38 results about "Cefquinome" patented technology

A novel 4-halo-2-oxyimino-3-oxo butyric acid-N,N-dimethyl formiminium chloride chlorosulfate of formula (I) useful in the preparation of cephalosporin antibiotics

wherein

X is chlorine or bromine; R is hydrogen, C_1-4 alkyl group, an easily removable hydroxyl protective group, —CH₂COOR₅, or —C(CH₃)₂COOR₅, wherein R₅ is hydrogen or an easily hydrolysable ester group. The compound of formula (I) is prepared by reacting 4-halo-2-oxyimino-3-oxobutyric acid of formula (IV¹),

wherein X, R and R₅ are as defined above, with N,N-dimethylformiminium chloride chlorosulphate of formula (VII)

in an organic solvent at a temperature ranging from −30° C. to −15° C. The cephalosporins that may be prepared from the intermediate include cefdinir, cefditoren pivoxil, cefepime, cefetamet pivoxil, cefixime, cefmenoxime, cefodizime, cefoselis, cefotaxime, cefpirome, cefpodoxime proxetil, cefquinome, ceftazidime, cefteram pivoxil, ceftiofur, ceftizoxime, ceftriaxone and cefuzonam.

The invention belongs to the technical field of veterinary drugs. The invention discloses a veterinary drug of cefquinome microspheres serving as a lung-targeted preparation prepared by using cefquinome as a raw material and a preparation method thereof. The cefquinome is used as the raw material and gelatin is used as a carrier to form micropheres, and the ratio of the cefquinome to the gelatin is 1:2. The preparation method comprises the following steps: firstly, dissolving the cefquinome in a solution of the gelatin, uniformly mixing the cefquinome and the solution of the gelatin; secondly, dripping the mixed solution in sorbitanmonooleate and liquid paraffin and uniformly stirring the mixture till the mixture turns milky white; quickly cooling the mixture to below 5 DEG C in an ice bath, adding glutaric dialdehyde in form of thin flow, and continuing stirring for cross linking and curing; dehydrating the product obtained with isopropanol, and performing stirring and suction filtration; and washing the dehydrated product with a small amount of isopropanol and ether to remove the glutaric dialdehyde completely, washing away the liquid paraffin on the surface of the microspheres with petroleum ether and drying the microspheres at room temperature and under vacuum to obtain the cefquinome microspheres. The preparation effectively improves tissue selectivity of drug, slows drug release, improves treatment effect, reduces toxic and side effects, and achieves slow release, long-lasting effect and targeting.

Cefquinome liposome, which belongs to the field of pharmaceutics, has a particle size of less than 1000 nm, and is mainly prepared from the following raw materials by weight: 1 part of cefquinome, 1-40 parts of phospholipid, 0-15 parts of sterol or soy isoflavone glucoside or soyasapogenol, and 0-15 parts of additives. The cefquinome liposome can be prepared into a liquid preparation, and can also be prepared into a solid preparation by adding a proper amount of a support agent. The cefquinome liposome or cefquinome long circulating liposome prepared in the invention contains no irritant substances, and can relieve anaphylactic reaction; the obtained preparation has good stability, has an average liposome particle size of less than 1000 nm, and has encapsulation efficiency of more than 80%. The preparation method is mature in process, simple, practical, and suitable for industrial production.

The invention relates to a method for detecting cefquinome residual quantity in milk through ultra-high performance liquid chromatography-electric spraying tandem mass spectrometry. A technological method is supplied for monitoring the cefquinome residual quantity in milk.

The invention discloses cefquinome liposome. The cefquinome liposome comprises the following raw materials by weight: 0.01-50% of cefquinome or a salt thereof, 10-99.99% of phospholipid, 0-65% of cholesterol, 0-60% of deoxysodium cholate, 0-89.99% of anionic lipid, and 0-40% of an antioxidant. The invention further discloses a preparation method of the liposome. The cefquinome liposome researched by the invention has the advantages of excellent packaging rate, uniform particle size distribution, achievement of intravenous injection or local application standards, excellent stability and further improvement of stability through preparation of freeze-dried products. Moreover, the blank liposome-ammonium sulfate gradient medicine carrying preparation technique adopted by the invention is very suitable for large-scale industrial production, and has a wide industrialization prospect.

