Acta Chim. Sinica ›› 2016, Vol. 74 ›› Issue (11): 917-922.DOI: 10.6023/A16080430 Previous Articles     Next Articles



纪光, 闫路林, 王慧, 马莲, 徐斌, 田文晶   

  1. 吉林大学 化学学院超分子结构与材料国家重点实验室 长春 130012
  • 投稿日期:2016-08-24 发布日期:2016-11-24
  • 通讯作者: 徐斌, 田文晶;
  • 基金资助:


Efficient Near-infrared AIE Nanoparticles for Cell Imaging

Ji Guang, Yan Lulin, Wang Hui, Ma Lian, Xu Bin, Tian Wenjing   

  1. State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012
  • Received:2016-08-24 Published:2016-11-24
  • Supported by:

    Project supported by 973 Program (No. 2013CB834701), the Natural Science Foundation of China (Nos. 51373063, 51573068, 21221063) and Program for Chang Jiang Scholars and Innovative Research Team in University (No. IRT101713018).

Near-infrared fluorescence signals are highly desirable to acheieve high resolution in biological imaging. We encapsulated hydrophobic AIE (aggregation-induced emission) fluorophores into the biocompatible Pluronic F-127 NPs for cellular imaging and efficiently enhance the near-infrared AIE fluorophore emission. AIE molecule 2-(4-bromophenyl)-3-(4-(4-(diphenylamino)styryl)phenyl) fumaronitrile (TPABDFN) with near-infrared emission was synthesized and selected as the fluorescence resonance energy transfer (FRET) acceptor. (2-p-tolylethene-1,1,2-triyl)tribenzene (TPE-Me) was a blue-emitting AIE molecule, which spectrum was matching with TPABDFN. TPE-Me@F127 NPs emission was 480 nm, TPABDFN@F127 NPs maximum absorption wavelength was also 480 nm, that the absorption had a large area of overlapping with the TPE-Me@F127 NPs emission spectrum and leaded to efficient energy transfer, so TPE-Me was selected as the FRET donor. By encapsulating both TPE-Me donor and TPABDFN acceptor simultaneously within the NPs, a significant FRET effect was induced. FRET pairs of different ratios was co-encapsulated into the F127 NPs to optimize the fluorescence signals. The maximum of fluorescence quantum yield was 19.9%, energy transfer efficiency was 43.5%. TPABDFN@F127 NPs only had weak fluorescence, but the TPABDFN/TPE-Me@F127 NPs showed bright fluorescence signal. Fluorescence resonance energy transfer contributed to the notable increase of acceptor emission The fluorescence quantum yield had 10-fold enhancement of the TPABDFN. In addition, the obtained TPABDFN/TPE-Me@F127 NPs showed a large Stokes shift of 265 nm, which can be used to avoid the interference between excitation and emission light, as well as the near-infrared emission spectrum away from the organism auto-fluorescence, which was beneficial for the bio-application. Fluorescent probe emission in the far red/near-infrared (FR/NIR) (650~900 nm) region for biological detection also can greatly reduce the damage to living body. And TPABDFN/TPE-Me@F127 NPs had low cytotoxicity, good biocompatibility, stability and anti-photobleaching. The TPABDFN/TPE-Me@F127 NPs achieved good imaging result on HepG2 cell cytoplasm.

Key words: aggregation-induced emission, energy transfer, self-assembly, nanoparticles, cell imaging