Sustained-release microsphere of LHRH antagonist for injection and preparation process thereof

A technology of sustained-release microspheres and antagonists, which can be applied to medical preparations with non-active ingredients, medical preparations containing active ingredients, and drug combinations, etc., and can solve the problems of patient pain, low bioavailability, and short biological half-life.

Inactive Publication Date: 2007-05-23
INST OF PHARMACOLOGY & TOXICOLOGY ACAD OF MILITARY MEDICAL SCI P L A
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Because the biological half-life of LHRH antagonists and their analogs is very short, the bioavailability of existing preparations in the blood is very low and the toxic and si...

Method used

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  • Sustained-release microsphere of LHRH antagonist for injection and preparation process thereof
  • Sustained-release microsphere of LHRH antagonist for injection and preparation process thereof
  • Sustained-release microsphere of LHRH antagonist for injection and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: Preparation of LXT-101 Microspheres by Double Emulsion Method

[0051] Dissolve 50mg of LXT-101 in 0.5ml of gelatin aqueous solution, 500mg of polylactide-glycolide (PLGA, lactide:glycolide=50:50, molecular weight 11000) in 5ml of dichloromethane, dichloromethane Those combined, at room temperature high-speed homogenizer per minute 10000 rpm high-speed stirring for 3 minutes to form a W / O emulsion; W / O emulsion is poured into 500ml containing 0.2% polyvinyl alcohol and 10% sodium chloride in the external water phase, Form W / O / W double emulsion, stir at a low speed of 500 rpm for 4 hours, volatilize the organic solvent, centrifuge, wash 3 times with distilled water, and freeze-dry for 20 hours to obtain a white powder with good fluidity. 76%, the particle size of the microspheres ranges from 5 to 80 μm, and the average particle size is 39.5 μm. The appearance is round and the particle size distribution is shown in Figure 1.

Embodiment 2

[0052] Example 2: Preparation of LHRH antagonist-LXT-101 microspheres by single milk method

[0053] Dissolve 10 mg of the main drug LXT-101 and 90 mg of PLGA (lactide:glycolide=75:25, molecular weight 36000) in a mixed solvent of dichloromethane and glacial acetic acid (7:3) (oil phase), Wherein the concentration of PLGA in the organic solvent is 300mg / ml, the above-mentioned oily phase (comprising principal agent and biodegradable polymer) is added to 2%PVA (polyethylene glycol) under the condition of stirring at a high speed of 7000 revolutions per minute for 5 minutes at room temperature. Vinyl alcohol) to form a W / O emulsion, and volatilize the organic solvent for 4 hours under low-speed stirring at 500 rpm. After the microspheres are solidified, centrifuge, wash, and freeze-dry to obtain the microspheres. The encapsulation rate of the microspheres prepared by this method can reach 78%, the measured particle size is 5-120 μm, and the average particle size is 48.9 μm. The ...

Embodiment 3

[0054] Example 3: Preparation of LHRH antagonist-LXT-101 microspheres by S / O / O method

[0055] 75mg PLGA (lactide:glycolide=75:25, molecular weight is 20000) and 15mgPEG (molecular weight is 8000) (weight ratio 9:1) are dissolved in acetonitrile together, and concentration is C=500mg / ml, and micropowder The thawed LXT-101 powder (<20 μm) was suspended in the acetonitrile solution of the polymer, and dispersed uniformly under the condition of ice bath and 15000 rpm. The above solution was added dropwise to the continuous phase - cottonseed oil (containing 1.6% span 85) under the condition of mechanical stirring at 750rpm. After stirring for 5 h, petroleum ether (bp 50-110° C.) was added to cottonseed oil to extract residual acetonitrile. Stir for another 15 min, collect the microspheres by filtration, wash the microspheres with 250 ml petroleum ether and freeze-dry them for later use. The encapsulation rate of the microspheres obtained by this method can reach 65%, the measur...

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Abstract

The invention relates to an injection slow-release micro ball of LHRH antagonist material, wherein its average diameter is 0.5-100 mum, with high package ratio. And it comprises LHRH antagonist material, degradable macromolecule findings, and other acceptable findings. The invention uses emulsion-liquid drying method, single-emulsion-liquid drying method, S/O/O method, atomization drying method, etc. Said micro ball can prolong drug function time, improve utilization of LHRH antagonist material, and reduce side effect.

Description

technical field [0001] The present invention relates to injection slow-release microspheres of LHRH antagonists and their analogs or salts (hereinafter collectively referred to as LHRH antagonist substances) and a preparation method thereof. Background technique [0002] Luteinizing hormone-releasing hormone (LHRH) is a decapeptide hormone secreted by the hypothalamus. Its main function is to promote the synthesis and release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) by the pituitary gland, stimulate pubertal development and regulate fertility and sex hormone-related processes. In order to develop related drugs, people are committed to chemically modifying and transforming the molecular structure of LHRH, and have synthesized more than 3,000 LHRH analogs, which are one of the most studied peptides so far. Divided by function, these analogs can be divided into two categories: one is agonistic analogs, and the other is antagonistic analogs. [0003] ...

Claims

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Application Information

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IPC IPC(8): A61K9/16A61K47/34A61K38/09A61P5/00A61P35/00A61K47/10
Inventor 梅兴国杜丽娜程军平周文霞刘克良郄建坤张振清
Owner INST OF PHARMACOLOGY & TOXICOLOGY ACAD OF MILITARY MEDICAL SCI P L A
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