Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (12): 20220392.doi: 10.7503/cjcu20220392

• Article • Previous Articles     Next Articles

Small-molecule-based Thermosensitive Polymer Nanoparticles for NIR-Ⅱ Fluorescence Imaging and Photothermal Therapy

CHEN Shangyu, SHEN Qingming, SUN Pengfei, FAN Quli()   

  1. Institute of Advanced Materials,Nanjing University of Posts & Telecommunications,Nanjing 210023,China
  • Received:2022-06-05 Online:2022-12-10 Published:2022-08-02
  • Contact: FAN Quli E-mail:iamqlfan@njupt.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21604042);the Natural Science Foundation of Jiangsu Province, China(BK20201380);the Natural Science Foundation of Jiangsu Higher Education Institutions, China(20KJA430012)

Abstract:

An organic small molecule 4,9-bis[5-(9H-fluoren-2-yl)thiophen-2-yl]-6',7-diphenyl-[1,2,5]thiadiazolo[3,4-g]quinoxaline(TQF) was selected as a precursor, followed by chemical modification into a small molecular chain transfer agent—TQF-phenylthio chain transfer agent(CTA), which enabled the reversible addition-fragmentation chain transfer polymerization(RAFT). Then, the copolymer[TQF-P(NIPAAm-co-OEGMA), abbreviated as TPNO] with good water solubility and lower critical solution temperature(LCST) was synthesized by RAFT with TQF-CTA as the chain transfer agent, azobisisobutyronitrile as initiator, as well as thermosensitive N-isopropylacrylamide(NIPAAm) and hydrophilic oligoethylene glycol methacrylate(OEGMA) as the monomers. TPNO was directly dissolved in water to prepare the thermosensitive spherical nanoparticles TQNO NPs. The results showed that TQNO NPs exhibited an obvious particle size change and a significant fluorescence enhancement behavior(2.2 times) when the test temperature was greater than LCST(35 ℃), and successfully achieved bright second near-infrared(NIR-Ⅱ) fluorescence imaging(FI) of blood vessels and tumors in living mice. Meanwhile, TQNO NPs displayed a good photothermal conversion efficiency(PCE=29.8%), and the in vitro cell experiments had successfully proved its desirable photothermal therapy(PTT) effect.

Key words: Second near-infrared, Thermosensitive polymer, Nanoparticles, Fluorescence imaging, Photothermal therapy

CLC Number: 

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