应用化学 ›› 2025, Vol. 42 ›› Issue (3): 321-329.DOI: 10.19894/j.issn.1000-0518.240222

• 研究论文 • 上一篇    下一篇

基于ZnS修饰电极构建光电化学生物传感器测定L-半胱氨酸

陈结霞, 刘卓尔, 鹿长宁, 杨可欣, 陈紫艳, 尉艳()   

  1. 皖南医学院药学院,芜湖 241002
  • 收稿日期:2024-07-21 接受日期:2025-01-21 出版日期:2025-03-01 发布日期:2025-04-11
  • 通讯作者: 尉艳
  • 基金资助:
    安徽高校自然科学研究重大项目(2023AH040250);安徽高校自然科学研究重点项目(KJ2021A0842);大学生科研资助金项目(WK2023XS43)

Construction of a Photoelectrochemical Biosensor Based on ZnS-Modified Electrode for the Determination of L-Cysteine

Jie-Xia CHEN, Zhuo-Er LIU, Chang-Ning LU, Ke-Xin YANG, Zi-Yan CHEN, Yan WEI()   

  1. School of Pharmacy,Wannan Medical College,Wuhu 241002,China
  • Received:2024-07-21 Accepted:2025-01-21 Published:2025-03-01 Online:2025-04-11
  • Contact: Yan WEI
  • About author:yanwei@wnmc.edu.cn
  • Supported by:
    the Research Fund for Major Natural Science Research Projects in Universities of Anhui Province(2023AH040250);the University Natural Science Research Project of Anhui Province(KJ2021A0842);the Undergraduate Research Grants Programme(WK2023XS43)

摘要:

血清半胱氨酸(L-Cysteine,L-Cys)水平与多种疾病有关,对其进行高灵敏检测具有重要意义。 通过电化学沉积法制备硫化锌(ZnS)纳米修饰电极,构建一种基于光电化学催化氧化策略选择性检测L-Cys的新方法。 光照下,ZnS纳米粒子形成电子-空穴对。 溶液中L-Cys上的巯基(—SH)提供电子占据空穴,同时L-Cys失去电子形成含二硫键(—S—S—)的胱氨酸,完成自身光电化学催化氧化过程,形成光电流,从而实现L-Cys的测定。 该光电化学传感器对L-Cys在2~50 μmol/L的响应范围内检测限为0.67 μmol/L。 该传感器成功应用于人血清中L-Cys的检测,回收率范围为97.6%~104.6%。

关键词: 光电化学分析, 硫化锌, L-半胱氨酸

Abstract:

L-Cysteine(L-Cys) levels in serum are correlated with many diseases, and their highly sensitive detection is of great significance. A novel strategy for selective detection of L-Cys based on photoelectrochemical catalytic oxidation was developed utilizing the electrochemical deposition of ZnS nanomodified electrodes. Under light irradiation, ZnS nanoparticle underwent a process of electron-hole pair formation. The thiol groups (—SH) on L-Cys in the solution provided electrons to occupy the holes, and the photoinduced electrons on the conduction band were injected into the ITO electrode to form an anodic photocurrent. Meanwhile, the L-Cys in the solution underwent a reduction process, whereby electrons were transferred to form cystine containing disulfide bridge (—S—S—), which then underwent a photoelectrochemical catalytic oxidation process. The photoelectric conversion efficiency was improved. The photocurrent of the sensor based on the photochemical catalytic oxidation mechanism increased linearly in the concentration range of 2~50 μmol/L, and obtained the detection limit of 0.67 μmol/L. This method was applied to determine the content of L-Cys in human serum, and the recovery rates were in the range of 97.6% to 104.6%.

Key words: Photoelectrochemical analysis, ZnS, L-Cysteine

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