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Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...

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Related Experiment Video

Updated: Jun 23, 2026

Preparation of Hydroxy-PAAm Hydrogels for Decoupling the Effects of Mechanotransduction Cues
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Enzymatically Triggered Jack-in-the-Box-like Hydrogels.

Maria Balk1,2, Marc Behl1,2, Ulrich Nöchel1

  • 1Institute of Active Polymers, Helmholtz-Zentrum Geesthacht, Kantstr. 55, 14513 Teltow, Germany.

ACS Applied Materials & Interfaces
|February 8, 2021
PubMed
Summary
This summary is machine-generated.

Enzymes trigger shape changes in microstructured hydrogels via a "Jack-in-the-box" mechanism. This enzyme-specific material response releases internal stresses, enabling controlled movement for advanced applications.

Keywords:
enzymehydrogelsmicroporouspoly(ε-caprolactone)shape changestimuli-sensitive materialsswitch

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Area of Science:

  • Biomaterials Science
  • Enzyme Engineering
  • Materials Science

Background:

  • Enzymes are crucial for synthesizing and degrading biomacromolecules.
  • Controlled material deformation is essential for advanced technological applications.

Purpose of the Study:

  • To demonstrate enzyme-induced macroscopic movement in microstructured hydrogels.
  • To introduce the "Jack-in-the-box" effect for controlled material actuation.

Main Methods:

  • Designing microstructured hydrogels with kinetically frozen internal stresses via polyester locking domains.
  • Incorporating enzyme-specific cleavable bonds within the locking domains.
  • Utilizing enzymatic reactions to trigger the release of stored energy and induce shape transformation.

Main Results:

  • The
  • Jack-in-the-box
  • effect was successfully demonstrated, leading to enzyme-specific macroscopic hydrogel movement.
  • Enzymatic cleavage of locking domains released internal stresses, causing a pre-stressed shape transformation.
  • The process involves entropy increase and swelling-supported polymer chain stretching.

Conclusions:

  • Enzymes can act as physiological stimuli to control material behavior.
  • This approach enables the creation of interactive, enzyme-specific materials.
  • Potential applications include optical indicators, actuators, and sensors in biotechnology and fermentation.