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67 results about "Magnetosome" patented technology
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Magnetosome are membranous structures present in magnetotactic bacteria (MTB). They contain iron-rich magnetic particles that are enclosed within a lipid bilayer membrane. Each magnetosome can often contain 15 to 20 magnetite crystals that form a chain which acts like a compass needle to orient magnetotactic bacteria in geomagnetic fields, thereby simplifying their search for their preferred microaerophilic environments. Recent research has shown that magnetosomes are invaginations of the inner membrane and not freestanding vesicles. Magnetite-bearing magnetosomes have also been found in eukaryotic magnetotactic algae, with each cell containing several thousand crystals.
Methods and compositions for the production and use of magnetosomes
Methods and compositions for using magnetosomes as cellular contrast agents and markers for magnetic resonance imaging are provided. Certain methods involve synthesizing magnetosomes in a cell as directed by a nucleotide construct comprising an exogenous polynucleotide sequence, wherein the magnetosome serves as a contrast agent or marker for magnetic resonance imaging. Methods of synthesizing and isolating magnetosomes for introduction into immune-matched cells within a tissue or subject for use as a contrast agent or marker for magnetic resonance imaging are also provided. Also provided are methods for stably transfecting cells to express a polypeptide that drives or modulates magnetosome production in the cell, cells produced by such methods and methods for their isolation, transgenic animals comprising at least one eukaryotic cell produced by such methods, and vectors and delivery systems for the transfection of such cells. Further provided are methods for non-invasively generating a visible image of a tissue or subject containing at least one cell such transfected cell, as well as use of such methods to monitor the location, migration, or proliferation of cells in a tissue or subject or to detect or monitor gene expression in a tissue or subject.
Owner:EMORY UNIVERSITY +1
Biomagnetism nano target anti-cancer drug and its preparation
ActiveCN1927400AGood biocompatibilitySmall side effectsInorganic material magnetismRadioactive preparation carriersChemical reactionSide effect
The invention relates to a biological nanometer magnetic target anti-cancer drug, which is formed by coupled biological nanometer magnetic smalls and anti-cancer chemical drug. Wherein, the biological nanometer magnetic small is nanometer magnetic particle formed in magnetic bacterial cell, at 35-120nm diameter, while its main component is Fe3O4 or Fe3S4; single magnetic particle is packed by film; and the coupled anti-cancer chemical drug comprises chemotherapy drug, nucleic acid drug, radioactive nuclide or antibody drug. The invention also provides relative production that using physical adsorption couple or based on the active function group contained by smalls and anti-cancer drug, to select right coupler via chemical reaction to couple them. And the smalls has better bioavailability, less side effect, therefore, the anti-cancer drug can be accurately transmitted to ill part via external magnetic field, to reduce the contact between drug and normal organism., to realize target positioning treatment.
Owner:南京英睿杰生化科技有限公司
Method for producing magnetosome by cultivating magnetotactic bacteria
InactiveCN101434921AGuaranteed normal growthEasy to operateBacteriaMagnetotactic bacteriaMagnetosome
The invention provides a method for producing magnetosome by cultivating magnetic bacteria, which takes air as an oxygen supplying way and maintains the continuous growth of the magnetic bacteria with a material feeding way, and when dissolved oxygen reaches or gets lower than the dissolved oxygen suitable for magnetosome production, the dissolved oxygen is controlled at a proper dissolved oxygen range that is suitable for magnetosome production through agitating rotation speed, air flow speed and the dissolved oxygen in cascade. The magnetic bacteria cultivating method does not need air distribution and pure inert gases, but uses air aeration for oxygen supply, thus lowering initial dissolved oxygen from the saturation state of 100 percent to 0 percent, and the coordinated adjustment of agitating rotation speed and air flow speed can control the dissolved oxygen to be any value between the saturation states of 0 percent and 20 percent, thus lowering the production cost of magnetosome and providing technical guarantee for researching the physiological and biochemical characteristics of the magnetic bacteria under different dissolved oxygen levels.
