Abstract
Optically encoded smart particles were prepared for noble drug delivery materials. Distributed Bragg reflector (DBR) porous silicon (PSi) was generated by applying a computer-generated pseudo-square wave current waveform. This DBR PSi film was lifted off from the Si substrate and thermally oxidized to convert PSi to porous silicon dioxide (PSD). DBR PSD film was derivatized with 20(S)-Camptothecin (CPT) and fractured by ultrasono-method to give smart particles. DBR PSD smart particles exhibited a sharp photonic band gap in the optical reflectivity spectrum. Optical characteristic of PSD smart particles retained DBR photonic property in aqueous buffer solution. The release of CPT and change of reflection wavelength were measured by UV-vis and reflectance spectrometer, respectively. The intensity of differential peak from reflection resonances of the smart particles was increased with a drug release. The blue shift of reflection peak resulted in the decrease of refractive index of PSD smart particles during the drug release. The concentration of released drug exhibited an linear relationship with a release time.
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