Journal
ACS SENSORS
Volume 1, Issue 4, Pages 392-398Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.5b00230
Keywords
nitronyl-nitroxide; ascorbic acid; fluorescence; electron spin resonance; sensor
Funding
- National Research Foundation of Korea (NRF) - Korean Government (MSIP) [2009-0081671 [RIAM0417-20150013]]
- Air Force Office of Scientific Research (AFOSR) [FA23861214008]
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A novel nitronyl-nitroxide derivative for highly sensitive and selective detection of ascorbic acid (AA) is reported. The probe showed 260-fold fluorescence turn-on and diminished electron spin resonance (ESR) signal upon AA addition. The probe could detect AA over a broad concentration range from 1 mu M to 2 mM and excellent selectivity over various antioxidants and acids through a combination of fluorescence and ESR responses, which originated from the dual reactiveness of dual-quenching group nitronyl-nitroxide. We successfully demonstrated practical application potential of the probe by preparing nanoparticles and sensor papers and determining AA concentration in real samples including vitamin drinks and orange juices.
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