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39 results about "Buffered phosphate" patented technology

Phosphate-buffered saline (abbreviated PBS) is a buffer solution commonly used in biological research. It is a water-based salt solution containing disodium hydrogen phosphate, sodium chloride and, in some formulations, potassium chloride and potassium dihydrogen phosphate.

Method for determining polyphenylene sulfide in 2, 4-dichlorophenol rectification residual liquid

The invention discloses a method for detecting phenyl sulfide in rectification residual liquid of 2, 4-dichlorophenol through high performance liquid chromatography, and belongs to the technical field of chemical detection and analysis. The method comprises the following steps: dissolving a to-be-detected 2, 4-dichlorophenol rectification residual liquid sample to prepare a to-be-detected sample, and preparing phenyl sulfide standard substance solutions with different concentrations; the method comprises the following steps: determining a to-be-detected sample and a phenyl sulfide standard substance solution by adopting a high performance liquid chromatograph, drawing a standard curve and a linear regression equation according to a detection result of the phenyl sulfide standard substance solution, and analyzing the phenyl sulfide in the sample by combining the linear regression equation and a chromatographic peak map of the to-be-detected sample, wherein the mobile phase comprises a phase A and a phase B, the phase A is an aqueous solution of phosphate buffer salt, the phase B is methanol, and an isocratic elution mode is adopted. According to the present invention, with the method, the accurate determination of the phenyl sulfide content in the 2, 4-dichlorophenol rectification residual liquid is achieved, the timely and accurate data guidance is provided for the 2, 4-D production process, and the target of production cost saving is ultimately achieved.
Owner:HUBEI XINGCHEN TECHNOLOGY CO LTD

Preparation method of resveratrol and application of resveratrol in meat preservation

The invention belongs to the technical field of resveratrol synthesis, and particularly relates to a preparation method of resveratrol and application of resveratrol in meat preservation. The method comprises the following steps: taking 3, 5-dimethoxybenzoic acid as a raw material, and carrying out acylation reaction to obtain 3, 5-dimethoxybenzoyl chloride. Then reacting with p-acetoxystyrene to generate 3, 3 '-dihydroxy-3, 3'-dihydroxy-3 The preparation method comprises the following steps: taking 1, 5-dimethoxy-4 '-acetoxystilbene as a raw material, hydrolyzing and demethylating to obtain resveratrol, and preparing resveratrol lipid nanoparticle suspension by taking resveratrol, a ZIF-8 / chitosan compound, compound lipid, cholesterol, epsilon-polylysine, ascorbyl palmitate and phosphate buffer saline as raw materials. High load and controlled release of resveratrol are achieved, and the problems that resveratrol is poor in water solubility and prone to oxidation are solved.
Owner:ZHEJIANG TIANQI BIOCHEMICAL CO LTD

Sodium alginate-based hydrogel and preparation method thereof

The invention belongs to the technical field of hydrogel preparation, and particularly relates to sodium alginate-based hydrogel and a preparation method thereof. The raw materials of the kit comprise the following components in parts by weight: 20 mL of morpholinoethanesulfonic acid (MES) buffer solution, 0.06 g of N-hydroxysuccinimide (NHS), 0.2 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC), 0.2 g of RGD polypeptide, 0.1 g of a pH regulator, 0.1 g of a pH regulator and the balance of deionized water. The hydrogel comprises 175 [mu] L of an EDC / NHS activation solution, 1 g of sodium alginate (SA), 51 mL of a phosphate buffer solution (PBS), 1.44 g of low-acylated gellan gum powder, 0.16 g of high-acylated gellan gum powder, 0.1 g of RGD-SA powder, 0.2 g of VN-SA powder, 0.1 g of QK-SA powder, a VN polypeptide according to a molar ratio of VN to SA being 1: 15, and a QK polypeptide according to a molar ratio of QK to SA being 1: 15. And the biofilm has the characteristics of controllable mechanical strength and slow degradation, and is beneficial to long-term culture and tissue repair of cells.
Owner:CHENGDU MINSHAN CHUANGXIN BIOCHIP TECH CO LTD

