Journal
JOURNAL OF BIOMEDICAL NANOTECHNOLOGY
Volume 14, Issue 9, Pages 1543-1555Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jbn.2018.2610
Keywords
Carbon Dots; Biosensing; Fluorescent Quenching; Metal Ions
Funding
- National Science Foundation of China [51673072]
- Independent Study Projects of the State Key Laboratory of Pulp and Paper Engineering [2016TS01, 2017C04]
- Fundamental Research Funds for the Central Universities, SCUT [2017ZD077]
- National Program for Support of Top-notch Young Professionals of China
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A sensitive and reversible sensing platform based on fluorescent carbon dots (CDs) allowing capture and detection of metal ions is of significance for developing diagnostic probes and in-situ environmental-monitoring. Here, a simple and effective method for converting biomass lignin into fluorescent CDs is developed. The obtained CDs, with stable fluorescence and excellent water solubility, are fabricated as unique model biosensors to access the metal-induced quenching mechanism. It is demonstrated that selective fluorescence quenching behaviors of lignin CDs are firstly found related to the valence-state of metal ions. Moreover, a reversible control of CDs fluorescence is realized by introducing reducing agents. This novel biosensor and the approach to quenching mechanism may evoke new insight in designing ions-sensor and monitoring biologic redox signal.
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