Polymeric nanostructures with pH-labile core for controlled drug release.

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Stimuli-triggered controlled drug delivery is crucial for advanced therapeutics.
• Developing versatile and efficient nanocarriers remains a significant challenge.

Purpose of the Study:

• To synthesize core cross-linked polymeric nanostructures (CLPN) using a Michael addition reaction.
• To evaluate the drug encapsulation and release capabilities of the CLPN.
• To investigate the pH- and temperature-responsive release behavior of the nanocarriers.

Main Methods:

• Synthesis of acrylate-functionalized triblock copolymer (poly(ethylene glycol)-b-poly(N-isopropylacrylamide)-b-poly(acrylic acid)).
• Formation of CLPN via Michael addition between acrylate groups and thiol-functionalized cross-linker.
• Drug encapsulation studies and in vitro release assays under varying pH and temperature conditions.

Main Results:

• Successfully synthesized CLPN with controllable size and structure.
• Demonstrated efficient encapsulation of model drug molecules within the nanoparticle core.
• Observed pH-triggered degradation of the core leading to drug release.
• Confirmed temperature-sensitive drug release behavior.
• Established the non-toxic nature of both precursor polymers and CLPN.

Conclusions:

• The developed CLPN offer a versatile platform for stimuli-responsive drug delivery.
• The pH- and temperature-triggered release mechanisms highlight their potential for targeted and controlled therapeutic applications.
• The non-toxic profile supports their suitability as drug carriers in advanced therapy.