The objective of this research is to prepare the shell of a curcumin-(CU-) loaded microcapsule by gamma radiationinduced crosslinking between chitosan (CS) and polyethylene glycol diacrylate (PEGDA) for CU delivery. The CS-PEGDA beads were irradiated by a gamma ray at 25 kGy. With confirmation by Fourier transform infrared spectroscopy, the CS-PEGDA microcapsules were successfully synthesized. The yield of irradiation-induced synthesis of CS-PEGDA was 43.94%. The particle size of the beads

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... ved under electron microscopy varied between 60 and 150 µm (x¯90 ± 18.50 µm), with 25.70% of the pores on the surface and a swelling degree of 110.48%. CU was encapsulated within the CS-PEGDA beads affording a yield of 92.6%. The CS-PEGDA beads were more durable to the razor cutting force than the CS beads and maintained their spherical morphology. A CU release study from the loaded CS-PEGDA beads under simulated gastrointestinal conditions revealed gradual, sustained release with a constant rate of 10%-20% over 6 hours. Our results suggest that the CS-PEGDA crosslinking process enabled by gamma irradiation could potentially be applied to the encapsulation of CU for effective drug delivery by oral administration.