Unlock instant, AI-driven research and patent intelligence for your innovation.

Liposome composition and method for producing same

a technology of liposome and composition, which is applied in the direction of medical preparations, pharmaceutical non-active ingredients, nanotechnology, etc., can solve the problems of difficult to ensure long-term preservation stability, and difficult to release a drug, so as to achieve easy to secure long-term preservation stability

Inactive Publication Date: 2017-02-16
FUJIFILM CORP
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a liposome composition that encapsulates a water-soluble drug in a dissolved state and has excellent preservation stability even in stringent conditions. The composition also has a high preservation stability and a long-term preservation stability, and is also capable of achieving a release rate of the drug on the order of several tens of hours. The method for producing the liposome composition is efficient and suitable for industrial production. This invention solves the problem of difficult release of drugs from liposomes due to strong interactions.

Problems solved by technology

In a method of adsorbing and retaining a drug onto a lipid membrane of a liposome, release of the drug to the outside of the liposome becomes difficult due to strong interactions such as hydrophobic interactions and electrostatic interactions.
In this case, it becomes difficult to release a drug to an affected area since interactions are too strong.
However, rendering to have hyper-osmotic conditions results in ready leakage of the drug from the liposome composition, so it is difficult to ensure long-term preservation stability.
However, microparticulation contributes to an increase in the curvedness (curvature) of a liposome membrane, thus resulting in difficulty of encapsulating a drug.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Liposome composition and method for producing same
  • Liposome composition and method for producing same
  • Liposome composition and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

example 1

a) Preparation of Oil Phase

[0141]16.6 g of hydrogenated soybean phosphatidylcholine, 2.0 g of cholesterol and 4.3 g of N-(carbonyl-methoxypolyethylene glycol 2000)-1,2-distearoyl-sn-glycero-3-phosphoethanolamine sodium salt (hereinafter, also referred to as DSPE-PEG) were taken to be a molar ratio of 76 / 19 / 5, and then 405 mL of an organic solvent (ethanol / ethyl acetate=3 / 1) was added thereto, followed by warming to 70° C. and dissolving the lipids to prepare an oil phase.

b) Preparation of Water Phase

[0142]6 mM phosphate buffer (pH 7.86) was prepared to serve as a water phase.

c) Preparation of Drug-Unencapsulated Liposome

[0143]The water phase was warmed to 70° C., the oil phase was added in such a way that a volume ratio of water phase / oil phase=8 / 3 is achieved, and then two phases were mixed using a rotary agitation type emulsification machine at circumferential speed of 20 m / s and 13000 rpm for 30 minutes. Thereafter, the organic solvent and water were evaporated by blowing with ni...

example 2

[0161]A liposome composition was prepared in the same manner as in Example 1, except that, in the preparation of an oil phase, 49.9 g of hydrogenated soybean phosphatidylcholine, 6.1 g of cholesterol and 12.9 g of DSPE-PEG were used, and a water phase / oil phase mixed liquid was mixed using a rotary agitation type emulsification machine at a circumferential speed of 19 m / s and 12000 rpm for 30 minutes, and in the drug loading step, 10×PBS (manufactured by NIPPON GENE CO., LTD.) was used in place of PBS prepared in d) of Example 1, and 10×PBS (manufactured by NIPPON GENE CO., LTD.) was used in place of 2.7-fold diluted (by weight) PBS prepared in d) of Example 1, whereby a drug-encapsulated liposome composition having a gemcitabine concentration of 0.72 mg / mL, a particle size of 84 nm, a drug unencapsulation rate of 2.1%, an inner water phase osmotic pressure of 1039 mOsm / kg, and an outer water phase osmotic pressure of 285 mOsm / kg, with the osmotic pressure of the inner water phase b...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Provided are a liposome composition in which an osmotic pressure of an inner water phase is 2-fold to 8-fold relative to the osmotic pressure of an outer water phase, and which encapsulates a water-soluble drug in a dissolved state, and also exhibits excellent preservation stability; and a method for producing the same. According to the present invention, it is possible to provide a liposome composition, including liposomes obtained from lipids dissolved and emulsified in an organic solvent, each of which has an inner water phase and an aqueous solution which constitutes an outer water phase and in which the liposomes are dispersed, in which each of the liposomes encapsulates a water-soluble drug in a dissolved state, and an osmotic pressure of the inner water phase is 2-fold to 8-fold relative to the osmotic pressure of the outer water phase; and a method for producing the same.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of PCT / JP2015 / 062984 filed on Apr. 30, 2015 and claims priority under 35 U.S.C. §119 of Japanese Patent Application No. 94141 / 2014 filed on Apr. 30, 2014,BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a liposome composition and a method for producing the same. The present invention relates to a liposome composition which can be preferably used for pharmaceutical applications and a method for producing the same.[0004]2. Description of the Related Art[0005]A liposome (hereinafter, also referred to as lipid vesicle) is a closed vesicle formed of a lipid bilayer membrane using lipids, and has a water phase (inner water phase) within the space of the closed vesicle. Liposomes are usually present in a state of being dispersed in an aqueous solution (outer water phase) outside the closed vesicle.[0006]Liposomes have been studied for a variety of applicati...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): A61K9/127A61K31/7068
CPCA61K9/127A61K31/7068A61K9/1278A61K9/1271A61K47/28B82Y5/00A61K47/24
Inventor ONO, MAKOTOONO, KOHEIMATSUMOTO, TAKESHIMORI, MIKINAGA
Owner FUJIFILM CORP