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Self-regulated drug delivery systems (DDS) are potential alternative to the conventional method of introducing insulin to the body due to their controlled drug release mechanism. In this study, Layer-by-Layer technique was utlized to manufacture drug loaded, pH responsive thin films. Insulin was alternated with pH-sensitive, [2-(dimethyl amino) ethyl aminoacrylate] (PDMAEMA) and topped of with polymer/glucose oxidase (GOD) layers. Similarly, films using a different polymer, namely Poly(Acrylic Acid) (PAA) were also fabricated. Exposure of the films to glucose solutions resulted to the production of gluconic acid causing a polymer conformation change due to protonation, thus releasing the embedded insulin. The insulin release was monitored by subjecting the dipping glucose solutions to Bradford Assay. Films exhibited a reversal in drug release profile in the presence of glucose as compared to without glucose. PAA films were also found out to release more insulin compared to that of the PDMAEMA films.The difference in the profile of the two films were due to different polymer-GOD interactions, since both films exhibited almost identical profiles when embedded with Poly(sodium 4-styrenesulfonate) (PSS) instead of GOD

Fabrication of Glucose-Sensitive Layer-by-Layer Films for Potential Controlled Insulin Release Applications