Construction of a 980 nm laser-activated Pt(II) metallacycle nanosystem for efficient and safe photo-induced bacteria sterilization

초록

Although metal-based chemical agents have demonstrated promising bacteriostatic effects in phototherapy, their short excitation/emission wavelengths and inadequate phototherapy efficiencies make their application in vivo difficult. We therefore synthesized a novel Pt(II) metallacycle (Pt1110) that can be activated with a 980 nm laser for photodiagnosis/treatment in deep tissue. We found that Pt1110 significantly improved photothermal conversion (95% improvement) and O-1(2) generation (phi(& UDelta;) 75% increase) compared to the ligand itself 1 and was well capable of light-induced sterilization under safe laser irradiation (0.72 W/cm(2)). In addition, Pt1110 has little to no toxicity to cells. After incorporated into liposome, Pt1110 NPs was effective in wound healing in infection and keratitis models upon laser irradiation, which was accurately observed by NIR-II fluorescence imaging. This novel metal-coordinated supramolecular material has a potential to become a universal platform for phototherapy in deep tissue.

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