Softgel API Stability via pH Control and Anhydrous Alcohol

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Solution Overview

Problem

Softgels experience API instability due to adverse reactions between the shell and fill material, leading to degradation of active pharmaceutical ingredients like phenylephrine, which affects shelf-life and effectiveness.

Innovation Solution

The use of acidic solutions and antioxidants in the fill material composition, specifically controlling the pH below the pKa of degradants and incorporating potassium iodide, to inhibit interactions between phenylephrine and degradants of povidone and polyethylene glycol, thereby stabilizing the API.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If water is included in the softgel shell, then the shell can maintain flexibility and structure, but water can migrate into the fill material causing API degradation

Engineering Contradiction:

Improvesoftgel shell structureVSAvoidAPI degradation

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent introduces anhydrous alcohol as an intermediary substance in the fill material that acts as a water scavenger. This mediator binds water molecules through hydrogen bonding, preventing water migration from the shell to the API, thus resolving the contradiction between maintaining shell structure and preventing API degradation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical environment parameters of the fill material by adding anhydrous alcohol and adjusting pH levels. This parameter change creates a water-binding environment that prevents water migration, allowing the shell to maintain its water-containing structure without causing API degradation.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If antioxidants are added to the fill material, then API stability is improved, but the composition complexity increases

Engineering Contradiction:

ImproveAPI stabilityVSAvoidfill material composition

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent uses parameter changes by adjusting pH levels and alcohol content to create an environment that inherently protects the API from oxidation. This approach achieves API stability through environmental control rather than adding multiple antioxidant additives, thus improving reliability while minimizing composition complexity.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If pH is controlled below pKa of degradants, then API stability is improved, but the manufacturing precision requirements increase

Engineering Contradiction:

ImproveAPI stabilityVSAvoidpH control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent employs self-service by using the anhydrous alcohol and other fill material components to naturally buffer and maintain the pH below the pKa of degradants. This self-regulating system reduces the need for precise external pH control during manufacturing, achieving API stability while lowering manufacturing precision requirements.

Inventive Principle:

Principle #25Self-service

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 approach significantly improves the stability and shelf-life of phenylephrine and other APIs by minimizing degradation, maintaining the acidic environment within the softgel and reducing the formation of harmful degradants.

Implementation Method 1

controlling the pH of the fill material below the pKa of one or more degradant materials can improve the API stability of the softgel

Methodology Applied

Scientific EffectpH control:

Implementation Method 2

Methodology Applied

Scientific EffectAntioxidation:

Data Source

PatentUS20220175683A1Improved API stability in softgels

Publication Date: 2022.06.09 R P SCHERER TECH INC

AI summary

Softgels having improved stability of active pharmaceutical ingredients and methods of preparing the same are provided. In some embodiments, a softgel comprises a fill material composition and a softgel shell. In some embodiments, the fill material composition of the softgel comprises one or more active pharmaceutical ingredient (API); 2 to 15 wt. % povidone; 30 to 60 wt. % polyethylene glycol; and 0.5 to 5 wt. % propylene glycol, wherein the fill material composition has a pH of 3.75 or less. In some embodiments, the softgel shell is made from a softgel shell composition comprising an acidic component.