66 results about "Iodixanol" patented technology

The invention provides a method for purifying iodixanol. The invention adopts a recrystallization method to purify crude iodixanol prepared from dipolymer of 5-acetamido-N,N'-bis(2,3-dihydroxypropyl)-2,4,6-triiodo isophthalamide, after several times of repeated purification, an iodixanol product qualified to Pharmacopoeia standards is obtained. The inventive purification method can be effectively used for purification of crude iodixanol prepared from dipolymer of 5-acetamido-N,N'-bis(2,3-dihydroxypropyl)-2,4,6-triiodo isophthalamide, and the used solvent has low cost, so as to remarkably reduce cost compared with the prior purification method. In addition, the inventive purification method is a non-chromatographic solvent purification method and can obtain iodixanol with high purity and high content after several times of repeated purification, so as to meet the industrial production requirements of iodixanol product, as well as Pharmacopoeia standards.

The invention relates to a composite developing thermosensitive gel embolizing agent as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing a mixed aqueous solution of an anticancer active substance, a thermosensitive material and a developing agent into composite developing thermosensitive gel; secondly, forming a composite developing thermosensitive gel embolizing agent by the composite developing thermosensitive gel and a coagulant on the scene, wherein the thermosensitive material is hydroxyl C1-4 alkyl cellulose, Pluronic, alginate or a mixture of the substances; the anticancer active substance is arsenic trioxide, docetaxel, cisplatin, carboplatin, nedaplatin, oxaliplatin, lobaplatin, miriplatin, siRNA or a mixture of the substances; the developing agent is a water-soluble developing agent of iodixanol, ioversol or iohexol and the like. The preparation method disclosed by the invention is simple and convenient, is suitable for industrial large-scale production, is particularly suitable for preparing an embolizing agent which is biodegradable and good in biocompatibility and is used for hemorrhagic diseases, and is especially suitable for preparing the composite developing thermosensitive gel embolizing agent for treating liver cancer, kidney cancer, lung cancer, prostate cancer, uterine myoma or splenic tumor and the like.

A process for the preparation of iodixanol by dimerisation of 5-acetamido-N, N'- bis(2,3-dihydroxypropyl)-2,4,6-triiodo-isophthalamide ('Compound A') in whic h, after the dimerisation step, unreacted Compound A is precipitated from the reaction mixture and recovered for re-use. The process substantially increases the net yield of iodixanol and simplifies its purification.

This invention relates generally to industrial preparation of iodixanol (1,3-bis(acetamido)-N,N′-bis[3,5-bis(2,3-dihydroxypropylaminocarbonyl)-2,4,6-triiodophenyl]-2-hydroxypropane), a non-ionic X-ray contrasting agent. It further relates to a method for preparing a crude mixture of the dimerisation reaction from 5-acetamido-N,N-bis(2,3-dihydroxypropyl)-2,4,6-triiodoisophthalamide (“Compound A”) to iodixanol for the crystallization of iodixanol. In particular, it relates to an industrial procedure of simultaneously reducing the salt content and the alcoholic dimerisation solvent using a nanofiltration system prior to the crystallization of iodixanol.

The invention discloses an improved method for preparing 3,5-disubstituted-2,4,6-triiodo aromatic amine represented by a formula (II), wherein R1 and R2 are defined in the instruction, and the compound represented by the formula (II) is a key intermediate for synthesizing iopamidol, iohexol, iodixanol and a series of non-ionic contrast agents. The method comprises: adopting a chlorine-free iodination reagent and a 3,5-disubstituted aromatic amine compound to carry out an iodination reaction to obtain the 3,5-disubstituted-2,4,6-triiodo aromatic amine represented by the formula (II), wherein a mole yield of the iodination reaction can be 89%.

The invention provides an improved synthesis method of iodixanol and macroporous adsorbent resin chromatography column purification and solvent recrystallization purification processes which are easy to be used for industrialization. In the synthesis method, iodixanol is synthesized by dimerisation of 5-acetamido-N, N'-bis(2,3-dihydroxypropyl)-2,4,6-triiodo-isophthalamide ('Compound A'), wherein hydroxyacid containing boron or borate and the like are used to form a buffer solution for controlling the pH value of a reaction process, thus side reactions such as excessive alkylation and the like are effectively inhibited and the transformation ratio for transforming into the iodixanol is improved, the crude product containing 85-90% of iodixanol is obtained and then is purified by a macroporous adsorbent resin chromatography column, the total recovery of the iodixanol is 90-95%, the purity of the iodixanol is more than 97%; and the iodixanol is subjected to recrystallization in a solvent containing 2-methoxy ethanol, the recovery of the iodixanol is 90-95%, and the purity of the iodixanol is more than 99%.