Preparation method and application of vesicle formed by erythrocyte membrane encapsulating Newcastle disease virus

ActiveUS12668783B2Newcastle disease virus NDVCell membrane
The present disclosure proposes a preparation method of a vesicle formed by an erythrocyte membrane encapsulating Newcastle disease virus, including: mixing a compacted erythrocyte solution, a phosphate buffered saline (PBS) solution, and Newcastle disease virus (NDV); centrifuging a resulting mixture of erythrocytes added with NDV; and resuspending and precipitating the centrifuged mixture with a PBS solution to obtain the vesicle formed by the erythrocyte membrane encapsulating Newcastle disease virus.
Owner:ZHAO YONGXIANG

Preserving fluid of porcine fat-derived mesenchymal stem cell exosome as well as preparation method and application of preserving fluid

The invention relates to the technical field of biomedical sample preservation, and discloses a preserving fluid of porcine fat-derived mesenchymal stem cell exosomes, a preparation method and application thereof. The exosome preserving fluid provided by the invention comprises the following components in percentage by weight: 5%-20% of polyvinylpyrrolidone (PVP); 2%-10% of trehalose; 0.5%-5% of glycerol; according to the cryoprotectant, a cryoprotectant is adopted, a phosphate buffer solution (PBS) is adopted as a solvent, polyvinylpyrrolidone (PVP) is adopted to replace traditional dimethyl sulfoxide (DMSO) to serve as the cryoprotectant, the problems that in the prior art, a preserving fluid is large in toxicity and poor in preserving effect are solved, and the application of the cryoprotectant in medical external application such as wound repair, inflammation treatment and skin care is expanded.
Owner:ZHEJIANG BAIDI BIOTECHNOLOGY CO LTD

Radioactive yttrium phosphate suspension and method of preparing the same

A radioactive yttrium phosphate suspension, including a phosphate buffered saline solution and a plurality of radioactive yttrium phosphate particles suspended in the phosphate buffered saline solution. The plurality of radioactive yttrium phosphate particles are between 0.1 um to 2 um in diameter. The plurality of radioactive yttrium phosphate particles are generally spherical. The YPO4 particle concentration is in the range of 40 mg / ml to 125 mg / ml.
Owner:VIVOS INC

A method for measuring the chromatographic purity of 2,4,6-trimethylbenzenesulfonyl chloride using HPLC

The present invention relates to the technical field of detection and analysis, and in particular to a method for determining the chromatographic purity of 2,4,6-trimethylbenzenesulfonyl chloride by utilizing HPLC. The method comprises the following conditions: a stationary phase is an octadecylsilane bonded phase, a mobile phase comprises a mobile phase A and a mobile phase B, the mobile phase A is a potassium dihydrogen phosphate buffered saline solution, and the mobile phase B is acetonitrile; the method can effectively separate 2,4,6-trimethylbenzenesulfonyl chloride, mesitylene, and a hydrolysis impurity 2,4,6-trimethylbenzenesulfonic acid in a 2,4,6-trimethylbenzenesulfonyl chloride product, has high separation degree and high sensitivity, does not generate interfering impurities, and can accurately determine the purity of the 2,4,6-trimethylbenzenesulfonyl chloride in the product.
Owner:HANGZHOU GUORUI BIO TECH CO LTD

Purifying antibodies

Disclosed here includes a method for purifying a biologic composition, comprising diafiltering the biologic composition into a composition comprising phosphate buffered saline (PBS) to obtain a purified composition. The method disclosed here can be particularly useful for removing one or more impurities from the biologic composition, such as bis(2-hydroxyethyl)amino-tris(hydroxymethyl)methane (Bis-tris).
Owner:UNITED THERAPEUTICS CORP +1

