(A)-(B)-(A) Triblock Copolymer Drug Delivery
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Solution Overview
Problem
Current methods for delivering poorly soluble drugs and active agents in aqueous environments face challenges such as limited solubility, stability issues, and toxicity concerns, with existing polymer micelles and solubilization methods offering limited loading capacity and stability.
Innovation Solution
Development of (A)-(B)-(A) triblock copolymers comprising hydrophilic and hydrophobic polymer blocks, specifically designed to solubilize and stabilize active agents, exceeding the loading capacity of previous poly(2-oxazoline) based polymers, with a focus on biocompatibility and ease of synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional solubilization methods using solvents, surfactants or chelating agents are used, then poor water solubility of active agents is improved, but toxicity of excipients and limited stability in aqueous media worsen
Solution Approach 1:
The patent uses block copolymers as intermediary substances that mediate between hydrophobic active agents and aqueous environment. The copolymers contain hydrophobic blocks that interact with the active agent and hydrophilic blocks that interact with water, thereby solubilizing the active agent without requiring toxic solvents or surfactants.
Solution Approach 2:
The patent employs composite block copolymer structures combining hydrophobic and hydrophilic polymer blocks in specific architectures (micelle-forming, dendritic, star-shaped). This composite material approach creates formulations that simultaneously achieve high solubility, stability, and biocompatibility without relying on toxic excipients.
2Stability of the object's composition
If polymer micelles are used for solubilization, then stability in aqueous media is improved, but loading capacity of active agents worsens
Solution Approach 1:
The patent segments the polymer structure into distinct hydrophobic and hydrophilic blocks with specific architectures (micelle-forming blocks, dendritic blocks, star-shaped blocks). This segmentation allows the formation of stable micellar structures with enhanced core capacity for loading hydrophobic active agents while maintaining stability in aqueous media.
Solution Approach 2:
The patent employs nested molecular architectures where dendritic blocks or star-shaped blocks contain multiple hydrophobic domains that can simultaneously accommodate multiple active agent molecules. This nested structure increases loading capacity while the outer hydrophilic blocks maintain colloidal stability in aqueous environments.
3Quantity of substance
If high concentrations of poorly water-soluble active agents are formulated, then therapeutic efficacy is improved, but stability and solubility in aqueous media worsen
Solution Approach 1:
The patent applies local quality by creating micellar structures with distinct hydrophobic cores and hydrophilic shells. The hydrophobic core locally concentrates high amounts of poorly water-soluble active agents, while the hydrophilic shell ensures overall formulation stability and solubility in aqueous media. This local differentiation allows high active agent concentration without compromising formulation stability.
4Stability of the object's composition
If complex formulation procedures are used to achieve stable formulations, then stability of active agents is improved, but ease of formulation procedure worsens
Solution Approach 1:
The patent employs block copolymers that self-assemble into stable micellar structures through spontaneous hydrophobic-hydrophilic segregation in aqueous media. This self-service mechanism eliminates the need for complex formulation procedures, high-energy processing, or specialized equipment. The copolymers automatically form stable formulations with high loading capacity under simple mixing conditions, greatly easing the formulation 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 triblock copolymers provide stable, high-loading-capacity formulations of active agents, enhancing solubility and stability in aqueous environments, while being non-toxic and suitable for pharmaceutical compositions, surpassing previous polymer systems in efficacy.
Implementation Method 1
The present invention provides block copolymers which can be effectively used for the delivery of active agents in particular in aqueous environments... (A)-(B)-(A) triblock copolymer comprising two hydrophilic polymer blocks (A)... and a polymer block (B), said polymer block (B) being more hydrophobic than the polymer block (A)
Data Source
AI summary
Provided is an (A)-(B)-(A) triblock copolymer comprising two hydrophilic polymer blocks (A) as further defined herein, and a polymer block (B), said polymer block (B) comprising at least one type of repeating unit of the following formula (I) wherein R1 is an aliphatic hydrocarbon group which is optionally substituted with one or more of —OR5, —SR5, —NR6R7, —(NR6R7R8)+, —CONR6R7, —C(O)OR9 and —C(O)R10, wherein R5 to R10 are independently selected from H, aliphatic and aromatic residues, and wherein R1 is selected such that the polymer block (B) is more hydrophobic than the polymer block (A); and compositions, such as pharmaceutical compositions, formed with the block copolymer.