Alpha-TEA Salt Forms for Pharmaceutical Stability
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Solution Overview
Problem
α-Tocopheryloxyacetic acid (α-TEA) has difficulty being formulated into a commercially successful drug due to its liquid crystal-like nature, making it challenging to develop effective pharmaceutical forms that maintain activity and stability.
Innovation Solution
Synthesis of α-TEA salts using various bases, such as lysine, arginine, and tris, which form crystalline salts with improved physical properties and stability, including the development of polymorphic forms with specific X-ray powder diffraction patterns and differential scanning calorimetry profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If α-TEA is formulated as a free acid, then it maintains biological activity, but it exhibits liquid crystal-like nature causing formulation difficulties
Solution Approach 1:
The patent changes the chemical form of α-TEA from free acid to salt forms (sodium, potassium, calcium, magnesium salts), fundamentally altering its physical properties. This parameter change eliminates the liquid crystal-like behavior while maintaining the carboxylate group necessary for biological activity, thereby resolving the contradiction between formulation ease and biological activity
Solution Approach 2:
The patent creates composite salt forms by combining α-TEA with various cations (Na+, K+, Ca2+, Mg2+). These composite materials exhibit improved physical properties including reduced waxy characteristics and better solubility, while the retained carboxylate group preserves the biological activity required for tumor suppression
2Stability of the object's composition
If α-TEA is formulated into solid forms, then it improves stability, but it develops waxy characteristics that complicate formulation
Solution Approach 1:
The patent transforms α-TEA from free acid to salt forms, changing the physical state from liquid crystal-like to crystalline solids. This parameter change provides thermal stability and compositional stability while eliminating the problematic waxy characteristics through the formation of distinct crystal lattices in the salt forms
3Stability of the object's composition
If novel salt forms are synthesized, then it improves physical properties and stability, but it increases synthesis complexity
Solution Approach 1:
The patent employs straightforward neutralization reactions between α-TEA and common bases (NaOH, KOH, Ca(OH)2, Mg(OH)2) to generate various salt forms. These simple parameter changes in the synthesis process produce salts with improved physical properties and stability without requiring complex multi-step synthesis procedures
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 α-TEA salts exhibit enhanced stability, reduced waxy characteristics, and maintained biological activity, allowing for more effective formulation and administration, particularly in treating hyperproliferative diseases like cancer, with the lysine salt showing significant tumor suppression and prolonged survival in animal models.
Implementation Method 1
α-tocopheryloxyacetic acid salts have the formula: wherein X1+ is: Na+, K+, or a hydrate thereof
Implementation Method 2
having an X-ray powder diffraction pattern (CuKα) comprising two peaks at about 11.84°2θ and 19.74°2θ
Implementation Method 3
having an X-ray powder diffraction pattern (CuKα) comprising two peaks at about 11.84°2θ and 19.74°2θ
Implementation Method 4
having a differential scanning calorimetry (DSC) isotherm comprising two endotherms from about 125° C. to about 140° C. and from about 170° C. to about 195° C.
Implementation Method 5
having a thermogravimetric analysis (TGA) indicating a total volatile content of about 0.3 wt % over the temperature range of about 25-194° C.
Data Source
AI summary
The present disclosure relates to salts of the compound:polymorphic forms thereof, methods for preparation and use thereof, and pharmaceutical compositions thereof.