4.7 Article

Iron ion sensing and in vitro and in vivo imaging based on bright blue-fluorescent carbon dots

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2021.119964

关键词

Blue fluorescence; Carbon dots; Iron ion; Imaging; Sensing

资金

  1. National Natural Science Foundation of China [21874087]
  2. Shanxi Province Hundred Talent Project

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This study introduces an eco-friendly synthesis method for carbon dots and a label-free sensing platform for ultrasensitive Fe3+ recognition. The CDs prepared through hydrothermal strategy exhibit exceptional stability and biocompatibility, making them suitable for multicolour imaging applications.
Herein, we propose an eco-friendly synthesis of carbon dots (CDs) and ingeniously design a rapid and label-free turn-off sensing platform for ultrasensitive recognition of Fe3+ in vitro and in vivo. CDs with extraordinary advantages involving exceptional stability, ultra-low toxicity as well as admirable biocom-patibility were simply prepared via one-step hydrothermal strategy of Caulis polygoni multiflora. Result indicated that as-acquired CDs not only exhibit excitation dependency, but also have a high quantum yield of (QY) up to 42%. Miraculously, the fluorescence of CDs can be extinguished sharply by Fe3+ because of static quenching effect with linear range of 0-400 mu M, yielding a detection limit of 0.025 mu M. Benefiting from these characteristics, CDs have been extended for multicolourful imaging and tracking Fe3+ fluctuations in living cells. Bioimaging of zebrafish larvae exposed to CDs confirmed that it is smoothly circulated to other tissues and organs owing to their small size. Eventually, as-prepared CDs have been implemented for the real-time detection of Fe3+ in nude mice. (C) 2021 Elsevier B.V. All rights reserved.

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