62 results about "Linaclotide" patented technology

The invention relates to the field of pharmaceutical synthesis and discloses a linaclotide synthesis method. The linaclotide synthesis method includes: performing solid-phase synthesis to obtain linaclotide resin with an N terminal, a Thr side chain, a Cys side chain, an Asn side chain, a Tyr side chain and a Glu side chain of an amino acid sequence shown in SEQ ID NO:1 coupled with protecting groups and with a C terminal coupled with a resin solid-phase carrier, cracking to remove the protecting groups and the resin solid-phase carrier prior to carrying out oxidizing reaction by the aid of a GSH (glutathione)/GSSH (oxidized glutathione) oxidization system to obtain a crude linaclotide product, and purifying the crude linaclotide product so that linaclotide is obtained. By the method, an Mmt protecting group is used for protecting a cysteine side chain, crude linear linaclotide peptide is synthesized by a one-by-one coupling mode, and the linaclotide is obtained by oxidization by the aid of the GSH /GSSH oxidization system. Compared with existing methods, the linaclotide synthesis method has the advantages that purity of the crude linear peptide is improved, the oxidization step can be performed without purification, and purity and yield of the crude linaclotide product are remarkably improved.

Belonging to the technical field of pharmaceutical synthesis, the invention discloses a preparation method for linaclotide. During synthesis of linear peptides, the carrier resin adopts Wang Resin, which has stable nature relative to chlorine resin and makes peptide difficult to fall off. Meanwhile, during synthesis of linear peptides, five of six cysteines in a peptide sequence adopt relatively cheap Fmoc-Cys(Trt)-OH as the reaction raw material, thus greatly reducing the synthesis cost and being beneficial to industrial production. In addition, during formation of three disulfide bonds, the one-step oxidation method is employed to oxidize crude peptide directly so as to form correctly paired three disulfide bonds. The method has the advantages of simple and practical operation, high yield and low cost, and is in favor of industrial production. The linaclotide prepared by the method provided by the invention can have a linear crude peptide weight yield up to 103.9%, purity up to 82.9%, refined peptide purity stabilized at 99.12-99.30%, and a total yield up to 32.15%.

The invention discloses a linaclotide solid-phase synthesis method, and belongs to the biochemical technical field. The method includes the following steps: (1) preparation of linaclotide resin; (2) cutting the linaclotide linear peptide resin obtained in the step (1), to obtain a protection group linear peptide containing Cys(Acm) and Cys(tBu); (3) oxidizing to form a first disulfide bond, to obtain a monodisulfide cyclopeptide; (4) removing an Acm protection group in the monodisulfide cyclopeptide, to obtain a dual disulfide cyclopeptide; (5) removing a tBu protection group of the dual disulfide cyclopeptide, to obtain a trisdisulfide cyclopeptide; and (6) purifying the trisdisulfide cyclopeptide by HPLC, and freeze-drying to obtain linaclotide. The process has the characteristics of simple reaction operation, easy post-processing, low cost, high yield, and considerable economic and practical values, and besides, has wide application prospect in the polypeptide drug design and synthesis field.

The invention discloses a method for improving the stability of polypeptide active pharmaceutical ingredients. The polypeptide active pharmaceutical ingredients comprise but are not limited to bivalirudin, octreotide acetate, lanreotide acetate, eptifibatide or cetrorelix acetate, ganirelix acetate, degarelix, liraglutide, oxytocin, thymosin alpha1, leuprolide acetate, goserelin acetate, terlipressin or linaclotide. The method comprises the steps that after polypeptide drugs are salified, a polypeptide solution containing compensation ions is obtained, and a target polypeptide product is prepared through an ultralow temperature vacuum freeze-drying method. According to the method for improving the stability of the polypeptide active pharmaceutical ingredients, the problem that the polypeptide active pharmaceutical ingredients are prone to degradation after being placed for a long time is solved, the uniformity of the product is improved, and the drug risk is reduced.