Method of preparing FeMnCeOx biomaterial and method of treating antibiotic wastewater

ActiveUS12673885B2BiotechnologyCerium nitrate
A method of preparing a FeMnCeOx biomaterial is provided, including the following steps. A Pseudomonas sp. strain KW-2 is obtained. A culture medium with a pH of 6.5-7.8 is prepared, which includes 0.1 g / L K2HPO4, 0.2 g / L MnSO4·7H2O, 0.2 g / L NaNO3, 0.1 g / L CaCl2), 0.1 g / L NH4Cl, 0.1 g / L (NH4)2CO3, 35 g / L NaCl and 150 mg / L ferric ammonium citrate. The culture medium is autoclaved, inoculated with the KW-2 strain, cultured for 1-3 days, added with a cerium nitrate solution, cultured for 3-7 days and centrifuged at 4,000-8,000 rpm for 10-20 min to collect a precipitate. The precipitate is rinsed 5-8 times with deionized water and 0.01 mol / L phosphate buffered saline (PBS) and freeze-dried at −60° C. to obtain the FeMnCeOx biomaterial. A method for treating antibiotic wastewater using the FeMnCeOx biomaterial is also provided.
Owner:QINGDAO UNIV OF TECH

Platelet lysate-based microparticles, methods and uses thereof

PendingUS20260035423A1TransferrinsSerum albuminPhosphate buffered salineBiomedicine
The present disclosure relates to a process to assemble proteins derived from platelet lysates in bioactive microparticles, with increased surface organization. The present invention further relates to protein-based biomaterials applicable to biomedical and biotechnology fields, more precisely in tissue engineering strategies, disease modeling, and other biomedical applications. Namely, a method for obtaining a protein microparticle from a platelet lysate comprising the following steps: lyophilizing the platelet lysate; dissolving the lyophilized platelet lysate in phosphate buffer saline to obtain a platelet lysate solution; adding a reducing agent to the platelet lysate solution to obtain a reduced platelet lysate solution; adding an oxidizing agent to the reduced platelet lysate solution to form the microparticles by precipitation.
Owner:UNIV AVEIRO

Preparation and application of visible light crosslinking composite gel type hemostatic dressing

The present application provides a visible light crosslinking composite gel type hemostatic dressing, comprising 1-55% methacrylated natural polymer, 0.0001-0.05% visible light initiator, 2-15% thickening agent; the method for preparing the hemostatic dressing comprises the following steps: firstly, preparing a visible light initiator solution, and dissolving the methacrylated natural polymer with the visible light initiator solution to obtain solution A; dissolving the thickening agent with deionized water or a phosphate buffered saline solution to obtain solution B; uniformly mixing solution A and solution B to obtain the visible light crosslinking composite gel type hemostatic dressing. The present application (1) is suitable for first aid hemostasis; (2) is solidified under visible light irradiation and closely adheres to the wound tissue; (3) has good adhesion, flexibility and moisturizing property after being solidified under visible light irradiation, and has a certain healing promotion effect.
Owner:GENERAL HOSPITAL OF PLA

Preparation method of soybean seed coat polysaccharide encapsulated essential oil liposome antibacterial agent

The invention discloses a preparation method of a soybean seed coat polysaccharide encapsulated essential oil liposome antibacterial agent, which comprises the following steps: uniformly dispersing soybean lecithin (20mg / ml), stigmasterol (4mg / ml) and essential oil (1%) in absolute ethyl alcohol, carrying out rotary evaporation at 45 DEG C until a uniform lipid film is formed in a bottle, transferring into a vacuum drying oven, and further drying and removing ethyl alcohol; the method comprises the following steps: carrying out ultrasonic treatment on a liposome sample, hydrating by using a phosphate buffer solution (PBS, 0.01 mol / l, pH of 7.2-7.4) containing Tween-80, and carrying out ultrasonic treatment for 10 minutes under the power of 200W to obtain the liposome sample; uniformly mixing the soybean seed coat polysaccharide solution (0.01%-0.2%) with the liposome solution according to the volume ratio of 1: 1, and stirring for 1 hour to obtain a soybean seed coat polysaccharide encapsulated liposome solution; the slow-release antibacterial agent prepared by the preparation method disclosed by the invention has excellent slow-release effect and antibacterial property, and the preparation method is simple to operate and low in cost.
Owner:BOHAI UNIV

