Non-aqueous 5-ALA Formulation Stability
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Solution Overview
Problem
Existing formulations containing 5-aminolevulinic acid (5-ALA) face stability issues due to degradation when combined with iron compounds and moisture, leading to a reduction in ALA concentration over time.
Innovation Solution
A non-aqueous formulation comprising a compound of the formula (I) or its salt, combined with a sugar or sugar alcohol, and at least one component with a melting point of 30 to 100°C, such as fatty acids or fatty acid esters, to enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If 5-ALA is formulated with iron compounds and moisture, then the formulation can be developed with common excipients, but the stability of 5-ALA deteriorates and concentration reduces rapidly
Solution Approach 1:
The patent removes moisture from the formulation system by using non-aqueous solvents (ethanol, isopropanol, or their mixtures with water content below 5%). This extraction of the harmful moisture component prevents the degradation reaction between 5-ALA and iron compounds while maintaining formulation developability with common excipients.
Solution Approach 2:
The patent creates an inert environment by using non-aqueous solvents that do not support the degradation pathway. The low water content environment (<5% water) acts as an inert medium that prevents the hydrolysis and oxidation reactions that would otherwise occur in aqueous formulations, thereby preserving 5-ALA stability.
2Stability of the object's composition
If a non-aqueous formulation is used to maintain 5-ALA stability, then degradation is prevented, but the formulation complexity increases
Solution Approach 1:
The patent changes the fundamental parameter of solvent water content from typical aqueous levels (>90% water) to non-aqueous levels (<5% water). This single parameter change achieves 5-ALA stability while maintaining compatibility with standard pharmaceutical excipients and manufacturing processes, avoiding excessive formulation complexity.
Data Source
AI summary
The present invention provides a non-aqueous preparation that comprises 5-ALA, a derivative thereof, or a salt of these, and that has excellent stability of the 5-ALA, the derivative, or the salt of these. A non-aqueous preparation according to the present invention comprises: a compound represented by the following general formula (I) or a salt thereof; a sugar or a sugar alcohol; and at least one substance selected from the group consisting of fatty acids, fatty acid esters, aliphatic hydrocarbons, and aliphatic alcohols with a melting point of 30-100°C. [In general formula (I), R1 represents a hydrogen atom or an acyl group, and R2 represents a hydrogen atom, a linear or branched alkyl group, a cycloalkyl group, an aryl group, or an aralkyl group.]