American Chemical Society
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γ‑PARCEL: Control of Molecular Release Using γ‑Rays

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journal contribution
posted on 2015-12-01, 00:00 authored by Shuhei Murayama, Jun-ichiro Jo, Kazutaka Arai, Fumihiko Nishikido, Rumiana Bakalova, Taiga Yamaya, Tsuneo Saga, Masaru Kato, Ichio Aoki
We previously have developed the photoresponsive tetra-gel and nanoparticles for controlling the function of the encapsulated substance by UV irradiation. However, the penetration ability of the UV is not high enough. Here, we developed a radiation-responsive tetra-gel and nanoparticle based on γ-ray-responsive X-shaped polyethylene glycol (PEG) linker with a disulfide bond. The nanoparticle could retain small molecules and biomacromolecules. γ-Rays were used as a trigger signal because of their higher penetrating ability. This allowed a spatiotemporal release and control of the encapsulated substances from the nanoparticle in the deeper region, which is impossible by using light exposure (ultraviolet, visible, and near-infrared).