Hydrophobic API Nanoparticle Dispersion via Ionizable Stabilizer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing nanoparticles of hydrophobic active pharmaceutical ingredients (APIs) face challenges such as high cost, limited applicability to heat-sensitive APIs, and the formation of agglomerates, which reduces bioavailability and requires additional processing steps.
Innovation Solution
A method for preparing an aqueous dispersion of nanoparticles of hydrophobic APIs using a polymeric stabilizing agent with ionizable groups, where the API and stabilizer are dissolved in a non-aqueous solvent and then mixed with a hydrophilic solvent containing an acid or base to achieve ionization of the stabilizer, resulting in stable nanoparticles with defined size and reduced agglomeration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wet grinding is used to produce nanoparticles, then the active ingredient can be processed into nanoparticulate form, but the process is costly, limited to heat-resistant and water-resistant APIs, and produces crystalline form which reduces solubility
Solution Approach 1:
The invention changes the fundamental parameter of the stabilization mechanism from physical (steric hindrance in wet grinding) to chemical (electrostatic repulsion through ionization). The polymeric stabilizing agent is ionized by adding acid or base to achieve 10-100% ionization, creating charged groups that repel each other and stabilize nanoparticles. This chemical parameter change enables the method to work with heat-sensitive and water-soluble APIs that cannot withstand wet grinding conditions.
2Object-affected harmful factors
If precipitation method is used to produce nanoparticles, then heat-sensitive APIs can be processed without heat or friction, but nanoparticles tend to form agglomerates that require further work-up
Solution Approach 1:
The polymeric stabilizing agent acts as an intermediary between the hydrophobic API and the aqueous environment. During the mixing step, the stabilizer forms interfaces between the API, the stabilizer itself, and the surrounding solvents, preventing direct contact and aggregation. The ionizable groups on the stabilizer create electrostatic repulsion that maintains nanoparticle stability without requiring additional processing steps to break agglomerates.
3Stability of the object's composition
If polymeric stabilizing agent with ionizable groups is used, then nanoparticle stability is improved and agglomeration is reduced, but additional reagents (acid or base) are required to achieve ionization
Solution Approach 1:
The acid or base is added to the non-aqueous solvent containing the API and stabilizer before mixing with the hydrophilic solvent. This preliminary ionization step ensures that the stabilizing agent is fully ionized (10-100% ionization) before nanoparticle formation begins, maximizing the electrostatic repulsion effect. The ionization is achieved in advance during the preparation of the first composition, simplifying the overall process.
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 method produces nanoparticles with improved stability, reduced agglomeration, and enhanced bioavailability of hydrophobic APIs, allowing for lower dosages and controlled release of the active ingredient.
Implementation Method 1
a polymeric stabilizing agent having ionizable groups that are ionizable by the addition of a suitable acid or suitable base, and/or having ionic groups... wherein said third amount of a suitable acid or base achieves an ionization of 10% to 100% of N
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a method of preparing an aqueous dispersion of nanoparticles of a hydrophobic active pharmaceutical ingredient (API). The present invention also relates to a plurality of nanoparticles produced by such method. Furthermore, the present invention relates to uses of such nanoparticles.