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Related Experiment Videos

Electrospray in the dripping mode for cell microencapsulation.

Jingwei Xie1, Chi-Hwa Wang

  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117576 Singapore.

Journal of Colloid and Interface Science
|May 9, 2007
PubMed
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This study optimized electrospray techniques for uniform microbead encapsulation of living cells. Modified electrospray with a ring electrode achieved controllable, mono-dispersed microencapsulation for applications like drug delivery.

Area of Science:

  • Biotechnology
  • Materials Science
  • Cell Encapsulation Technology

Background:

  • Microbead encapsulation protects cells from immune rejection, enabling applications in drug delivery, immunotherapy, and tissue engineering.
  • Achieving uniform microencapsulation size is crucial for consistent cell viability and therapeutic efficacy.

Purpose of the Study:

  • To investigate droplet formation for developing mono-dispersed microencapsulation of living cells with controllable size.
  • To optimize electrospray parameters for uniform cell encapsulation in microbeads.

Main Methods:

  • Utilized electrospray in dripping mode, stabilized by a ring electrode, to control droplet formation.
  • Investigated the effects of applied voltage to the nozzle and ring electrode on droplet diameter and dripping frequency.

Related Experiment Videos

  • Employed Hep G2 cell line for encapsulation in calcium alginate microbeads, analyzing microbead size distribution via phase contrast microscopy.

    • Main Results:

    • Increasing nozzle voltage reduced droplet diameter and increased dripping frequency in conventional electrospray.
    • A modified electrospray setup with a ring electrode stabilized dripping mode, enabling uniform microbead formation even at high flow rates.
    • Microbead diameters ranging from 200 micrometers to 2 mm were tunable by adjusting operating parameters.

    Conclusions:

    • Electrospray parameters significantly influence microbead size and uniformity for cell encapsulation.
    • The modified electrospray with a ring electrode offers a robust method for producing mono-dispersed microbeads suitable for various biomedical applications.
    • Controllable microencapsulation is achievable, paving the way for advanced cell-based therapies and engineered tissues.