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C1 esterase inhibitor and preparation method thereof

An inhibitor and esterase technology, applied in the field of C1 esterase inhibitor and its preparation, can solve the problems of complex production operation, many chromatographic steps, insufficient safety, etc., so as to increase output value, save plasma resources, and improve market competition. force effect

Pending Publication Date: 2022-08-02
华润博雅生物制药集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has many chromatography steps, complex production operation and high cost
[0010] However, the above-mentioned methods all have the defects of insufficient safety and high cost, so it is necessary to develop C1 esterase inhibitors with high safety and low cost

Method used

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  • C1 esterase inhibitor and preparation method thereof
  • C1 esterase inhibitor and preparation method thereof
  • C1 esterase inhibitor and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1: preparation technique is as follows:

[0057] (1) After receiving 3000L of qualified human plasma during the quarantine period, the bag will be broken under the protection of laminar flow in a D-level environment. Merge it into the melting tank with circulating water at 30~35℃ for interlayer circulation melting, and control the plasma temperature between 0~4℃. After the plasma is melted, centrifuge with a centrifuge. The centrifugal force should be 6000g~20000g. The temperature is 0℃~4℃, and the effluent flow rate should be ≤4kg / min / unit, and the cryoprecipitated plasma is collected; the cryoprecipitated plasma is transferred to the adsorption tank, and the plasma temperature is controlled at 10~20℃. Plasma pH was adjusted to 7.0 ± 0.2 using acetic acid-sodium acetate buffer (pH 4.0). 45kg of equilibrated DEAESephadex A50 gel was added and adsorbed for 30 minutes under stirring. The adsorbed gel was collected in a gel column. The gel was washed 4 times ...

Embodiment 2P

[0081] Embodiment 2Optimization of PEG precipitation conditions

[0082] 2.1 Preliminary study on PEG precipitation conditions

[0083] 2.1.1 After adjusting the pH of the A50 washing solution to 6.8, it was divided into 6 groups, and PEG4000 was added to the concentration of 10%, 12%, 14%, 16%, 18%, 20% (w / v), and stirred at room temperature for 30%. After 15 minutes, centrifuge at 15000g and 15°C for 20 minutes, take the supernatant for specific protein analysis, the results are shown in Table 2; another A50 washing solution is divided into 6 groups, and the pH is adjusted to 6.8, 6.6, 6.4, 6.2, 6.0, 5.5 , adding PEG4000 to a concentration of 14% (w / v), stirring at room temperature for 30 minutes, centrifuging at 15000g and 15°C for 20 minutes, and taking the supernatant for specific protein analysis. The results are shown in Table 3.

[0084] Table 2 The effect of PEG4000 concentration of 10%-20% on the content of C1-INH and CER after centrifugation at pH 6.8

[0085] ...

Embodiment 3

[0095] Example 3capto MMC ion exchange chromatography

[0096] According to the composition analysis of the sample solution, the main impurity protein was ceruloplasmin. According to the investigation of the salt concentration gradient of the washing and elution buffers, the washing buffer includes 5.88g / L sodium citrate, 3.5g / L sodium chloride; the elution buffer 5.88g / L sodium citrate, 17.52 g / L sodium chloride, under these conditions, other impurity proteins can be removed, the antigen yield of C1 esterase inhibitor can reach more than 80%, and the activity yield is more than 85%.

[0097] Table 5 capto MMC ion exchange chromatography results

[0098]

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Abstract

The invention relates to a C1 esterase inhibitor and a preparation method thereof, and belongs to the field of biological pharmacy. The C1 esterase inhibitor is prepared from a washing solution which flows out of a chromatographic column in a DEAE Sephadex A50 gel adsorption process and is a waste material obtained by preparing a human prothrombin complex from plasma, and is purified by a PEG precipitation method and refined by capto MMC ion exchange chromatography, and the specific activity of a final finished product is higher than 6IU / mg.

Description

technical field [0001] The invention belongs to the field of biopharmaceuticals, in particular to a C1 esterase inhibitor and a preparation method thereof. Background technique [0002] C1 esterase inhibitor (C1-INH for short) is a serine protease inhibitor in plasma with a molecular weight of about 100-105kDa, belonging to a single-chain glycoprotein. The average concentration of C1-INH in human plasma is about 0.2 mg / mL, which is equivalent to 1 plasma unit (PU) per mL, and the concentration of C1-INH in a single human is 0.14 mg / ml to 0.38 mg / ml. [0003] C1-INH has important regulatory roles in a variety of physiological systems. In the complement system, the lack or functional defect of C1-INH causes the overactivation of complement C1, which in turn causes the uncontrolled cleavage of C4 and C2, the increase of complement kinin, and the increase of microvascular permeability, which leads to edema. In the kallikrein-kinin system, the absence or functional impairment o...

Claims

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Application Information

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IPC IPC(8): C07K14/81C07K1/36C07K1/30C07K1/18C07K1/34C07K1/16
CPCC07K14/8121
Inventor 徐佳彬李雅文陈海清何淑琴罗二华张猛
Owner 华润博雅生物制药集团股份有限公司
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