The invention relates to a fluorescent-CT bimodal imaging probe and a preparation method thereof, specifically relates to a fluorescent-CT bimodal iodine doped carbon quantum dot prepared by a one-step hydrothermal carbonization method and application of the fluorescent-CT bimodal iodine doped carbon quantum dot in biomedical images, and belongs to the field of biomedical materials. The specific scheme is as follows: dissolving iodixanol and glycine in an aqueous solution according to a certain mass ratio to serve as precursors, putting the solution in a hydrothermal reaction kettle with polytetrafluoroethylene lining, heating up to 120-200 DEG C to react for 4 hours, dialyzing and freeze drying nigger-brown reaction liquid to remove residues and water to obtain black powdery nanoparticles, namely iodine doped carbon quantum dots. The iodine doped carbon quantum dot prepared by the method has such excellent properties as stable fluorescence, efficient X-ray attenuation capacity and good biocompatibility, and is successfully applied to live cell fluorescent imaging in vitro and CT imaging in vivo. The method has the advantages of simple operation, environmental protection and easy mass production.

The invention relates to a method for separating and purifying iodixanol injection raw materials by macroporous resin. The method comprises the following steps: dissolving and synthetizing the iodixanol raw materials with water, carrying out adsorption separation and purification with PIPO-02 macroporous resin, adopting a non-linear chromatography method to perform pressing continuous chromatography, carrying out segmentation elution with ethanol, activating and recycling parting materials. The process flow is simple, the cost is low, the efficiency is high, the environment is protected, posts can be subjected to on-line activation and recycle, and the method is suitable for producing iodixanol products for injection industrially. PIPO-02 macroporous resin has remarkable advantages as compared with C-18 separating material, the cost of PIPO-02 macroporous resin is only about 20% of C-18 reverse phase silica gel, the adsorption capacity of PIPO-02 macroporous resin is about 2.5 times of C-18 separating material, the non-linear chromatography method is adopted to produce 98% iodixanol products for injection to the maximum limit, and the 98% iodixanol products have obvious advantages.

The invention discloses iodixanol and a preparation method of a synthetic intermediate 1, 3-bi (acetamino)-N, N'-bi [3, 5-bi (chloroformyl)-2, 4, 6-triiodo-phenyl]-2-propanol acetate of iodixanol. A dimerization condensation reaction of 5-acetamino-N, N'-bi (2, 3-dihydroxy propyl)-2, 4, 6-triiodo-isophthalamide as a final step is avoided by the preparation method, so that the content of iodixanol in a product is effectively improved, the purity of the obtained iodixanol crude product is greater than 90%, and the highest content of single impurity is less than 2%, so that the difficulty of purifying the product is reduced.

The present invention relates to a process method for separating and purifying iodixanol by using a macroporous adsorption resin material, comprising dissolving and synthesizing raw materials of iodixanol in water, using a PIPO-02 macroporous resin column to adsorb, separate and purify, and adopting a non-linear chromatography method, Pressurized continuous chromatography, ethanol segmental elution, and the separation material is activated and recycled. The technological process is simple, the cost is low, the benefit is high, environmental protection, the column can be activated and regenerated on-line, and it is suitable for industrial production of iodixanol products for injection. Compared with C-18 separation material, PIPO-02 macroporous adsorption resin has obvious advantages, the cost is only about 20% of C-18 reversed-phase silica gel, the adsorption capacity is about 2.5 times that of C-18 separation material, and a nonlinear layer is used Analytical method, maximum production of 98% iodixanol for injection products, has obvious advantages.

The invention provides a crystallization purification method for iodixanol. The crystallization purification method uses a simple methanol/ethanol system for recrystallization of a crude iodixanol solid product, does not use an aqueous solution of a crude iodixanol product, and unexpectedly prepares the iodixanol with less solvent residue and high purity. Meanwhile, the crystallization purification method provided by the invention has the advantages of simple operation, less time consumption, high yield, and applicability to industrial mass production.

Alternative continuous downstream processes for the production of 5-acetamido-N,N′-bis(2,3-dihydroxypropyl)-2,4,6-triiodoisophthalamide (“Compound A”) are described. Compound A is a key intermediate in the production of iodixanol and iohexol, which are two of the biggest commercially available non-ionic x-ray contrast media agents.