Owner:CHINA AGRI UNIV
Bacteria nano magnetosome loaded with primary amino medicine and preparation method thereof
InactiveCN101077418AHigh drug loadingNot easy to gatherPowder deliveryOrganic active ingredientsCarrying capacityBiochemistry
The present invention provides one kind of nanometer bacterial magnetic corpuscle carrying primary amino group medicine and its preparation process. The nanometer bacterial magnetic corpuscle consists of three structural units, including homotype double-function reagent, primary amino group medicine and nanometer bacterial magnetic corpuscle. The nanometer bacterial magnetic corpuscle carrying primary amino group medicine has high medicine carrying capacity, less aggregation, easy separation and purification, anticancer and antitumor effect similar to that of pure primary amino group medicine, but much lower toxicity.
Owner:CHINA AGRI UNIV
Facultative anaerobic magnetotactic bacterium, and separation and culturing method therefor, and process for extracting and purifying magnetosome thereof
The invention is about a kind of magnetotactic bacterium which is separated from the mud sample in the iron-affluent watershed. The bacterium is preserved in the Chinese typical culture collection center. The preserving code is CCTCC NO:M205105 while the classified name is Magnetotactic bacterium MB-TZ. The bacterium is facultative anoxybiontic bacterium and the state of the thallus is circular staff. A thallus can produce 3-20 circular magnetic globules which are mainly comprised by iron, calcium, fosforus, oxygen and magnesium. The bacterium has many advantages such as short producing cycle, easy to cultivate and easy to be produced in factories. During the extracting and purifying of the magnetic globules, the invention adopts the treating method of repeating freeze thawing combining with supersonics, so it can dissolve the thallus more thoroughly and increase the yield of magnetic globules.
Owner:TONGJI HOSPITAL ATTACHED TO TONGJI MEDICAL COLLEGE HUAZHONG SCI TECH
Chemostatic high density culture method of magnetotactic bacteria high yield magnetosome
InactiveCN101376900AShorten the fermentation cycleEasy to operateBacteriaMicroorganism based processesDry weightVolumetric Mass Density
The invention provides a method for culturing magnetotactic bacterium high-yield magnetic particles chemostatically with high density; magnetotactic bacterium is cultured through a submerged fermentation culture method; the fermentation culture medium contains a carbon source, a nitrogen source and an iron source; dissolved oxygen is controlled in the fermentation process by stages, and materials are supplemented by regulating the pH value. The method realizes the chemostatical high-density culture of the magnetotactic bacterium and the mass production of the magnetic particles; the density of the cells cultured for 36h to 48h is 12OD565nm, the dry weight of the magnetic particles is 80mg / L to 100mg / L, and the fermentation cycle is shortened. The method lays solid foundation for the industrialized production of bacterium magnetic particles.
Owner:CHINA AGRI UNIV
Preparation method for Fe3S4 nanocrystalline material
ActiveCN102874879AHigh crystallinityImprove stabilityMaterial nanotechnologyIron sulfidesSolubilityBiocompatibility Testing
The invention provides a preparation method for a Fe2S4 nanocrystalline material. The method comprises the following steps of: mixing an iron source compound and beta-cyclodextrin in ethylene glycol, and heating to obtain turbid liquid; and mixing the obtained turbid liquid and a sulphur source compound and reacting to obtain the Fe3S4 nanocrystalline material. According to the method, the Fe3S4 nanocrystalline material which is prepared by using the ethylene glycol as a solvent and the beta-cyclodextrin as surfactant is high in crystallinity, stability, water solubility and biocompatibility. By the wrapping of the beta-cyclodextrin, the surface of the Fe3S4 nanocrystalline material is provided with a very thin protection film, so that the nanocrystalline material is similar to biological magnetosome in nature, has the function which is similar to that of the biological magnetosome, and can be used in the fields of magnetic resonance imaging, medicine carrying and other biological medicines.
Owner:UNIV OF SCI & TECH OF CHINA
Medicine slow-release nanoparticle wrapping magnetosomes of magnetotactic bacteria and preparation method of medicine slow-release nanoparticle
InactiveCN105193733AOrganic active ingredientsPharmaceutical non-active ingredientsMedicineMicrosphere
The invention relates to a medicine slow-release nanoparticle wrapping magnetosomes of magnetotactic bacteria and a preparation method of the medicine slow-release nanoparticle. The medicine slow-release nanoparticle comprises the magnetosomes of magnetotactic bacteria, chitosan, pharmaceutic adjuvant and medicine components. The preparation method includes the steps of collecting the magnetosomes of magnetotactic bacteria, mixing the materials, conducting spray drying to obtain the nanoparticle, wherein the grain size of the nanoparticle ranges from 100 nanometers to 50 micrometers. According to different treatment aims, the nanoparticle can serve as an oral slow-release formulation, can be used as a slow-release formulation for preparing targeted medicine as well, and can be widely applied to the field of biological medicine.