The invention relates to the technical field of veterinary drugs, and particularly relates to a veterinary drug of cefquinome bletilla striata bioadhesive slow-release capsule prepared by using cefquinome and bletilla striata as raw materials. An aqueous extraction and alcohol sedimentation method is adopted to extract the bletilla striata; the ratio of the cefquinome to the bletilla striata is 1:3; a 10 percent PVP ethanol solution is used as an adhesive; and the drug is made into 20 mesh grains and is filled in capsules. The contents of the cefquinome bletilla striata bioadhesive slow-release capsules can prolong the time for the detention of the drug at focuses, improve the local concentration of the drug in lesions, and have excellent bioadhesive property as well as the same drug release characteristic as a slow-release preparation.

The invention belongs to the technical field of analytical chemistry and veterinary drug residue analysis, and particularly relates to an electrochemical receptor sensor for detecting beta-lactam antibiotics, and a preparation method and application thereof. The electrochemical receptor sensor comprises an electrochemical probe, a signal probe and a novel composite nano material, the electrochemical probe is thionine, the signal probe is HRP labeled ampicillin (HRP-AMP), and the composite nano material is graphene/thionine/glassy carbon electrode (GO/TH/GCE). The method disclosed by the invention can be used for detecting cephalexin, cefquinome, ceftiofur, penicillin G and ampicillin, thereby providing a rapid and sensitive method for the detection of such substances in foods. The detection method established by the invention has high accuracy and good sensitivity, and has the advantages of saving a lot of time and cost compared with the existing method, and thus has a better market application value.

The invention belongs to the technical field of veterinary drugs and relates to livestock cefquinome colon-targeted pills. The livestock cefquinome colon-targeted pills comprise cefquinome serving as a main drug, and empty pellets are covered with a drug layer made of the cefquinome, 8 percent of a block layer made of cetanol, 2 percent of a time lag layer made of HPMC, and 15 percent of a pH sensitive film made of eudragit S100 respectively to form the livestock cefquinome colon-targeted pills. The livestock cefquinome colon-targeted pellets combining time lag and pH sensitivity can release drug at fixed positions of the colons of livestock, greatly improve the treatment effect on local infection and general infection, have low toxicity and little residue in edible animal tissues, and can be widely applied to clinic treatment of the livestock.

The invention belongs to the technical field of medicines and provides a compound cefquinome antibacterial agent. The compound cefquinome antibacterial agent comprises the effective ingredients of cefquinome and radix sophorae flavescentis aqueous extract, the dosage form is an oil-in-water type nanoemulsion, the nanoemulsion comprises the following materials in parts by weight: 1-15 parts of the radix sophorae flavescentis aqueous extract, 15-40 parts of a surfactant, 0-20 parts of a cosurfactant, 1-20 parts of cefquinome, 1-20 parts of oil, and 20-70 parts of distilled water. The nanoemulsion is uniform in distribution, transparent in system, excellent in stability, relatively low in surface tension, excellent in mobility and convenient in eating, the nanoemulsion is rapidly devoured by reticuloendothelial cells after being taken, so that the medicine takes effects quickly, the constant blood concentration and the pharmacological effect are maintained, the bioavailability of the medicine is improved, the effect of the medicine is enhanced, and the amount of the medicine used and the use times are reduced.

The invention discloses a specific anti-ceftiofur monoclonal antibody hybridoma cell strain 2E5 and the application thereof and belongs to the technical field of food safety immunodetection. The monoclonal cell strain 2E5 is preserved in the China General Microbiological Culture Collection Center, CGMCC for short, with the preservation number of CGMCC No.10873. The crude drug ceftiofur and BSA are coupled to prepare immunogen by means of the active ester method, and ceftiofur and OVA are coupled to prepare coating antigen. The specific anti-ceftiofur hybridoma cell strain is obtained after a mouse is immunized. The monoclonal antibody secreted by the cell strain only aims at ceftiofur specifically, the crossing-over rates between the monoclonal antibody and cefalexin and between the monoclonal antibody and cefquinome are 3.12% and 5.3% respectively, the crossing-over rates between the monoclonal antibody and other cephalosporin antibiotics are all smaller than 0.1%, and therefore specificity is high. The anti-ceftiofur monoclonal antibody hybridoma cell strain has high detection sensitivity and compatibility, the crossing-over rates with other cephalosporin antibiotics are low, and therefore specific detection of ceftiofur can be achieved. The invention also provides a new idea for preparing a specific antibody aiming at a specific cephalosporin so as to obtain a good specific monoclonal cell strain.

