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Researchers developed new hydrogen sulfide (H2S)-responsive block copolymers (BCPs) for drug delivery. These BCPs self-assemble into particles and can be triggered by H2S, offering improved drug targeting and reduced toxicity.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Block copolymers (BCPs) offer potential for targeted drug delivery by self-assembling into particles.
  • Disease-specific triggers, like hydrogen sulfide (H2S), can activate these particles.
  • Previous methods for incorporating H2S-responsive aryl azides into BCPs were limited by sensitivity to heat, light, and radicals.

Purpose of the Study:

  • To synthesize aryl-azide-containing BCPs using a robust method under ambient conditions.
  • To investigate the self-assembly of these BCPs into particles (vesicles and bicontinuous nanospheres).
  • To evaluate the H2S-triggered response and payload encapsulation capabilities of the synthesized BCP particles.

Main Methods:

  • Utilized activator regenerated by electron transfer-atom transfer radical polymerization (AR-ATRP) for BCP synthesis.
  • Employed nanoprecipitation with different solvents (tetrahydrofuran, dimethylformamide, dimethylsulfoxide) to control self-assembly.
  • Investigated H2S triggering response and payload encapsulation of the resulting BCP particles.

Main Results:

  • Successfully synthesized aryl-azide-containing BCPs under ambient conditions.
  • Achieved self-assembly into 150-200 nm vesicles or polymeric bicontinuous nanospheres (BCNs) depending on the solvent.
  • Demonstrated H2S-triggered disruption or cross-linking of particles; unsubstituted aryl azides showed high sensitivity but limited payload encapsulation.
  • Incorporating a benzylamide substituent improved hydrophobicity and hydrophilic cargo encapsulation but reduced H2S sensitivity.

Conclusions:

  • Developed a robust method for synthesizing H2S-responsive BCPs suitable for particle formation.
  • Demonstrated control over particle morphology (vesicles vs. BCNs) and H2S responsiveness through chemical modification.
  • Highlighted a trade-off between H2S sensitivity and payload encapsulation efficiency, offering a tunable platform for drug delivery applications.