Thiolated Antioxidants in Lipid Formulations for Oxidative Stability
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Solution Overview
Problem
Existing lipid-based controlled-release formulations are susceptible to oxidative degradation, which limits their stability and effectiveness, and many antioxidants used to mitigate this are not compatible with lipid systems, leading to potential increased degradation of active agents.
Innovation Solution
Incorporating thiolated antioxidants, such as mono-thioglycerol (MTG) and cysteine analogues, into lipid matrices to reduce oxidative degradation, combined with chelating agents like EDTA, to stabilize both the active agents and lipid components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antioxidants are used in lipid formulations, then oxidative degradation is reduced, but compatibility with lipid systems is poor and active agent degradation may increase
Solution Approach 1:
The patent changes the chemical structure parameter of antioxidants by introducing thiol groups (S-H) to conventional antioxidant molecules. This structural modification enables the antioxidant to become lipid-soluble and compatible with lipid formulations while maintaining or enhancing its ability to prevent oxidative degradation of both the lipid matrix and active agents.
Solution Approach 2:
The patent creates a composite antioxidant system combining thiolated antioxidant molecules with specific lipid formulation components. This composite approach ensures compatibility between the antioxidant and lipid system while providing synergistic protection against oxidation, resolving the contradiction between effectiveness and compatibility.
2Loss of time
If lipid formulations are stored for extended periods, then convenience of administration is improved, but oxidative degradation increases reducing effectiveness
Solution Approach 1:
The thiolated antioxidant is incorporated into the lipid formulation during manufacturing, performing preliminary protection against oxidative degradation before storage begins. This pre-established protective mechanism allows the formulation to maintain stability throughout extended storage periods, enabling longer shelf life without sacrificing reliability.
3Reliability
If thiolated antioxidants are used to prevent oxidation, then formulation stability is improved, but manufacturing complexity may increase
Solution Approach 1:
The thiolation modification is performed on conventional antioxidant molecules using established chemical synthesis methods. The resulting thiolated antioxidants maintain similar physical properties to their parent compounds, allowing them to be incorporated into lipid formulations using conventional manufacturing processes without requiring entirely new manufacturing approaches.
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 use of thiolated antioxidants significantly enhances the stability and effectiveness of lipid formulations by suppressing oxidative degradation, allowing for longer storage and extended duration of action, while maintaining biocompatibility and compatibility with lipid systems.
Implementation Method 1
oxidative degradation is a significant factor with regard to stability
Implementation Method 2
combined with chelating agents like EDTA, to stabilize both the active agents and lipid components
Data Source
AI summary
The present invention provides a formulation comprising:i) a lipid matrix;ii) at least one thiolated antioxidant;iii) optionally at least one bioactive agent; andiv) optionally at least one chelating agent.