An improved synthesis method for preparation of iodixanol, and a purification process through macroporous adsorption resin chromatographic column and recrystallization are provided. The synthesis method relates to dimerization of 5-acetamido-N,N′-bis(2,3-dihydroxypropyl)-2,4,6-triiodo-isophthalamide (compound A) to prepare iodixanol, wherein excessive side reactions such as alkylation are effectively inhibited by controlling the pH of the reaction mixture with a boron-containing acidic substance or salts thereof such as boric acid. In this way, the conversion rate of compound A to iodixanol is 85-90%. The iodixanol crude product is purified by a macroporous adsorption resin chromatographic column, obtaining iodixanol product with recovery of 90-95% and purity of 96-98%. The iodixanol crude product is recrystallized in mixed solvent containing 2-methoxyethanol, obtaining iodixanol product with recovery of 90-95% and purity of greater than 99%.

A process for the manufacture of iodixanol by performing a crystallization process of the crude product in a solvent mixture comprising water, methanol and isopropanol. The crude product may be obtained in aqueous solution from dimerisation of 5-acetamido-N,N′-bis(2,3-dihydroxypropyl)-2,4,6-triiodo-isophthalamide (“Compound A”).

The invention belongs to the technical field of macromolecules, and discloses iodixanol and a synthesis method thereof. With a compound 5-acetamido-N, N'-bis(2, 3-dihydroxypropyl)-2, 4, 6-triiodo-isophthalamide as a raw material, an intermediate compound 5-acetamido-N, N'-bis(2, 3-dimethyl-1, 3-dioxolan-4-yl)methyl)-2, 4, 6-triiodo-isophthalamide is produced through addition of acetic acid and concentrated sulfuric acid. In allusion to the defects of the existing methods for preparing the iodixanol, through production of the novel intermediate compound, production of difficultly removed O-alkylated impurities during a reaction is avoided. The invention provides a method for synthesizing the iodixanol, which is more reasonable, higher in yield and higher in purity. By the method, the reaction cost is lower.

The invention discloses a improved process for the preparation of 3,5-disubstituted-2,4,6-triiodo aromatic amines of formula (II), wherein R1 and R2 are defined as herein. The compounds of formula (II) are the key intermediates for the synthesis of a series of non-ionic contrast agents such as Iopamidol, Iohexol and Iodixanol. The process comprises reacting chlorine-free iodinating reagents with 3,5-disubstituted-2,4,6-triiodo aromatic amines to obtain 3,5-disubstituted-2,4,6-triiodo aromatic amines of formula (II), wherein the molar yield of the iodination reaction can reach to 89%.

The invention belongs to the technical field of medicine preparations, and discloses iodixanol injection and a method for preparing the same. The iodixanol injection comprises iodixanol, sodium chloride and sodium sulphate. The method includes adding the balance water for injection into the iodixanol, the sodium chloride and the sodium sulphate to obtain mixed liquid; regulating the mixed liquid by the aid of acid until the pH (potential of hydrogen) of the mixed liquid is within an appropriate pH range. Compared with the prior art, the iodixanol injection and the method have the advantages that the types and the quantities of excipients added into the iodixanol injection are greatly reduced, the viscosity of the injection is further lowered, and accordingly the application compliance of clinical patients can be improved; as studied via high-temperature sterilization testes, low-temperature freezing and thawing experiments, irritation tests and the like, the iodixanol injection is stable in quality and low in vascular irritation, and requirements on safe medication can be completely met.

The invention discloses a method for culturing a contrast agent damage model based on renal tubular epithelial cells. The method includes the steps of: (1) conducting HK-2 cell resuscitation; (2) performing cell subculture; (3) observing the culture period cell morphology under a microscope, when the cell edge crumples become round and the refractivity is enhanced, conducting centrifugation, and adding a complete medium to make a cell resuspension solution; (4) transferring the cell resuspension solution into a complete medium according to an inoculation density of 40%-50%; (5) when the cell growth density reaches 80%-90%, performing centrifugation, adding a complete medium to prepare a cell resuspension solution (with a cell concentration of 1.0-1.5*10<6>/ml); and (6) inoculating every 40-60microl of the prepared cell resuspension solution into a 2ml complete medium, conducting culture for 40-50h, then conducting replacing with a serum-free medium and performing culture for 4-8h, thenadding a 45-55mgI/ml iodixanol solution, and further conducting culture for 5-7h, thus obtaining damage model cells. The method provided by the invention can culture the cell damage model that has similar content to contrast-induced nephropathy patient postoperative serum HMGB-1 content, closer damage and fewer system toxins.