Amphiphilic Block Copolymer Particles for Drug Delivery
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Solution Overview
Problem
Current block copolymers and microparticles/nanoparticles lack effective methods for forming amphiphilic structures that can selectively solubilize and deliver biologically active agents across biological barriers, such as the blood-brain barrier, and efficiently remove undesirable substances from fluids.
Innovation Solution
Development of amphiphilic linear block copolymers synthesized from polysaccharides and degradable polymers, which form micelles in selective solvents, allowing for the creation of particles with a hydrophilic shell and hydrophobic core or vice versa, enabling targeted delivery and sequestration of agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional block copolymers are used, then structural simplicity is maintained, but ability to form amphiphilic micelles for selective solubilization is insufficient
Solution Approach 1:
The copolymer is divided into distinct hydrophilic and hydrophobic blocks that self-assemble into micelles with separate core and shell regions, enabling selective solubilization of different substances
Solution Approach 2:
The invention combines polysaccharide-based hydrophilic blocks with synthetic hydrophobic blocks to create amphiphilic copolymers that exhibit both water solubility and oil solubilization capabilities in micellar structures
2Reliability
If polysaccharide-based hydrophilic blocks are used, then biocompatibility and renewable resource utilization are improved, but synthesis complexity increases
Solution Approach 1:
Activators and coupling agents are used as intermediaries to facilitate the chemical bonding between polysaccharide hydroxyl groups and polyester carboxyl groups, enabling efficient copolymer synthesis
Solution Approach 2:
The synthesis process utilizes changes in pH, temperature, and solvent conditions to control the polymerization reaction and micelle formation, optimizing both biocompatibility and manufacturing efficiency
3Quantity of substance
If micelles with hydrophobic cores are formed, then solubilization of hydrophobic drugs is improved, but delivery across biological barriers becomes more challenging
Solution Approach 1:
The micelle structure is designed with specific local properties: hydrophobic cores for drug loading and hydrophilic shells for biological compatibility and barrier penetration, optimizing both drug capacity and delivery efficiency
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
These particles provide non-invasive, localized delivery of pharmaceutical and nutraceutical agents to the brain and efficient removal of substances like bile acids and toxins, with enhanced biocompatibility and renewable resource utilization.
Implementation Method 1
The amphiphilic block copolymers do not form a true solution in water and are able to form micelles in a selective solvent such as water
Implementation Method 2
an amphiphilic linear block copolymer including a first polymer block and a second polymer block, wherein the first polymer block includes a polysaccharide or derivative
Data Source
AI summary
The invention relates to new amphiphilic linear block copolymers of polysaccharides and polymers. The amphiphilic linear block copolymers do not form a true solution in water and are able to form micelles in selective solvents. Also disclosed are particles, each of which has a shell and a core, and a diameter of about 1 to 1,000 nanometers, and methods of delivering agents or removing substances, e.g., undesirable substances, from a subject or environment, by using these particles.