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Sensors and actuators. B, Chemical v.259, 2018년, pp.1133 - 1143   SCI SCIE SCOPUS
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Sensitive and selective turn-off-on fluorescence detection of Hg2+ and cysteine using nitrogen doped carbon nanodots derived from citron and urine

Xavier, S. Stanly John (Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India ) ; Siva, G. (Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India ) ; Annaraj, J. (Department of Materials Science, School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India ) ; Kim, Ae Rhan (R&D Center for CANUTECH, Business Incubation Center and Department of Bioenvironmental Chemistry, Chonbuk National University, Jeollabuk-do 54896, Republic of Korea ) ; Yoo, Dong Jin (Department of Life Science, Department of Energy Storage/Conversion Engineering of Graduate School, and Hydrogen and Fuel Cell Research Center, Chonbuk National University, Jeollabuk-do 54896, Republic of Korea ) ; kumar, G. Gnana (Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India ) ;
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    Abstract An environmentally benign and cost efficient cysteine fluorescence sensor is constructed on the basis of nitrogen doped carbon nanodots (NCNDs) prepared by using citron fruit extract and human urine waste as carbon and nitrogen sources, respectively. The turn-off-on fluorescence technique is exploited for the sensing of cysteine, in which the initial fluorescence of NCNDs is quenched with Hg 2+ via an electron transfer process. Owing to the competitive binding of Hg 2+ with cysteine, the ‘turn-off’ fluorescence sensor is switched to the ‘turn-on’ state. Under optimized conditions, NCNDs-Hg 2+ assembly demonstrates a lower detection limit and a wide linear range toward cysteine detection. Furthermore, NCNDs display the discriminative detection of cysteine from the similar bioactive molecules and the co-existence of interference species does not influence the detection of NCNDs toward the interest of an analyte. Furthermore, the practical application of NCNDs based fluorescence sensor is validated with the good recovery in human urine samples, which explores the new avenues in the fluorescence sensing of biomolecules. Highlights Environmentally benign NCNDs are prepared from citron and human urine. Turn-off-on fluorescence technique is exploited for the cysteine sensing. Fluorescence behavior of NCNDs is quenched with Hg 2+ and is regenerated with cysteine. NCNDs exhibit rapid fluorometric response with a LOD of 40 nM toward cysteine. NCNDs demonstrate selective cysteine detection and real sample analysis. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Carbon nanodots .   Hydrothermal carbonization .   Nitrogen doping .   Turn-off-on sensing .   Urine.  

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