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Area of Science:

  • Materials Science
  • Biotechnology
  • Chemical Engineering

Background:

  • Enzyme immobilization is crucial for industrial applications but often faces challenges in maintaining enzyme activity.
  • Existing strategies for enzyme encapsulation struggle to provide optimal microenvironments for enzyme function.

Purpose of the Study:

  • To develop a novel sacrificial templating method for creating hollow covalent organic framework (COF) capsules for enzyme encapsulation.
  • To enhance enzyme activity and stability through improved conformational freedom and mass transfer within the COF capsules.

Main Methods:

  • Utilized metal-organic frameworks (MOFs) as sacrificial templates to synthesize hollow COF capsules.
  • Encapsulated various enzymes within the COF capsules to assess the strategy's versatility.
  • Investigated the tunability of COF capsule dimensions, pore sizes, and shell thickness.

Main Results:

  • The sacrificial templating method successfully produced hollow COF capsules capable of encapsulating enzymes.
  • Enzymatic activity was significantly boosted due to a capacious microenvironment, improved conformational freedom, enhanced mass transfer, and protection from the external environment.
  • The strategy demonstrated high versatility, applicable to diverse biomacromolecules, MOF templates, and COF capsules.
  • Tunable properties of COF capsules allowed for customization of bioreactors, including successful coencapsulation of enzymes with synergistic functions.

Conclusions:

  • This study presents a new avenue for overcoming limitations in enzymatic immobilization within porous materials.
  • The developed COF capsules offer a promising platform for creating advanced bioreactors, biomicrodevices, and artificial organelles.