Owner:NORTHEAST FORESTRY UNIVERSITY
Immune magnetosome for detecting Bt insecticidal protein in mice tissue and preparation method thereof
InactiveCN102419370ASmall and uniform particle sizeGood conditionBiological testingLuminous intensityAdjuvant
The invention relates to an immune magnetosome for detecting Bt insecticidal protein in mice tissue and a preparation method thereof. The immune magnetosome is coated by anti-Bt insecticidal protein polyclonal antibody with the particle size being 50nm. The preparation method of the immune magnetosome comprises the following steps of: performing ultrasonic disruption and magnetic adsorption to obtain purified magnetosome of magnetotactic bacteria, mixing adjuvant and Bt insecticidal protein, immunizing mice, performing separation and purification to obtain mouse anti Bt insecticidal protein polyclonal antibody and coupling the antibody and the magnetosome by a carboxy-amino chemical coupling method to obtain the immune magnetosome for detecting Bt insecticidal protein in mice tissue. By chemiluminescence EIA detection, the immune magnetosome provided by the invention has a luminous unit of 83kcounts / microgram magnetosome. The correlation of luminous intensity and Bt protein concentration shows that as the protein concentration goes up, the luminous intensity goes down with a range being 1-103ng / ml and with a minimum detectable concentration being 1ng / ml. The method for the practical detection of Bt insecticidal protein content in mice tissue has advantages of high sensitivity, stable result and simple operation, and shows a good application prospect.
Owner:WUHAN UNIV OF TECH
Method for continuous and batch purification of bacterial magnetic particles
InactiveCN101372364AResidue reductionContinuous operationFerroso-ferric oxidesIron sulfidesHigh pressureMagnetotactic bacteria
The invention provides a method for purifying a bacterial magnetosome at a large scale, which comprises the following steps: breaking magnetotactic bacterial cells by a high-pressure homogenizer, separating and cleaning the magnetosome by a magnetic chromatography system, digesting membrane protein with protease k, electroeluting, desalting by a magnetic stirring system, etc. The method has the advantages of continuous operations, and that the purification period is shortened from 2-3 months to less than one week, damage caused by ultrasonication to the plasma membrane of the magnetosome is effectively reduced, the membrane protein on the surface of the magnetosome is reduced and the immunogenicity of the purified magnetosome is lowered.
Owner:CHINA AGRI UNIV
Magnetotactic bacteria or magnetotactic microbe separator
InactiveCN1884471AResolve separabilitySolve purificationBioreactor/fermenter combinationsBiological substance pretreatmentsRubber ringMicroorganism
The invention relates the segregator, comprising permanent magnet components, cover (3), separating cap (4) and sample cap (5). In the separating cap (4) there is inner edge (6) which is connected with inner wall of separating cap (4); under interior extent (6) there is rubber ring (7), and between them there is filter paper; permanent magnet components comprises N magnet and S magnet; separating cap (4) is connected with sample cap (5). The invention solves the problem that the magnetic bacteria is not easy to separate, and the invention has the advantages of simple technology, low cost, easy usage and strong practicality.
Owner:WUHAN INST OF VIROLOGY CHINESE ACADEMY OF SCI
Optimal dissolved oxygen control method for producing magnetosome by cultivating magnetotactic bacteria
The invention provides an optimal dissolved oxygen controlling method for producing magnetosome through magnetic bacteria cultivation, under the precondition ensuring that cell growth is not limited by nutrition, the method takes the speed slowing of cell growth as a signal that dissolved oxygen reaches and gets lower than the critical dissolved oxygen of cell growth, and the method controls rotation speed and aeration flow speed so as to maintain the dissolved oxygen constantly at the critical dissolved oxygen of cell growth, which is the optimal dissolved oxygen level that is suitable for both cell growth and magnetosome synthesis. Experiments prove that by adopting the optimal dissolved oxygen controlling method for producing magnetosome through magnetic bacteria cultivation, not only the final cell cultivation level and the magnetosome yield, but also the cell growth speed and the magnetosome throughput rate achieve the highest level in existing reports.