The invention provides a preparation method for linaclotide. The method includes: utilizing a standard Fmoc technology to connect a side chain protected amino acid with Wang resin, adding a condensing agent HBTU and alkali DIPEA, carrying out condensation reaction in a DMF solvent, employing a DMF solution containing 20% hexahydropiperidine to perform de-Fmoc protection, then conducting cutting from the solid phase resin, adding elemental iodine into a sodium phosphate buffer solution to carry out Cysteine oxidation, thus obtaining linaclotide. The preparation method for linaclotide provided by the invention is the technology for highyield synthesis of linaclotide, simplifies the cyclization process and enhances the cyclization yield, and the final product yield reaches 30%-60%. The preparation method has the advantages of simplicity, mild reaction conditions, high yield, and high product purity, is a feasible preparation method for industrialization of linaclotide, and provides good prospects for industrial production.

The invention relates to the field of medicinal synthesis and discloses a method for synthesizing linaclotide. The method comprises the following steps: synthesizing a linaclotide resin coupled with protecting groups on side chains Thr, Cys, Asn, Tyr and Glu of an amino acid sequence shown as SEQ ID NO:1 and coupled with a resin carrier at the terminal C; performing acid hydrolysis to remove the protecting groups and resin carrier, obtaining a linaclotide linear crude peptide, cyclizing the linear crude peptide by adopting a cysteine/DMSO buffer solution, obtaining a crude linaclotide product, purifying and converting the crude product into acetate, thereby obtaining the finished product. According to the method disclosed by the invention, starting from a cyclizing system, the linaclotide synthesis method is improved, the total yield of linaclotide is improved by a stage by virtue of simple and rapid process steps, and the purity can reach a high level. Meanwhile, the later-stage cyclizing time is greatly shortened, and compared with the prior art, the method has high practical value and application prospects.

Solid, stable formulations of linaclotide suitable for oral administration are described herein as are methods for preparing such formulations. The formulations described herein contain a polypeptide consisting of the amino acid sequence Cys Cys GIu Tyr Cys Cys Asn Pro Ala Cys Thr GIy Cys Tyr ("linaclotide") or a pharmaceutically acceptable salt thereof. The linaclotide formulations described herein are stable and have a sufficient shelf life for manufacturing, storing and distributing the drug.

The invention belongs to the technical field of biochemical polypeptide synthesis and relates to a method for preparing linaclotide. The method mainly solves the problem that the existing synthesis method has complicated steps of synthesis, high raw material cost, long synthesis period, low yield and more impurity and is unsuitable for industrial production. The method comprises that (1) Fmoc-Tyr(tBu)-OH and a carrier resin undergo a reaction to produce Fmoc-Tyr(tBu)-resin, (2) the Fmoc-Tyr(tBu)-resin and other amino acids with Fmoc protecting groups are coupled one by one through an activator so that linaclotide linear peptide resin is obtained, (3) the linaclotide resin is subjected to deprotection and cracking agent-based cracking to form linaclotide linear peptide, (4) three disulfide bonds of the linaclotide linear peptide is cyclized in an ammonium hydroxide/DMSO system to form linaclotide crude peptide, and (5) the linaclotide crude peptide is purified in an alkaline buffer solution and then is subjected to freeze-drying so that pure linaclotide is obtained.

The present invention relates to orally disintegrating or dissolving pharmaceutical compositions comprising linaclotide or pharmaceutically acceptable salts thereof, as well as to various methods and processes for the preparation and use of the compositions.

