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      Preparation of highly crystalline nitrogen-doped carbon dots and their application in sequential fluorescent detection of Fe3+ and ascorbic acid.

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          Abstract

          Carbon dots (CDs) have been a new class of fascinating carbon-based fluorescent nanomaterials. In the present work, new N-doped CDs with highly crystalline graphite structures are prepared from renewable precursors, chitosan and tartaric acid, and are well characterized. The prepared CDs are applied as a biocompatible fluorescent sensor for the sequential detection of Fe3+ and AA. Among various transition metal ions, Fe3+ can selectively quench the fluorescence of CDs. Upon the further addition of AA, the quenched fluorescence of CDs is then restored as Fe3+ is reduced to Fe2+ by AA, which can be utilized for the fluorescent determination of AA. A good linear relationship in the range of 0-150 μM of AA concentration is established with a low detection limit of 0.02 µM. Moreover, the practical applications of this fluorescent sensing method in measurement of AA in food samples are successfully realized with satisfactory results.

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          Author and article information

          Journal
          Food Chem
          Food chemistry
          Elsevier BV
          1873-7072
          0308-8146
          Oct 01 2020
          : 326
          Affiliations
          [1 ] College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, PR China.
          [2 ] College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, PR China. Electronic address: huangjy@zjgsu.edu.cn.
          [3 ] College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, PR China. Electronic address: wangxiangyang@zjsu.edu.cn.
          Article
          S0308-8146(20)30797-4
          10.1016/j.foodchem.2020.126935
          32447160
          a0dff183-7542-47cb-8bbf-dbb9b3138966
          Copyright © 2020 Elsevier Ltd. All rights reserved.
          History

          Fluorescent detection,Chitosan,Carbon dots,Ascorbic acid

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