Photodynamic effects of chlorin e6 attached to single wall carbon nanotubes through noncovalent interactions |
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Authors: | Hairong Xiao Bangshang Zhu Dali Wang Yan Pang Lin He Xiaofei Ma Ruibin Wang Chengyu Jin Yan Chen Xinyuan Zhu |
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Affiliation: | 1. Instrumental Analysis Center, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People’s Republic of China;2. School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People’s Republic of China |
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Abstract: | Chlorin e6 (Ce6), a big heterocyclic aromatic molecule, is considered promising photosensitizer for photodynamic therapy (PDT). Here an efficient nano-photosensitizer delivery system based on noncovalent interactions between Ce6 and single wall carbon nanotubes (SWCNTs) is proposed. By utilization of high surface area of SWCNTs, Ce6 was loaded on them with a high drug loading content by noncovalent π–π interactions. Then, the Ce6–SWCNT complexes were wrapped by chitosan to improve aqueous solubility and biocompatibility. The chemical characteristics of Ce6–SWCNTs and chitosan–Ce6–SWCNTs were evaluated by different analysis methods, including transmission electron microscopy, UV–Visible absorption spectra, and Fourier transform infrared spectra. The high cellular uptake of chitosan–Ce6–SWCNTs was confirmed by flow cytometry and confocal laser scanning microscopy. According to the WST-1 assay, the chitosan–Ce6–SWCNTs exhibited low dark toxicity and efficient PDT efficacy to HeLa cancer cells. These results indicate that chitosan–Ce6–SWCNTs are a potential photosensitizer delivery system for PDT. |
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