A facile fluorescent sensor based on nitrogen-doped carbon dots derived from Listeria monocytogenes for highly selective and visual detection of iodide and pH |
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| Authors: | Mingsha Jie Ruipeng Guo Yanan Zhang Jianing Huang Gaigai Xu Min Li Xiaoyue Yue Baocheng Ji Yanhong Bai |
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| Institution: | College of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou Henan Province 450001 P. R. China, Fax: +86-28-82890825, +86-28-82890810 ; Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Zhengzhou Henan Province 450001 P. R. China ; School of Mechanical and Electrical Engineering, Henan Vocational College of Applied Technology, Zhengzhou Henan Province 450042 P. R. China |
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| Abstract: | Sensitive and visual analysis of iodide (I−) and pH is significant in environmental and food applications. Herein, we present a facile fluorescent sensor for highly selective and visual detection of I− and pH based on nitrogen-doped carbon dots derived from Listeria monocytogenes (NCDs-LM). The NCDs-LM-based fluorescent sensor showed a good linear relationship to I− concentrations, and the detection limit was calculated as 20 nmol L−1. The developed sensor was successfully applied to the detection of I− in drinking water and milk samples. Meanwhile, the as-synthesized NCDs-LM sensor can be used to detect pH, achieving a wide linear pH range. Furthermore, fluorescent test papers based on NCDs-LM were designed for semi-quantitative detection of I− and pH via the naked-eye colorimetric assay. The present work indicates that the NCDs-LM-based fluorescent sensor has high potential for use in environmental monitoring and food analysis. Listeria monocytogenes-derived nitrogen-doped carbon dots served as a facile fluorescent sensor with excellent sensing performances for iodide with low detection limit of 20 nmol L−1 and wide pH range from 1.81 to 11.82. |
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