Initial design and physical characterization of a polymeric device for osmosis-driven delayed burst delivery of vaccines

Melchels, Ferry P.W., Fehr, Ingo, Reitz, Annika S, Dunker, Urip, Beagley, Kenneth W, Dargaville, Tim R., & Hutmacher, Dietmar W (2015) Initial design and physical characterization of a polymeric device for osmosis-driven delayed burst delivery of vaccines. Biotechnology and Bioengineering, 112(9), pp. 1927-1935.

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Achieving the combination of delayed and immediate release of a vaccine from a delivery device without applying external triggers remains elusive in implementing single administration vaccination strategies. Here a means of vaccine delivery is presented, which exploits osmosis to trigger delayed burst release of an active compound. Poly(-caprolactone) capsules of 2 mm diameter were prepared by dip-coating, and their burst pressure and release characteristics were evaluated. Burst pressures (in bar) increased with wall thickness (t in mm) following Pburst = 131.t + 3.4 (R2 = 0.93). Upon immersion in PBS, glucose solution-filled capsules burst after 8.7 ± 2.9 days. Copolymers of hydrophobic  -caprolactone and hydrophilic polyethylene glycol were synthesized and their physico-chemical properties were assessed. With increasing hydrophilic content, the copolymer capsules showed increased water uptake rates and maximum weight increase, while the burst release was earlier: 5.6 ± 2.0 days and 1.9 ± 0.2 days for 5 and 10 wt% polyethylene glycol, respectively. The presented approach enables the reproducible preparation of capsules with high versatility in materials and properties, while these vaccine delivery vehicles can be prepared separately from, and independently of the active compound.

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ID Code: 83856
Item Type: Journal Article
Refereed: Yes
Keywords: vaccine delivery, biodegradable polymers, osmosis, burst release
DOI: 10.1002/bit.25593
ISSN: 1097-0290
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 04 May 2015 03:33
Last Modified: 01 Jul 2016 14:00

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