects of bacterial inhibition and moisture preservation and a preparation method, the makeup-removing wet tissue prepared with the preparation method is low in production cost, high in stability and good in cleansing power and realizes deep cleaning, besides, the makeup-removing wet tissue further has the effects of bacterial inhibition and moisture preservation, the facial skin after application of the makeup-removing wet tissue is smooth and tender, and makeup residues on the facial skin are removed.

The invention relates to a low-melting-point antibacterial specially-shaped polyester monofilament. The low-melting-point antibacterial specially-shaped polyester monofilament comprises the following raw materials by weight percent: 1 to 5 percent of antibacterial agent, 5 to 25 percent of pigment, 0.5 to 1 percent of dispersing agent, 0.5 to 1 percent of antioxidant and the balance of low-melting-point polyester slices; chitosan is likely to dissolve in weak-acid solvent, particularly the dissolved solution contains amino groups, and the amino groups are combined with negative electrons to inhibit the bacteria. Due to the bacterial inhibition activity of the chitosan, the chitosan is widely applied in the fields such as textiles and the like; the processing technology is simple and easy to popularize and use.

The present invention relates to the technical field of materials, and discloses a novel air refreshing agent, which is characterized by comprising the following raw materials by weight: 1-10% of a grapefruit seed extract, 1-10% of eucalyptus essential oil, 1-10% of a hedera nepalensis var. sinensis (tobl.) rehd extract, 5-15% of a pericarpium citri reticulatae extract, 2-7% of a nicotine decomposition agent, 1-10% of polyacrylate, 6-12% of ethanol, 3-6% of sorbic acid, 1-5% of essence, 10-15% of carrageenan, and the balance of deionized water. Compared with the air refreshing agent in the prior art, the air refreshing agent of the present invention has the following advantages that: the formula is rational, the active ingredient maintaining time is long, the natural plant extraction solution is adopted as the main raw material, the cost is low, the nicotine decomposition agent is added, the air can be effectively purified, and bacterial inhibition and sterilization can be provided.

The present invention discloses an antibacterial peptide, a preparation method and applications thereof. The antibacterial peptide is a porcine lactoferrin peptide LFP-20 or a reconstruction antibacterial peptide LF-2 or a reconstruction antibacterial peptide LF-6. The antibacterial peptide preparation method comprises adopting a solid phase chemical synthesis method or a genetic engineering expression technology to clone encoding gene of the antibacterial peptide to a vector, and then expressing in host cells to obtain the antibacterial peptide, wherein engineering bacterial used in the genetic engineering expression technology is genetic engineering bacteria P.pastorisSMD1168, and an expression vector is an eukaryotic expression vector PICZalphaA. The invention further relates to an application of the antibacterial peptide in preparation of drugs for treatments of gram-positive bacteria or gram-negative bacteria infectious diseases. With the reconstruction antibacterial peptide, in vitro bacterial killing activity and bacterial killing speed of the LFP-20 can be increased, and permeability of the LFP-20 on inner membranes and outer membranes of bacterial can be enhanced so as to enhance bacterial killing capability of the LFP-20. The reconstruction antibacterial peptide LF-2 and the reconstruction antibacterial peptide LF-6 further have strong in vivo bacteria removing capability. The present invention further relates to a method for expressing the recombinant reconstruction antibacterial peptide LF-6 by using pichia pastoris yeast. According to the present invention, the process is simple, and the product has significant bacterial inhibition activity.