3 years ago

Plant-Based Hollow Microcapsules for Oral Delivery Applications: Toward Optimized Loading and Controlled Release

Plant-Based Hollow Microcapsules for Oral Delivery Applications: Toward Optimized Loading and Controlled Release
Sa-Ik Bang, Jae H. Park, Sigalit Meker, Daeho Cho, Soohyun Park, Michael G. Potroz, Haram Jung, Nam-Joon Cho, Jurriaan J. Gillissen, Raghavendra C. Mundargi, Ee-Lin Tan
Efficient oral administration of protein-based therapeutics faces significant challenges due to degradation from the highly acidic conditions present in the stomach and proteases present in the digestive tract. Herein, investigations into spike-covered sunflower sporopollenin exine capsules (SECs) for oral protein delivery using bovine serum albumin (BSA) as a model drug are reported and provide significant insights into the optimization of SEC extraction, SEC loading, and controlled release. The phosphoric-acid-based SEC extraction process is optimized. Compound loading is shown to be driven by the evacuation of air bubbles from SEC cavities through the porous SEC shell wall, and vacuum loading is shown to be the optimal loading method. Three initial BSA-loading proportions are evaluated, leading to a practical loading efficiency of 22.3 ± 1.5 wt% and the determination that the theoretical maximum loading is 46.4 ± 2.5 wt%. Finally, an oral delivery formulation for targeted intestinal delivery is developed by tableting BSA-loaded SECs and enteric coating. BSA release is inhibited for 2 h in simulated gastric conditions followed by 100% release within 8 h in simulated intestinal conditions. Collectively, these results indicate that sunflower SECs provide a versatile platform for the oral delivery of therapeutics. Porous microcapsules extracted from sunflower pollen are used to develop an effective oral drug delivery system for targeted delivery of proteins to the intestinal tract. Sporopollenin exine capsule (SEC) extraction and loading are analyzed to provide insights into these processes and allow optimization. Tableting and enteric coating of SECs are shown to inhibit protein release in simulated gastric conditions and allow for full release in simulated intestinal conditions.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201700270

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