High-Loading Core-Shell Retinoid Capsules for Sustained Release
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Solution Overview
Problem
Existing retinoid formulations suffer from low solubility and stability, leading to reduced efficacy and increased side effects due to low retinoid content and rapid degradation, necessitating improved encapsulation methods.
Innovation Solution
A high-content/sustained-release retinoid capsule with a core-shell structure comprising a liquid lipid core containing retinoid and an amine compound, surrounded by a solid lipid shell, enhancing solubility and stability, and controlled release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If retinoid is encapsulated using conventional methods with solid lipids or simple polymers, then the capsule structure is simple and easy to manufacture, but the retinoid content is very low (0.01% by weight) due to poor solubility
Solution Approach 1:
The patent employs a composite capsule structure combining solid lipid shell material with liquid lipid core containing retinoid and amine compound. This composite approach enables high retinoid loading (20% by weight) by utilizing the solubility of retinoid in liquid lipid, while the solid lipid shell provides structural integrity. The composite material strategy resolves the contradiction between high retinoid content and structural simplicity.
Solution Approach 2:
The patent implements a core-shell nested structure where the liquid lipid core containing retinoid is surrounded by a solid lipid shell. This nesting approach allows the retinoid-rich core to be protected and controlled by the outer shell, enabling high retinoid content (20% by weight) while maintaining a well-defined capsule structure that is feasible for manufacture.
2Reliability
If retinoid is used in high concentration to improve wrinkles effectively, then the anti-wrinkle effect is enhanced, but side effects such as pruritus, burning sensation, and erythema increase significantly
Solution Approach 1:
The patent incorporates an amine compound into the liquid lipid core alongside retinoid, which forms a complex that stabilizes the retinoid and prevents its premature degradation. This preliminary stabilization action ensures that retinoid remains intact until delivery to the skin, enabling effective anti-wrinkle action at high concentrations while minimizing degradation products that cause side effects.
Solution Approach 2:
The solid lipid shell acts as a controlled release barrier that regulates the release rate of retinoid from the core. This shell structure enables sustained release of high concentrations of retinoid, maintaining therapeutic levels for wrinkle improvement while preventing sudden high-dose exposure that would cause severe side effects like burning sensation and erythema.
3Stability of the object's composition
If retinoid is exposed to air or light, then it degrades rapidly and loses effectiveness, but encapsulation methods have not successfully prevented photodegradation
Solution Approach 1:
The patent encapsulates retinoid within a liquid lipid core that creates a protected environment, isolating the retinoid from external air and light. The amine compound in the core further stabilizes retinoid through complex formation. This inert-like environment within the capsule prevents photodegradation and oxidation, maintaining retinoid stability and effectiveness over time.
Solution Approach 2:
The amine compound serves as an intermediary that stabilizes retinoid through complex formation, protecting it from degradation by air and light. This intermediary action within the liquid lipid core enhances retinoid stability without requiring the retinoid to be exposed to harsh conditions, thereby maintaining its effectiveness over time.
4Quantity of substance
If conventional encapsulation methods are used, then the manufacturing process is simple, but the actual content of retinoid in the capsule is very low despite various patent applications
Solution Approach 1:
The patent changes the physical state of the lipid from solid to liquid in the core, and utilizes the solubility parameters of retinoid in liquid lipid. By forming a complex between retinoid and amine compound in the liquid lipid phase, the patent achieves high retinoid loading (20% by weight). The core-shell structure with solid lipid shell maintains manufacturability while the liquid core enables high content.
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
The capsule significantly increases retinoid content and stability, reducing side effects while maintaining effective wrinkle improvement by controlled release, as demonstrated by increased epidermal thickness and dermal collagen production.
Implementation Method 1
the liquid lipid core comprises retinoid and an amine compound
Implementation Method 2
a retinoid capsule particle comprising a solid lipid shell; and a liquid lipid core
Implementation Method 3
since the retinoid is easily photodegraded by exposure to air or light
Data Source
AI summary
Provided is a composition for improving wrinkles including a high-content/sustained-release retinoid capsule. The high-content/sustained-release retinoid capsule according to the presently claimed subject matter can minimize skin side effects and maximize wrinkle improvement effects by significantly increasing the retinoid content in the capsule and stability and controlling the release rate.