Owner:CHINA AGRI UNIV
Water-soluble fluorescent magnetosome and preparation method thereof
InactiveCN104388076AHigh fluorescence intensityImprove photostabilityMaterial nanotechnologyNanoopticsMagnetosomeOrganic chemistry
The invention provides a water-soluble fluorescent magnetosome and its preparation method. The water-soluble fluorescent magnetosome contains the following ingredients: magnetosome and cysteine. In addition, cysteine modifies the surface of magnetosome. According to the invention, a cysteine-modified fluorescent magnetosome is prepared by a biomineralization-surface modification method. The fluorescent magnetosome is water-soluble and has good fluorescent stability and high fluorescence intensity. Meanwhile, the preparation method is simple and easy to operate, and no toxic substance participates in the preparation. According to the invention, application of the fluorescent magnetosome in magnetic targeting and fluorescence trace is greatly enhanced.
Owner:EAST CHINA UNIV OF SCI & TECH
Bacterial magnetic particle (BMP)-agglutinin complex and preparation method and application thereof
InactiveCN104624176AGood dispersionSmall particle sizeOther chemical processesOvalbuminDispersityCross-link
The invention discloses a bacterial magnetic particle (BMP)-agglutinin complex and a preparation method and application thereof, belonging to the technical field of separation and purification. The preparation method comprises the following steps: performing surface modification and transformation on BMPs, and adding a cross-linking agent and agglutinin for coupling, thereby obtaining the BMP-agglutinin complex. The surfaces of the BMPs are modified, the influence of self-proteins of the BMPs on subsequent application is eliminated, more primary amino is provided for agglutinin coupling due to the addition of PE, the coupling efficiency is improved, and the dispersity of the BMPs is improved; the cross-linking agent (BS3) serves as a connecting arm, so that covalent coupling is realized between the BMPs and the agglutinin, and an agglutinin recognition sugar chain area is not damaged; and moreover, the concentration of a buffer solution is regulated, the preparation time is shortened, and the coupling efficiency is improved. The complex disclosed by the invention is used for enriching and separating specific glycoproteins, and compared with traditional affinity chromatography, the method disclosed by the invention has the advantages of fewer steps, short time and the like.
Owner:JIANGNAN UNIV
Composite tumor gene vaccine taking bacterial nano magnetosome as carrier and preparation method thereof
InactiveCN102028958AEasy gene deliveryGenetic material ingredientsPharmaceutical non-active ingredientsPhosphateIn vivo
The invention relates to a composite tumor gene vaccine taking a bacterial nano magnetosome as a carrier and a preparation method thereof. The range of a pH value of the optimal phosphate buffer system when the bacterial nano magnetosome is connected with the gene vaccine and magnetic field intensity and magnetic field acting time used by in-vitro transfection and in-vivo immunization are provided specifically, and treatment dosage range and immunization way are determined when the composite gene vaccine is used for treating a tumor model. A novel simple and convenient gene delivery mode is established, and a preparation condition and an immunization method of a new gene vaccine are provided for gene treatment.
Owner:CANCER INST & HOSPITAL CHINESE ACADEMY OF MEDICAL SCI
Method for measuring drug-loading rate of bacteria nano magnetosomes
ActiveCN101173893AGuaranteed continuityEasy to operateColor/spectral properties measurementsFluorescence/phosphorescenceDrugs solutionFluorescence spectrometry
The invention relates to a way of determining the drug loading of the bacteria nanometer magnetosome, which uses an ultraviolet spectrum or a fluorescence spectrum to determine the biggest ultraviolet absorbing wavelength or biggest emission wavelength Gamma max of the tested drug. The ultraviolet absorbance values or the fluorescence transmission intensity values of the drug solution with different concentrations are tested at the Gamma max to draw the standard working curves. The drug with known concentration mixed-react with the bacteria nanometer magnetosome, and the magnetosome after reaction is separated to acquire the supernatant; and the drug solution with the same concentration and quantity with the former solution is prepared without reacting with the bacteria nanometer magnetosome to be as the comparison solution of the blank reaction; the ultraviolet absorbance value or the fluorescence transmission intensity value of the supernatant and the comparison solution of the blank reaction at the Gamma max are respectively determined, and the drug loading of the bacteria nanometer magnetosome is calculated by the standard working curves according to the difference of the two.
