Abstract
Photosensitive nanoparticles (NPs) were fabricated by employing chitosan hydrochloride(CHC) and photosensitive 4-oxo-4-(pyren-4-ylmethoxy) butanoic acid (PYBA) throughionic self-assembly. Transmission electron microscope (TEM) images showed that theaverage diameter of the complex NPs depended on the charge molar ratio ofPYBA to CHC. The photosensitive properties of the NPs were investigated using 1H NMR, optical photography, dynamic light scattering and TEM. As a model guest, Nile red dyewas loaded in the photosensitive NPs. Under UV light or near infrared laser irradiation, thecomplex could be dissociated and shrank, so that loaded Nile red was released owing to thedecomposition of chemical bonds in the photolabile chromophore groups. The resultsshowed that 70% of the Nile red molecules were released from the NPs under a1200 mW cm − 2 irradiation of UV light for 50 s. Moreover, the releasing rate of Nile red moleculescould be adjusted by altering UV light intensity. Such a chitosan complex haspotential applications in the design of photo-controlled guest delivery systems.
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