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Published on: June 25, 2017
Glucose-Responsive Peptide Coacervates with High Encapsulation Efficiency for Controlled Release of Insulin
Zhi Wei Lim1, Yuan Ping1, Ali Miserez1,2
1Centre for Biomimetic Sensor Science, School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Drive , 637553 Singapore.
Abstract:
A new glucose-responsive insulin delivery system is fabricated using biomimetic peptide coacervates derived from the Humboldt squid (Dosidicus Gigas) beak. Both insulin and glucose oxidase are coencapsulated within coacervate microdroplets. The glucose oxidase quickly responds to increasing glucose levels to generate a local acidic environment, thereby rapidly triggering the dissociation of pH-sensitive coacervates to release the insulin cargo. The rate of insulin release is dependent on the glucose level, increases under hyperglycemic conditions, and decreases under normoglycemic conditions. This glucose responsiveness mimics pancreatic β-cell function by releasing insulin according to glucose levels.
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