Owner:南京英睿杰生化科技有限公司
Method for producing magnetosome by cultivating magnetotactic bacteria
InactiveCN101434921BGuaranteed normal growthEasy to operateBacteriaMagnetotactic bacteriaMagnetosome
Owner:CHINA AGRI UNIV
Bacterial nano magnetic corpuscle-glycosphingolipid compound and preparation method and application of compound
InactiveCN104211753AImprove utilizationPlay a targeting roleEnergy modified materialsPeptide preparation methodsRoom temperatureTumor region
The invention discloses a bacterial nano magnetic corpuscle-glycosphingolipid compound and a preparation method and an application of the compound, and belongs to the fields of separation and medicines. The BMPs-glycosphingolipid compound disclosed by the invention is prepared by the following steps: firstly, removing surface proteins of BMPs by using a surfactant; suspending the BMPs into a glycosphingolipid solution; and carrying out ultrasonic or room-temperature reaction, and incubating to couple the BMPs to the glycosphingolipid, thereby obtaining the bacterial nano magnetic corpuscle-glycosphingolipid compound. Irrelevant protein is effectively prevented from being introduced by removal of the surface proteins, and the protein acting with the glycosphingolipid can be obtained. The compound disclosed by the invention can be used for promoting utilization of the glycosphingolipid by cells, meanwhile, magnetic particles in the compound can play a targeting effect, and the compound is guided to be gathered towards the focus part, so that the drug targeting property is relatively high. After the compound is introduced into the tumor region, magnetic targeting thermal therapy can also be introduced, thereby further treating the focus.
Owner:JIANGNAN UNIV
Methotrexate-loaded magnetosome drug carrier and preparation method thereof
InactiveCN102989005ALow toxicitySignificant effectOrganic active ingredientsPharmaceutical non-active ingredientsSide effectGenipin
The invention provides a methotrexate-loaded magnetosome drug carrier and a preparation method thereof. Methotrexate is crosslinked on a biological film of a magnetosome through genipin and the magnetosome is extracted from magnetotactic bacteria. The preparation method comprises the following steps of: 10, dispersing magnetosome particles after being subjected to purifying and freeze drying in a solvent and adding a methotrexate solution; 20, ultrasonically dispersing and fully mixing the mixed liquor obtained in the step 10; 30, adding a genipin solution and continuing the ultrasonic dispersion to be uniform; and 40, putting the mixed liquor obtained in the step 30 in a shaker to carry out crosslinking and obtaining the methotrexate-loaded magnetosome drug carrier after crosslinking saturation. According to the invention, a natural magnetic targeting antitumor drug delivering system can be constructed; and meanwhile, the utilization ratio of methotrexate can be increased and the toxic and side effects of methotrexate to normal cells and tissues can be reduced. The preparation method is simple in process and convenient for operation.
Owner:HUAQIAO UNIVERSITY
Treatment Of Cancer Or Tumor Induced By The Release Of Heat Generated By Various Chains Of Magnetosomes Extracted From Magnetotactic Bacteria And Submitted To An Alternative Magnetic Field
In this disclosure, we describe a method for the treatment of tumor(s) or tumor cell(s) or cancer(s) in a subject in need by the generation of heat. The latter is produced by chains of magnetosomes extracted from whole magnetotactic bacteria and subjected to an alternative magnetic field. These chains of magnetosomes yield efficient antitumoral activity whereas magnetosomes unbound from the chains or kept within the whole bacteria produce poor or no antitumoral activity. The introduction of various chemicals such as chelating agents and / or transition metals within the growth medium of the bacteria improves the heating properties of the chains of magnetosomes. Moreover, the insertion of the chains of magnetosomes within a lipid vesicle is also suggested in order to favor their rotation in vivo and hence to improve their heating capacity. The vesicle can contain an antitumoral agent together with the chains of magnetosomes. In this case, the agent is released within the tumors by heating the vesicle.
Owner:NANOBACTERIE
Culture method of magnetotactic bacteria AMB-1
The invention discloses a culture method of magnetotactic bacteria AMB-1. The culture method comprises the following steps that 1, activating bacteria; 2, obtaining first enlarged culture bacteria; 3, obtaining second enlarged culture bacteria; 4, obtaining third enlarged culture bacteria; 5, taking a proper amount of the third enlarged culture bacteria liquid obtained in the step 4 to be inoculated into a sterile fluid nutrient medium 1653 MSMG, and conducting fermenter culture; 6, conducting centrifugation to collect the bacteria in the materials obtained in the step 5, and conducting ultrasonication washing, purification and freeze drying to obtain magnetosomes. According to the method, the aim that the AMB-1 bacteria density and the magnetosome yield are greatly improved though fermenter culture can be achieved under the conditions that only the addition amount of an iron source is changed and pH is controlled to be constant.