Nanofiber composite hydrogel gastrointestinal patch and method of making same

The application relates to the technical field of medical biomaterials, in particular to a nanofiber composite hydrogel gastrointestinal patch and a preparation method thereof, which comprises the following steps: dissolving polycaprolactone in trifluoroethanol to obtain solution A; dispersing T-5224 in the solution A, uniformly mixing and then performing electrospinning to obtain a nanofiber membrane; adding carboxymethyl chitosan into a phosphate buffered saline solution, stirring until completely dissolved to obtain an A-component solution; sequentially adding sodium alginate oxide and tannic acid into the phosphate buffered saline solution, stirring until completely dissolved to obtain a B-component solution; mixing the A-component solution and the B-component solution in proportion, uniformly stirring, then smearing the mixture on the surface of the nanofiber membrane, and standing until the hydrogel is formed to obtain the nanofiber composite hydrogel gastrointestinal patch. In the application, the nanofiber membrane is used as a substrate, the hydrogel coating layer is crosslinked to form a stable three-dimensional network structure, and the mechanical property of the overall patch can meet the support requirement in the gastrointestinal repair process.
Owner:THE FIRST AFFILIATED HOSPITAL OF HEBEI NORTH UNIV

Polymeric nanoparticles for long acting delivery of a peptide and methods of making and using thereof

Disclosed herein are polymeric nanoparticles containing peptides, which provide low burst release and sustained, delivery of the peptides, and pharmaceutical compositions thereof. The polymeric nanoparticles contain a peptide encapsulated or dispersed therein. The nanoparticles can provide sustained release of the peptide, for example, less than 20% of the peptide is released initially (at time 0 hour) following placement into a phosphate buffered saline at pH 7.4 at 37° C. and room pressure. Methods for micronizing a peptide and for preparing polymeric nanoparticles containing solid, micronized peptides are also disclosed. The preparation methods use miscible solvent and non-solvent pairs in phase inversion nanoencapsulation processes. The Gibbs energy of mixing (ΔGMix) between the solvent and non-solvent can be tailored to achieve desired particle size, encapsulation efficiency, and release profile.
Owner:BROWN UNIVERSITY

Bionic nano melanin protective agent with photo-thermal responsiveness and ultraviolet-visible light dual-band protection function as well as preparation method and application of bionic nano melanin protective agent

The invention belongs to the technical field of fine chemicals, and provides a bionic nano melanin protective agent with photo-thermal responsiveness and an ultraviolet-visible light dual-band protection function as well as a preparation method and application of the bionic nano melanin protective agent. The preparation method comprises the following steps: mixing dopamine hydrochloride with a Tris buffer solution for reaction, and then carrying out light-shielding reaction with a tris (hydroxymethyl) aminomethane hydrochloride solution and sulfydryl polyethylene glycol to obtain PDA-coated PEG nanoparticles; the preparation method comprises the following steps: mixing Pluronic F-127 with phosphate buffered normal saline, and reacting to obtain PF-127 hydrogel; and mixing the PF-127 hydrogel with the PDA-coated PEG nanoparticles, and carrying out a light-shielding reaction, so as to obtain the bionic nano melanin protective agent with photothermal responsiveness and an ultraviolet-visible light dual-band protection function. The method is simple, green and environment-friendly, and the obtained protective agent has photo-thermal response performance and a lasting and safe sunscreen effect and has good application potential in the aspect of cold skin disease protection.
Owner:FOURTH MILITARY MEDICAL UNIVERSITY

