Chinese Journal of Organic Chemistry ›› 2025, Vol. 45 ›› Issue (11): 4143-4151.DOI: 10.6023/cjoc202503024 Previous Articles     Next Articles

ARTICLES

高效率阳离子型光敏剂的设计及其在低辐照剂量光动力抗菌中应用

白雪a, 谢祎黎b, 李君缘a, 莫梓华a, 万清a,c,*()   

  1. a 南昌航空大学材料科学与工程学院 南昌 330036
    b 豫章师范学院生态与环境学院 南昌 330103
    c 华南理工大学聚集诱导发光高等研究院 广州 510530
  • 收稿日期:2025-03-24 修回日期:2025-06-07 发布日期:2025-08-18
  • 基金资助:
    国家自然科学基金(52303233); 中国科协青年人才托举(2023QNRC001); 江西省自然科学基金(20224BAB214001); 江西省自然科学基金(20232BAB203026); 广东省基础与应用基础研究基金(2023A1515110186)

Design of High Efficiency Cationic Photosensitizer and Its Application in Low Irradiation Dose Photodynamic Antibacterial

Xue Baia, Yili Xieb, Junyuan Lia, Zihua Moa, Qing Wana,c,*()   

  1. a School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063
    b School of Ecology and Environment, Yuzhang Normal University, Nanchang 330103
    c Aggregation-Induced Emission (AIE) Institute, South China University of Technology, Guangzhou 510530
  • Received:2025-03-24 Revised:2025-06-07 Published:2025-08-18
  • Contact: *E-mail: wanqingwork@nchu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(52303233); Young Elite Scientists Sponsorship Program by the China Association for Science and Technology(2023QNRC001); Natural Science Foundation of Jiangxi Province(20224BAB214001); Natural Science Foundation of Jiangxi Province(20232BAB203026); Guangdong Basic and Applied Basic Research Foundation(2023A1515110186)

Fluorescent image-guided photodynamic therapy (PDT) has many advantages such as in situ visualization, precision treatment, easy operation, and no drug resistance, which has shown important application potential in the imaging and treatment of cancer cells and drug-resistant bacteria. Photosensitizer (PS) is an important part of PDT, and its fluorescence and reactive oxygen species (ROS) efficiency directly affect phototherapeutic effect. Traditional methods mainly enhance the intramolecular charge transfer or introduction of the heavy atom effect to promote the intersystem crossing (ISC) process to produce more triplet energy, but seriously quenching the fluorescent efficiency of the PS. Therefore, it is important to develop molecular engineering that can improve simultaneously the fluorescence and ROS efficiency of PS. This work reports a strategy to improve the molecular molar absorption coefficient by introducing fusing ring units with different rigidity between the electronic donor and acceptor, which not only improves the photoluminescence quantum efficiency, but also greatly improving the efficiency of producing type I/II ROS. Using triphenylamine as electronic donor and cationic pyridine as acceptor, three cationic PSs (TPA-B-PI, TPA-N-PI and TPA-Py-PI) with different molar absorption coefficients were designed and prepared by introducing benzene, naphthalene and pyrene rings between electronic donor and acceptor. The photophysical and photo-sensitive properties of the PSs were researched in detail. Experimental results showed that, owing to the larger absorption cross section of pyrene molecule, TPA-Py-PI exhibited a superior molar absorption coefficient. Furthermore, more singlet and triplet excitons were generated after excitation, resulting in the best fluorescence quantum efficiency and type I/II ROS efficiency. The results of photodynamic antibacterial experiment showed that the TPA-Py-PI had good antibacterial effect on Staphylococcus aureus (S. aureus), drug-resistant Staphylococcus aureus (MRSA) and Escherichia coli (E. coli). Moreover, TPA-Py-PI achieved good antibacterial efficiency of 99.99% against MRSA at low concentration (25 nmol/L) and irradiation dose (20 mW/cm2).

Key words: photodynamic therapy, cationic photosensitizer, molar absorbance coefficient, antibacterial