Owner:HUAQIAO UNIVERSITY
Novel method for enriching and detecting biomedicine and environmental specimens by magnetic particles
PendingCN111308066AImprove enrichment effectDepsipeptidesVector-based foreign material introductionAntigenEngineering
The invention provides a novel method for enriching and detecting biomedical and environmental specimens by using magnetic particles. The method mainly comprises the following steps: preparing immunomagnetic beads; to be specific, coupling magnetosome with SPA by using a coupling method to prepare immunomagnetic beads; connecting the immunomagnetic beads with corresponding antibodies; to be specific, combining the Bdomain of the SPA with FC ends of non-variable regions of antibodies to prepare the immunomagnetic beads combined with the antibodies; and carrying out enrichment; to be specific, mixing biomedical and environmental specimens with the magnetic beads connected with corresponding antibodies, and enriching antigens corresponding to the antibodies. The method provided by the invention has a good enrichment effect on antigens in biomedical and environmental specimens, and is superior to synthetic magnetic beads.
Owner:BEIJING GUO KE RONG ZHI BIOTECH CO LTD
Difunctional nanoprobe for detecting mitochondrial cytochrome C as well as preparation method thereof
InactiveCN103550792AGood biocompatibilityGood dispersionIn-vivo testing preparationsBiocompatibility TestingEthyl group
The invention relates to a difunctional nanoprobe for detecting mitochondrial cytochrome C as well as a preparation method thereof. The preparation method comprises the following steps: taking a ligand of the mitochondrial cytochrome C; labeling fluorescein and aldehyde group on two ends of the ligand respectively; then adding magnetosome into the ligand again, and incubating overnight; then removing substances which do not react; then adding 1-(3-dimethyl amino propyl)-3-ethylcarbodiimide hydrochloride, N-hydroxysuccinimide and methoxy-carboxylation-polyethylene glycol, and incubating overnight; and then removing substances which do not react, thereby obtaining the difunctional nanoprobe for detecting the mitochondrial cytochrome C. The difunctional nanoprobe and the preparation method thereof, which are provided by the invention, have good biocompatibility; the prepared probe for detecting mitochondrial cytochrome C has good dispersibility.
Owner:张薇薇
Nanoparticles sequentially exposed to low intensity acoustic waves for medical or cosmetic applications
PendingUS20200000914A1Avoid toxicityAvoid equipmentUltrasound therapyAnalysing solids using sonic/ultrasonic/infrasonic wavesAcoustic waveNanoparti cles
An acoustic wave medical treatment of a body part of an individual in which nanoparticles are administered to the body part of the individual and the acoustic wave is applied on the body part. The acoustic wave is sequentially applied on the body part, and / or the nanoparticles are magnetosomes. Also, compositions that include these nanoparticles.
Owner:NANOBACTERIE
Method for culturing magnetosome-producing iron oxidizing bacteria
InactiveCN109207414AEasy to synthesizeGood magnetosome productionBacteriaMicroorganism based processesProduction rateOxygen flux
The invention relates to a method for culturing magnetosome-producing iron oxidizing bacteria, comprising the following steps: inoculating the magnetosome-producing iron oxidizing bacteria into a culture medium, fermenting and culturing, wherein the culture temperature is 20 DEG C and the fermentation temperature is 20 DEG C; 25 DEG C. In addition to the culture temperature, the invention furtherconsiders the influence of the composition of the culture medium, the oxygen flux and other parameters on the production of ferrooxidizing bacteria magnetosomes, and finally realizes the purpose of significantly increasing the production rate of magnetosomes.
