Design of electrohydrodynamic sprayed polyethylene glycol hydrogel microspheres for cell encapsulation

Biofabrication
Anisa S QayyumSilviya P Zustiak

Abstract

Electrohydrodynamic spraying (EHS) has recently gained popularity for microencapsulation of cells for applications in cell delivery and tissue engineering. Some of the polymers compatible with EHS are alginate, chitosan, and other similar natural polymers, which are subject to ionotropic or physical gelation. It is desirable to further extend the use of the EHS technique beyond such polymers for wider biofabrication applications. Here, building upon our previous work of making PEG microspheres via EHS, we utilized the principles of EHS to fabricate cell-laden polyethylene glycol (PEG) hydrogel microspheres. The gelation of PEG hydrogel microspheres was achieved by forming covalent crosslinks between multiarm PEG acrylate and dithiol crosslinkers via Michael-type addition. We conducted a detailed investigation of the critical parameters of EHS, such as the applied voltage, inner needle diameter (i.d. needle), and flow rate, to obtain PEG microspheres with high cell viability and tightly-controlled diameters in the range of 70-300 μm. The polydispersity of cell-laden PEG hydrogel microspheres as measured by % coefficient of variation was between 6% and 23% for all conditions tested. We established that our method was compatible w...Continue Reading

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Citations

Aug 1, 2020·Advanced Healthcare Materials·Se-Jeong KimHeungsoo Shin
Apr 18, 2018·Advanced Healthcare Materials·Shangjing XinDaniel L Alge
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Dec 12, 2021·Communications Biology·Mark T KozlowskiHsun Teresa Ku

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