The invention relates to the field of pharmaceutical synthesis, and discloses a synthetic method for linaclotide. The method uses a solid phase one-step cyclization method to prepare linaclotide, andthe linaclotide linear peptide resin is directly cyclized by a N-X-substituted succinimide solution oxidation system without cleavage to obtain linaclotide resin, the resin is cleaved, purified and lyophilized to give linaclotide. The N-X-substitured succinimide is one of N-chlorosuccinimide, N-bromosuccinimide, N-iodosuccinimide, and N-hydroxy thiosuccinimide. The method has the following advantages that: 1) solid phase cyclization is adopted, firstly, the pseudo-dilution effect is achieved, repeated folding of the peptide chain is avoided, and the cyclization reaction can be carried out at ahigher concentration, which can greatly improve the production efficiency; secondly, the linear peptide resin is not cleaved before cyclization, avoiding the production of a large amount of impurities and improving the efficiency of linaclotide cyclization; 2) one-step cyclization using N-X-substituted succinimide can avoid multi-step purification of the intermediates, reduce the composition of the intermediate purification step, and improve the total yield of linaclotide; and 3) a specific amino acid side chain protecting group is adopted, thus positioning a pair of disulfide bonds in the cyclization process, reducing the formation of mismatch by-products, improving the purity of linaclotide, greatly improving production efficiency, and reducing the manufacturing cost.

The present invention relates to a process for the preparation of Linaclotide by oxidizing linear Linaclotide of formula (II) using combination of air and oxidizing agent followed by purification using RP-HPLC.

The invention discloses a method for preparing Linaclotide. The method includes the step: performing oxidation reaction for Linaclotide intermediates containing two pairs of disulfide bonds to obtain the Linaclotide. The Linaclotide intermediates containing the two pairs of disulfide bonds are disulfide bonds with second Cys (cysteine) and tenth Cys and disulfide bonds with fifth Cys (cysteine) and thirteenth Cys. According to the method, a reaction route is short, raw materials are low in cost and easy to obtain, reaction conditions are mild, energy consumption is reduced, and production cost is reduced. Compared with a route published by a predecessor, the route is high in reaction selectivity and conversion rate, waste of the raw materials is decreased, and the route has high economy. According to the method, optimal reaction time is 30min, the purity of prepared products can reach 85%, and discharge of waste gas, waste water and solid waste is decreased, and the method is green and safe.

The present invention relates to delayed release pharmaceutical compositions comprising linaclotide or pharmaceutically acceptable salts thereof, as well as to various methods and processes for the preparation and use of the compositions.

The present invention relates to an improved process for the preparation of Linaclotide of Formula I. The process disclosed in the present invention is simple, economical and eco-friendly with reduced reaction times.

The invention relates to the field of polypeptide synthesis, in particular to a method for preparing linaclotide through solid-liquid combination, thereby well avoiding the generation of impurity peptides, improving the purity of crude peptides and reducing the production cost. According to the preparation method disclosed by the invention, the linaclotide is synthesized by adopting dipeptide monomers Fmoc-Gly-Cys (tButhio)-OH and Fmoc-Pro-Ala-OH for the first time in a solid phase manner; meanwhile, a strategy of protecting cysteine sulfydryl by stable tButhio under a TFA cracking condition is introduced, so that the purity of the linear peptide can be effectively improved, the yield of a final product is improved, the amplification of a synthesis scale is facilitated, and the productioncost is reduced.

The invention mainly relates to a linaclotide purifying method and belongs to the technical field of bioseparation. According to the linaclotide purifying method, an ion exchange chromatography method and a high-performance liquid chromatography method are combined, an anion exchange column is adopted as a stationary phase, a Tris HCl buffering solution is adopted as a mobile phase A, a NaCl-contained Tris-HCl buffering solution is adopted as a mobile phase B, a gradient eluting method is adopted to treat a crude linaclotide solution, eluate is subjected to desalination and acetate changing by means of the high-performance liquid chromatography method, a C18 column is adopted as a separating medium, after a sample is loaded, gradient elution is performed by adopting an aqueous acetic acid solution as the mobile phase A and acetonitrile as the mobile phase B, and eluate is subjected to freeze-drying to obtain pure linaclotide. The linaclotide purifying method is simple to operate, low in separation cost, high in yield and suitable for large-scale linaclotide production; purity of the obtained pure linaclotide can reach to above 99%, so that the obtained pure linaclotide is low in impurity content and has favorable economic and practical values and an extensive application prospect.