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Release profile of β-casein-encapsulated PLGA microparticles in DMEM in a shaking incubator under air. Results are shown as mean ± SD (n = 3). The release test conducted in DMEM shows an initial, linear release in 7 days and then a slowed and sustained release of the protein over 20 days. Note that ~67% of the encapsulated protein was released at the 20 day time point, indicating that the controlled release was extended to a significantly longer period of time.