Treatment method for strengthening active ingredients of medicinal and edible medicinal materials

The invention discloses a treatment method for strengthening active components of medicinal and edible medicinal materials, which comprises the following steps: adding a phosphoric acid buffer salt solution and cellulose compound enzyme into medicine residue thick slurry, carrying out enzymolysis reaction for 2-8 hours in an acid environment of 45-55 DEG C by adopting ultrasonic oscillation, and collecting enzymatic hydrolysate; or performing particle crushing and homogenizing treatment by using the pressure of 30-60MPa, performing 2-10 times of volume circulation treatment capacity, performing oscillation treatment on the cell crushing liquid by using 30-80W ultrasonic waves, and collecting filtrate; performing differential centrifugation on the enzymatic hydrolysate or / and the filtrate to obtain an exosome solution; and adding the exosome solution into the concentrated original liquid medicine, and stirring and heating at 80-90 DEG C for 30-60 minutes. Residual cell exosomes are extracted from medicine residues of medicinal and edible medicinal materials and added into original Chinese herbal medicine liquid, Maillard reaction is carried out through heat treatment, and the oxidation resistance of the raw medicinal materials can be improved by 15% or above.
Owner:SHANGHAI GENLAI FOOD CO LTD

Tannic acid-enhanced anisotropic polyvinyl alcohol hydrogel, and preparation method and application thereof

PendingCN122277941AEpitheliumFreeze-drying
This invention discloses a tannic acid-reinforced anisotropic polyvinyl alcohol hydrogel, its preparation method, and its applications. The preparation method of the hydrogel includes: subjecting the polyvinyl alcohol hydrogel to sequential mechanical stretching, salting-out fixation, freeze-drying, and annealing to construct an anisotropic structure, followed by immersion in a tannic acid solution for reinforcement. The hydrogel exhibits high crystallinity, excellent mechanical properties, and an extremely low equilibrium swelling rate, with a swelling rate of only 4.8% in phosphate buffered saline. The introduction of tannic acid endows the hydrogel with broad-spectrum antibacterial, antioxidant, and anti-inflammatory functions. The anisotropic structure, in conjunction with tannic acid, can significantly promote the directional migration of endothelial cells, angiogenesis, and the orderly regeneration of epithelium and smooth muscle. Animal experimental results show that this hydrogel can effectively reduce the recurrence rate of urethral stricture and achieve scarless functional repair.
Owner:HAINAN UNIV +1

GelMA hydrogel loaded with acellular fat extract and flap survival application

PendingCN121731547AProsthesisTube formationCell free
The invention discloses cell-free fat extract loaded GelMA hydrogel and skin flap survival application, and particularly relates to the technical field of biomedical engineering. The hydrogel is prepared from GelMA, Ceffe, lithium phenyl (2, 4, 6-trimethylbenzoyl) phosphonate and a phosphate buffer salt solution. Wherein the Ceffe is rich in a plurality of angiogenesis promoting factors and is obtained through physical emulsification and centrifugal extraction; gelMA is prepared by modifying pig A-type gelatin through methacrylic anhydride, and has temperature-sensitive and photo-crosslinking characteristics. The injectable hydrogel with a porous network structure is formed by mixing Ceffe and a GelMA solution and curing through ultraviolet irradiation. The compound system realizes Ceffe biphasic slow release, remarkably promotes proliferation, migration and tube formation of vascular endothelial cells in vivo and in vitro, improves the survival rate of random skin flaps of mice, and effectively relieves oxidative stress injury caused by ischemia reperfusion by up-regulating HO-1 and down-regulating INOS.
Owner:AFFILIATED PEOPLES HOSPITAL OF NINGBO UNIV

Preparation method of nano hydrogel for reversing active oxygen and improving skin aging

