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Microchimica Acta

, 185:269 | Cite as

A fluorescent nanoprobe for real-time monitoring of intracellular singlet oxygen during photodynamic therapy

  • Jian-tao Ping
  • Hong-shang Peng
  • Jinglei Qin
  • Fang-tian You
  • Yi-quan Wang
  • Gen-xiang Chen
  • Min Song
Original Paper
  • 269 Downloads

Abstract

Sensing of intracellular singlet oxygen (1O2) is required in order to optimize photodynamic therapy (PDT). An optical nanoprobe is reported here for the optical determination of intracellular 1O2. The probe consists of a porous particle core doped with the commercial 1O2 probe 1,3-diphenylisobenzofuran (DPBF) and a layer of poly-L-lysine. The nanoparticle probes have a particle size of ~80 nm in diameter, exhibit good biocompatibility, improved photostability and high sensitivity for 1O2 in both absorbance (peak at 420 nm) and fluorescence (with excitation/emission peaks at 405/458 nm). Nanoprobes doped with 20% of DPBF are best suited even though they suffer from concentration quenching of fluorescence. In comparison with the commercial fluorescent 1O2 probe SOSG, 20%-doped DPBF-NPs (aged) shows higher sensitivity for 1O2 generated at an early stage. The best nanoprobes were used to real-time monitor the PDT-triggered generation of 1O2 inside live cells, and the generation rate is found to depend on the supply of intracellular oxygen.

Graphical abstract

A fluorescent nanoprobe featured with refined selectivity and improved sensitivity towards 1O2 was prepared from the absorption-based probe DBPF and used to real-time monitoring of the generation of intracellular 1O2 produced during PDT.

Keywords

Concentration quenching Core-shell Dissolved oxygen Bleach DPBF 

Notes

Acknowledgments

This work was financially supported by the NSFC (Grants 61775245, 61627814, 61675238) and the MUC 111 project.

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2018_2815_MOESM1_ESM.doc (3.6 mb)
ESM 1 (DOC 3715 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  • Jian-tao Ping
    • 1
    • 2
  • Hong-shang Peng
    • 1
  • Jinglei Qin
    • 1
  • Fang-tian You
    • 2
  • Yi-quan Wang
    • 1
  • Gen-xiang Chen
    • 1
  • Min Song
    • 1
  1. 1.School of ScienceMinzu University of ChinaBeijingChina
  2. 2.Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic TechnologyBeijing Jiaotong UniversityBeijingChina

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