Cationic cyanine chromophore-assembled upconversion nanoparticles for sensing and imaging H 2 S in living cells and zebrafish

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Abstract

Elevated hydrogen sulfide (H 2 S) level is closely associated with various diseases. So the sensing of H 2 S is noteworthy for divulging its role in diagnosing these diseases. Herein, we proposed poly(acrylic acid)-modified upconversion nanoparticles assembled with cationic near-infrared cyanine chromophores (Cy7-Cl) as the nanoprobe (Cy7-UCNPs) for monitoring H 2 S based on thiolation reactions. The presence of H 2 S resulted into about five-fold enhancement in the luminescence intensity of Cy7-UCNPs and the nanoprobe showed a good linearity (R 2 =0.9952) over the range of 1.0 − 90 μM. Furthermore, Cy7-UCNPs were successfully employed in sensing and imaging of exogenous and endogenous H 2 S in live cells and zebrafish. The system shows great potential in the field of nanobiomedicine because of the many excellent properties including high sensitivity, good selectivity, and low cytotoxicity.

Original languageEnglish
Pages (from-to)96-101
Number of pages6
JournalBiosensors and Bioelectronics
Volume126
DOIs
StatePublished - 1 Feb 2019

Keywords

  • Bioimaging
  • Chromophore
  • Hydrogen sulfide (H S)
  • Turn-on fluorescent probe
  • Upconversion nanoparticles

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