The invention discloses a preparation method of nano hydrogel for reversing active oxygen and improving skin aging, and relates to the technical field of cosmetics, and the preparation method comprises the following steps: step 1, stirring and reacting dextran and sodium periodate in phosphate buffered saline water in a dark place at normal temperature to obtain oxidized dextran; 2, beta-cyclodextrin CD-NH2 is dissolved in PBS, and the two solutions are heated and stirred for a reaction; 3, ROS response groups and matrix metalloproteinase response polypeptides are added and stirred, and a mixture solution is obtained; 4, dissolving the drug astaxanthin in an organic solvent, adding the drug astaxanthin and tranexamic acid into the mixed solution for loading, and dialyzing at room temperature; and 5, sequentially extruding the solution on a PC film for multiple times by using a liposome extruder to obtain the nano hydrogel with ROS response performance. The problems that an existing formula is poor in stability, low in transdermal absorption rate and insufficient in synergistic effect are solved.
Owner:HANGZHOU RUIBOER BIOTECHNOLOGY CO LTD

A composite preservative for fecal microorganisms and metabolites thereof and a simultaneous multi-omics integrated detection technology

The application provides a composite preservative for fecal microorganisms and metabolites thereof and a same-tube multi-omics joint detection integrated technology. The composite preservative contains main components of cetyltrimethylammonium bromide (CTAB), ammonium chloride (NH4Cl) and phosphate buffered saline (PBS), can keep the stability of microorganisms and metabolites thereof in a fecal sample during storage and transportation at room temperature, and guarantees the extraction efficiency of deoxyribonucleic acid (DNA) of the microorganisms in the fecal sample. The application also eliminates the influence of the preservative components on metabolite detection by adding a treatment reagent, significantly improves the response and ionization efficiency of the fecal sample metabolites in mass spectrometry, and thus improves the sensitivity and accuracy of the detection results. The application not only solves the timeliness problem of fecal sampling, but also provides a technical basis and idea for the feasibility study of the same-tube multi-omics of the fecal sample, and has a broad research and clinical application prospect.
Owner:ZHEJIANG UNIV

Marine polysaccharide vector-based anthocyanin nanoparticles, and preparation method therefor and application thereof in targeted delivery

The disclosure provides marine polysaccharide vector-based anthocyanin nanoparticles, using marine polysaccharides, food-borne fluorescent nanoparticles and sodium hyaluronate as a composite vector to be combined with anthocyanin, and is prepared by a method: S1, dissolving sodium alginate in phosphate buffered saline, and successively adding EDC, HOBt and the food-borne fluorescent nanoparticles to obtain a fluorescence-alginate complex; S2, adding the fluorescence-alginate complex into a mixture of DMF and DCM, and then adding DIC and DMAP; S3, adding the anthocyanin and hyaluronic acid, and then removing a solvent; and S4, removing unreacted small molecules, and carrying out freeze drying.
Owner:DALIAN POLYTECHNIC UNIVERSITY

Antigen and kit for detection of Helicobacter pylori antibody, and preparation method thereof

A kit for the detection of Helicobacter pylori antibody in an oral exudate is provided. The kit includes an antigen and a diluent for diluting the oral exudate. The antigen is Helicobacter pylori HpC-025 with the deposit registration number of CCTCC No: M20221024. The diluent contains phosphate buffered saline (PBS), casein, surfactant Tetronic 1307, and surfactant RHODASURF® ON-870. The kit may also include, a sampling swab, a collection tube, a plate cartridge, and a test strip with a binding pad bound with latex microspheres labeled with the Helicobacter pylori HpC-025 antigen.
Owner:SHANG OUTDO BIOTECH CO LTD

Calmodulin electrochemical biosensor based on laser-induced graphene as well as preparation method and application of calmodulin electrochemical biosensor