Owner:HEILONGJIANG BAYI AGRICULTURAL UNIVERSITY
A kind of extraction method of ferulic acid in rice bran meal
ActiveCN107190028BReduce Reuse CostsReduce pollutionHydrolasesFermentationCross-linkFeruloyl esterase
Owner:XIAN HEALTHFUL BIOTECH
Supercritical carbon dioxide method for extraction separation of magnetosomes from magnetotactic bacteria
InactiveCN103449533BOvercome the disadvantages of reunionAvoid residueFerroso-ferric oxidesIron sulfidesOrganic solventWater soluble
The invention provides a supercritical carbon dioxide method for extraction separation of magnetosomes from magnetotactic bacteria. The method mainly includes the processes of organic solvent pretreatment, supercritical carbon dioxide extraction separation, organic solvent and water soluble residue removal. By using the method, magnetosomes can be extracted and separated from magnetotactic bacteria under optimal supercritical carbon dioxide fluid temperature, pressure conditions and extraction times. The magnetosomes obtained by extraction separation have the characteristics of small particle size, good monodispersity, high stability, no organic solvent residue, high saturation magnetization intensity, and high extraction separation efficiency, etc.
Owner:EAST CHINA UNIV OF SCI & TECH
Double cross-linking agent AMB-1 magnetosome drug carrier, and preparation method and application thereof
ActiveCN104524589ABiofilm wrappedGood biocompatibilityOrganic active ingredientsPharmaceutical non-active ingredientsCross-linkLipid formation
The invention discloses a double cross-linking agent AMB-1 magnetosome drug carrier, and a preparation method and application thereof. The double cross-linking agent AMB-1 magnetosome drug carrier employs an AMB-1 magnetosome possessing a natural lipid double-molecular-membrane layer as a carrier, employs genipin and poly(L-glutamic acid) as a double-molecule cross-linking material, so that the double cross-linking agent AMB-1 magnetosome drug carrier is formed, and is capable of carrying a single medicine or multiple medicines and helps to construct a targeting drug system. A natural double cross-linking agent is employed, the toxicity is low and the biocompatibility is good, the prepared double cross-linking agent AMB-1 magnetosome drug carrier is improved in drug loading and entrapment rate compared with a conventional technology, efficient loading of a single or multiple medicines is realized, burst release effect does not exist, the release period is long, the medicine self efficacy is not influenced, the effects of medicine combined usage and synergic interaction are realized while targetable drug delivery is realized, and also the preparation technology is simple, convenient to operate, green and environment-friendly, and possesses wide application prospect.
Owner:HUAQIAO UNIVERSITY
Supercritical carbon dioxide method for extraction separation of magnetosomes from magnetotactic bacteria
InactiveCN103449533AOvercome the disadvantages of reunionOvercome the cycleFerroso-ferric oxidesIron sulfidesOrganic solventWater soluble
The invention provides a supercritical carbon dioxide method for extraction separation of magnetosomes from magnetotactic bacteria. The method mainly includes the processes of organic solvent pretreatment, supercritical carbon dioxide extraction separation, organic solvent and water soluble residue removal. By using the method, magnetosomes can be extracted and separated from magnetotactic bacteria under optimal supercritical carbon dioxide fluid temperature, pressure conditions and extraction times. The magnetosomes obtained by extraction separation have the characteristics of small particle size, good monodispersity, high stability, no organic solvent residue, high saturation magnetization intensity, and high extraction separation efficiency, etc.
Owner:EAST CHINA UNIV OF SCI & TECH
Target protein-intein-magnetosome fusion gene, intelligent bacterial expression system constructed by target protein-intein-magnetosome fusion geneand used for automatically purifying product, and preparation method of intelligent bacterial expression system
The invention provides a target protein-intein-magnetosome fusion protein, an intelligent bacterium constructed by using the target protein-intein-magnetosome fusion protein and used for automatically purifying a product and a preparation method of the intelligent bacterial expression system, and the fusion protein is formed by directly connecting a target protein, intein and magnetosome membrane protein in series or operably connecting the target protein, the intein and the magnetosome membrane protein through a flexible Linker; the invention also provides a target protein-intein-magnetosome fusion gene. The fusion gene comprises an upstream sequence of a magnetosome membrane protein gene, a nano antibody gene, an intein gene, the magnetosome membrane protein gene and a downstream sequence of the magnetosome membrane protein gene; and the invention also provides an intelligent bacterium constructed by using the target protein-intein-magnetosome fusion gene and capable of automatically purifying a product . Compared with a traditional prokaryote expression system, the intelligent bacterium has the advantages of being mild in target protein purification condition, free of additional reagents, low in cost, easy to operate, high in purity and small in influence on the yield and the like of the target protein.
Owner:张金菊 +1
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