HPMCAS-Stabilized Amorphous Solid Dispersion Composites

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Solution Overview

Problem

Existing solid dispersions with drugs in an amorphous state face issues of physical stability due to recrystallization during storage, and the stabilizing effect of using hydroxypropyl methyl cellulose acetate succinate (HPMCAS) as an external stabilizer is not well understood for carriers other than polyvinylpyrrolidone (PVP).

Innovation Solution

A composite is formed by combining a solid dispersion containing carriers like vinylpyrrolidone-vinyl acetate copolymer, methyl cellulose, hydroxypropyl methyl cellulose, and hydroxypropyl methyl cellulose phthalate with hydroxypropyl methyl cellulose acetate succinate outside the dispersion, enhancing drug dissolution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If a solid dispersion with a drug in an amorphous state is used, then the solubility and bioavailability of the drug are improved, but the physical stability deteriorates due to recrystallization during storage

Engineering Contradiction:

ImprovesolubilityVSAvoidphysical stability

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

HPMCAS acts as an intermediary stabilizer between the amorphous drug and the crystalline environment, preventing drug molecules from reorganizing into crystalline structures while maintaining the amorphous state and enhancing solubility

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention creates a composite system combining the amorphous solid dispersion with HPMCAS as an external stabilizer component, where the synergistic interaction between the carrier material and HPMCAS provides both solubility enhancement and physical stability

Inventive Principle:

Principle #40Composite materials

2Productivity

If polyvinylpyrrolidone (PVP) is used as the carrier in the solid dispersion, then the dissolution of the drug is improved, but the applicability to other carrier types remains unknown

Engineering Contradiction:

ImprovedissolutionVSAvoidcarrier type compatibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

HPMCAS serves as a universal stabilizer that can be combined with multiple different carrier materials (PVP, methyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl methyl cellulose phthalate, and HPMCAS itself), making the stabilization approach applicable across various solid dispersion systems regardless of the specific carrier used

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If methyl cellulose is used as the carrier, then the combination with HPMCAS greatly improves drug dissolution, but methyl cellulose has hardly been used to date as a carrier

Engineering Contradiction:

ImprovedissolutionVSAvoidcarrier availability

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The invention changes the parameter of carrier selection by introducing methyl cellulose, a material that was rarely used as a solid dispersion carrier, and combines it with HPMCAS to achieve superior dissolution properties, thereby expanding the range of effective carrier materials

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This combination significantly improves drug dissolution, providing high initial dissolution and stability, particularly for poorly water-soluble drugs.

Implementation Method 1

The solid dispersion, where a drug in an amorphous state is molecularly dispersed in the carrier, apparently and remarkably increases the solubility of the drug to improve bioavailability

Methodology Applied

Scientific EffectMolecular dispersion: Dispersion (of waves)

Implementation Method 2

there is a problem of physical stability, causing recrystallization of the drug during storage of the solid dispersion

Methodology Applied

Scientific EffectAmorphous state stabilization: Metastability

Implementation Method 3

a pharmaceutical composition containing a solid dispersion and a stabilizer outside the solid dispersion has been proposed

Methodology Applied

Scientific EffectStabilization by polymer: Adsorption

Data Source

PatentEP4635482A1Composite comprising amorphous solid dispersion

Publication Date: 2025.10.22 SHIN ETSU CHEMICAL CO LTD

Figure 1

AI summary

There is provided a composite having a higher dissolution of a drug, the composite including at least a solid dispersion containing the drug and a carrier other than polyvinylpyrrolidone as well as HPMCAS outside the solid dispersion. More specifically, there is provided a composite including at least a solid dispersion containing at least a drug and a carrier selected from the group consisting of a vinylpyrrolidone-vinyl acetate copolymer, methyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl methyl cellulose phthalate and first hydroxypropyl methyl cellulose acetate succinate; and second hydroxypropyl methyl cellulose acetate succinate outside the solid dispersion.