The invention discloses a calmodulin electrochemical biosensor based on laser-induced graphene as well as a preparation method and application of the calmodulin electrochemical biosensor, and belongs to the technical field of electrochemical biosensors. The preparation method comprises the following steps: S1, depositing pyrrole-1-propionic acid on the surface of a laser-induced graphene electrode, and then dropwise adding a chlorinated 4-(4, 6-dimethoxy-1, 3, 5-triazine-2-yl)-4-methylmorpholine solution; s2, dropwise adding a phosphate buffer salt solution of target protein on the surface of the electrode deposited with pyrrole propionic acid, washing after incubation, drying, and dropwise adding a bovine serum albumin solution; and S3, dropwise adding a phosphate buffer salt solution of a protein antibody on the surface of the target protein modified electrode, incubating, washing, drying, dropwise adding a horse radish peroxidase labeled immune globulin solution, incubating, washing, and drying to obtain the calmodulin electrochemical biosensor. The sensor prepared by the method disclosed by the invention has relatively good stability and reproducibility while showing immediate, rapid and high-sensitivity detection.
Owner:WUHAN UNIV

Method for separating CD34 + hematopoietic stem cells from umbilical cord blood

According to the method for separating the CD34 < + > hematopoietic stem cells from the umbilical cord blood, the nonspecific clearance rate of the CD34 < + > cells is reduced by reducing the dosage of a RosetteSep antibody; the ratio of the RosetteSep antibody to the CD34 positive antibody to the magnetic beads is optimized; the albuginea layer containing CD34 + cells and a part of density gradient centrifugate below the albuginea layer are absorbed in a whole interval, and loss of CD34 + hematopoietic stem cells is avoided; determining the standardized dilution ratio of the phosphate buffer saline, and eliminating the influence of the lymphocyte separation medium with high buoyancy density on the sedimentation separation of the stem cells; the centrifugal rate after the phosphate buffer saline is diluted and the acceleration of speed increase and speed reduction in the centrifugal process are optimized, so that complete precipitation of CD34 + cells is ensured, and mechanical damage is reduced; and multiple measures are coordinated and matched, so that the separation efficiency of the CD34 + hematopoietic stem cells is improved, the purity is improved, and the separation cost is reduced.
Owner:SHANDONG UNIV +1

Separation and determination method of esculentin hydrochloride intermediate K5 and related impurities thereof

The invention belongs to the technical field of pharmaceutical analysis, and particularly relates to a separation and determination method of an esculentin hydrochloride intermediate K5 and related impurities thereof. The impurities comprise one or more of S-tert-butyl sulfinamide, an impurity K4a, an impurity K4, benzyl chloride, an impurity K3 and toluene. The method comprises the following steps: a chromatographic column adopts octadecylsilane chemically bonded silica as a filler, a mobile phase comprises a mobile phase A and a mobile phase B, and the mobile phase A and the mobile phase B are both mixed solutions of a phosphoric acid buffer salt solution and acetonitrile; in the mobile phase A, the volume ratio of the phosphoric acid buffer salt solution to the acetonitrile is (50-70): (50-30); in the mobile phase B, the volume ratio of the phosphoric acid buffer salt solution to the acetonitrile is (20-40): (80-60); separating through linear gradient elution, then detecting in a detector to obtain a chromatogram, and calculating the content of each impurity by adopting an external standard method. The method has the characteristics of good separation degree, good durability, high sensitivity and good reproducibility.
Owner:CHONGQING HUAPONT PHARMA

Methods for evaluating cardiac safety of drug using cardiomyocytes derived from human stem cells

A method of assessing drug cardiac safety using human stem cell-derived cardiomyocytes, includes: step (A) of preparing cardiomyocytes by culturing human stem cells to differentiate into cardiomyocytes; step (B) of diluting fibronectin in DPBS (Dulbecco's phosphate buffered saline) at a concentration of 50 μg / ml; step (C) of adding the fibronectin solution, obtained by diluting to the concentration of 50 μg / ml in step (B); step (D) of placing the MEA plate; step (E) of removing the fibronectin solution from specific wells of the MEA plate; step (F) of adding a predetermined medium to the specific wells of the MEA plate; and step (G) of measuring changes in information values about beat rate, spike amplitude and field potential duration depending on whether a drug to be assessed has been added to the wells of the MEA plate.
Owner:NEXELL CO LTD

