Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (9): 20240251.doi: 10.7503/cjcu20240251

• Analytical Chemistry • Previous Articles    

Preparation of NPCl-CDs/Fe 3+ Fluorescent Probe and the Detection for L -Cys

XU Xiaohua, WANG Li, LIN Pengcheng, MA Tianfeng, SHI Lin, WANG Huan(), LU Yongchang()   

  1. Modern Tibetan Medicine Creation Engineering Technology Research Center of Qinghai Province,College of Pharmacy,Qinghai Minzu University,Xining 810007,China
  • Received:2024-05-23 Online:2024-09-10 Published:2024-07-22
  • Contact: WANG Huan, LU Yongchang E-mail:qhmuwh1028@126.com;qhlych@126.com
  • Supported by:
    the Natural Science Foundation of Qinghai Province, China(2019-ZJ-944Q);the Project of the Key Laboratory of Phytochemistry on Qinghai-Tibet Plateau, Qinghai Province, China, the Project of the Engineering and Technology Research Center for the Creation of Modern Tibetan Medicine, Qinghai Province, China, and the Project of the Innovation Team for Conservation and High-Value Utilization of Medicinal Herb Resources, Qinghai Province, China(2021XJPI02)

Abstract:

In this work, a blue-green NPCl-CDs was synthesized by one-step hydrothermal method using glucose, ethylenediamine, concentrated hydrochloric acid and concentrated phosphoric acid as reaction precursors. Then NPCl-CDs/Fe 3+ fluorescent probe was constructed for the quantitative detection of L-Cys in actual samples. The fluorescence intensity of NPCl-CDs could be quenched after addition of Fe 3+. The fluorescence intensity of the NPCl-CDs/Fe 3+system was restored when L-Cys was introduced into the system. Therefore, a novel "on-off-on" NPCl-CDs/Fe 3+- L-Cys fluorescence sensing system for L-Cys quantitative detection was constructed. This experiment showed a wide linear region in the concentration range of 5.8—60.0 µmol/L with a detection limit of 0.052 µmol/L. The results indicated that the fluorescence sensing system had good selectivity, sensitivity and potential application value for the detection of L-Cys in real samples.

Key words: NPCl-CDs, Fe 3+, L-Cysteine, Fluorescence sensing

CLC Number: 

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