The invention discloses a composite cefquinome microsphere gel preparation and a preparation method thereof, and belongs to the technical field of medicines. The composite cefquinome microsphere gel preparation for veterinary use is prepared by adopting a spray drying method to prepare microspheres, adopting cefquinome as the medicine for the microspheres, adopting polylactic acid/polylactic acid-glycolic acid as a coating carrier material, and adopting hyaluronic acid and water as gel bases to prepare the composite cefquinome microsphere gel preparation. The microspheres are of 5-30umd in grain size, which is beneficial to lung targeting of the main medicine cefquinome, the cefquinome can easily gather at a target organ, blood clearance is reduced, long-time circulation is benefited, and pharmacological efficacy is improved. In addition, by the aid of the gel bases, contact of the medicine and interstitial fluid is reduced, the time of the medicine flowing into a bloodstream is prolonged, and a slow-release effect of the preparation is further increased.

The invention discloses a method for constructing a pharmacokinetic-pharmacodynamic (PK/PD) synchronization model of cefquinome and application thereof. The method specifically includes: detecting thedrug sensitivity of the antibacterial drug to the corresponding bacterial microorganism, and obtaining the MIC distribution range; using liquid chromatography detection method to determine the free drug concentration in the plasma samples obtained at different time points after administration of healthy and disease model animals to obtain a drug time curve; fitting the pharmacokinetic parametersof the drug by pharmacokinetic software to obtain PK parameters; studying, the antibacterial effect of antibacterial drugs on pathogenic bacteria under in vitro and semi-in vivo conditions, and obtaining PD parameters after fitting; establishing the semi-in vivo PK-PD model according to the Sigmoid Emax equation; and based on this model, using the dose calculation method and Mlxplore software to formulate different dosage regimen under the purpose of the medicine. The invention has guiding significance for the clinical application of cefquinome.

Cefquinome powder injection is characterized by comprising crystalline cefquinome, and polyethylene glycol and amino acid surfactant acting as crystal transition inhibitory auxiliaries; the mass ratioof the polyethylene glycol to the amino acid surfactant is 10:(0.5-2). A preparation method of the cefquinome powder injection includes the steps of (1) melting, to be specific, heating the polyethylene glycol to 50-65 DEG C for melting, adding the crystalline cefquinome and the amino acid surfactant, and mixing to obtain melt A; (2) cooling, to be specific, quickly cooling the melt A to solid state to obtain solid mixture B; (3) crushing the solid mixture B.

The invention discloses a compound medicament. The compound medicament comprises a main drug, which is cefquinome or salt thereof and tedizolid or phosphate thereof. The compound medicament is a breast injectant in dosage form and is used for treating mastitis of cows in the lactation period. The invention further discloses a preparation method of the compound medicament, the method comprises thefollowing steps: mixing the main drug, a stabilizing agent and a solvent uniformly, and enabling the main drug and an ingredient to be dissolved to obtain a settled solution; enabling an antioxidant,a synergist and a suspending agent to be mixed with the settled solution, and stirring uniformly; afterwards, grinding for 20-50 min by using a colloid mill to obtain a finished product. The compoundmedicament realizes a synergistic anti-microbial effect through two kinds of mechanisms in which the cefquinome or the salt thereof and the tedizolid or the phosphate thereof are jointly combined, thesynthesis of a cell wall is jointly inhibited and the synthesis of protein is inhibited. The compound medicament further has the advantages of good fluidity, good drug release performance and convenient drug administration.