A cell flake treating agent for improving the quality of freshwater pearl cultivation and a treating method thereof

The present invention discloses a cell flake treatment agent and a treatment method thereof for improving the quality of freshwater pearl cultivation, and relates to the field of aquaculture technology. The cell flake treatment agent is prepared with a phosphate buffered saline solution as the base solution, and the functional components include a double antibiotic solution and a plurality of growth factors; after preparing the freshwater pearl oyster cell flakes, the cell flakes are soaked in the treatment agent of the present invention for 3-5 minutes, and then the nucleus is inserted into the pearls. Using the treatment agent and treatment method of the present invention to produce freshwater pearl oyster pearls can overcome the problem of poor monoclonal antibody antibacterial effect, effectively inhibit postoperative infection, and promote wound healing; overcome the technical difficulty of slow pearl sac formation rate, accelerate pearl sac formation and improve pearl quality. The product and method of the present invention are suitable for preoperative treatment of cell flakes in freshwater pearl oyster nucleus insertion surgery, and have the characteristics of low cost, high stability and good effect.
Owner:SHANGHAI OCEAN UNIV

Preparation method and application of vesicle formed by erythrocyte membrane encapsulating Newcastle disease virus

ActiveUS20250340849A1SsRNA viruses negative-senseCell dissociation methodsNewcastle disease virus NDVCell membrane
The present disclosure proposes a preparation method of a vesicle formed by an erythrocyte membrane encapsulating Newcastle disease virus, including: mixing a compacted erythrocyte solution, a phosphate buffered saline (PBS) solution, and Newcastle disease virus (NDV); centrifuging a resulting mixture of erythrocytes added with NDV; and resuspending and precipitating the centrifuged mixture with a PBS solution to obtain the vesicle formed by the erythrocyte membrane encapsulating Newcastle disease virus.
Owner:ZHAO YONGXIANG

Cell culture carrier and method for producing cell culture carrier

The present invention pertains to a cell culture carrier containing a halogen and a polymer having a hydroxyl group. The halogen content of the cell culture carrier measured by X-ray photoelectron spectroscopy is 3-60 atom%, and the saturation content of the polymer by phosphate buffered saline (PBS (-)) at 25°C is 10-99 mass%.
Owner:KURARAY CO LTD

High biocompatibility hydrogel based on enzyme catalyzed crosslinking and preparation method thereof

PendingCN122140953ASignificant synergistic enhancement effectPrecise control of mechanical propertiesMetabolism disorderPeptide/protein ingredientsTyrosineTyrosinase
The application relates to the technical field of biomaterials, and discloses a high-biocompatibility hydrogel based on enzyme catalysis cross-linking and a preparation method thereof, which comprises the following steps: mixing a polypeptide mother liquor containing a tyrosine residue, functional nanoparticle tyrosinase and an MES buffer solution to obtain precursor solution A; mixing gelatin, recombinant elastin and a phosphate buffered saline solution to obtain a polymer mother liquor, and adding microbial transglutaminase into the polymer mother liquor to obtain precursor solution B; and mixing and reacting the precursor solution A and the precursor solution B to obtain the high-biocompatibility hydrogel based on enzyme catalysis cross-linking. In the application, the interpenetrating network constructed by the tyrosinase and the microbial transglutaminase sequentially catalyzes a significant synergistic enhancement effect. In a hyperglycemic environment, a mesoporous silica nanoparticle built-in level connection system is automatically activated, realizing multiple effects of antibiosis, anti-inflammation and promotion of angiogenesis.
Owner:CHINA AGRI UNIV