• 文献标题:   Electrochemical biosensor based on pyruvate oxidase immobilized AuNRs@Cu2O-NDs as electroactive probes loaded poly (diallyldimethylammonium chloride) functionalized graphene for the detection of phosphate
  • 文献类型:   Article
  • 作  者:   HE BS, LIU H
  • 作者关键词:   phosphate, pyruvate oxidase, aunrs@cu2onds/pddagr, electrochemical biosensor
  • 出版物名称:   SENSORS ACTUATORS BCHEMICAL
  • ISSN:  
  • 通讯作者地址:   Henan Univ Technol
  • 被引频次:   3
  • DOI:   10.1016/j.snb.2019.127303
  • 出版年:   2020

▎ 摘  要

A novel and sensitive electrochemical biosensor for the detection of phosphate was constructed using AuNRs@Cu2O-NDs loaded poly (diallyldimethylammonium chloride) functionalized graphene immobilized pyruvate oxidase (PyO). In this study, PDDA-Gr with good conductive ability was firstly used to increase the active site and serve as supporting substrate of biosensor. Subsequently, the AuNRs@Cu2O-NDs composite material was prepared to enhanced capability for PyO immobilization and achieved rapid electron transfer between hydrogen peroxide and Cu2O-NDs to amplify the electrical signal. Additionally, AuNRs@Cu2O-NDs loaded PDDA-Gr had good biocompatibility and yielded superior current response. The surface concentration (T) of electroactive PyO on the surface of AuNRs@Cu2O-NDs/PDDA-Gr/AuE is estimated as 7.65 x 10(-10) mol cm(-2). Under the optimal conditions, the proposed biosensor showed a wide linearity range from 0.01 to 80 mu M and a low detection limit of 0.4 nM by differential pulse voltammetry. Through a series of assessments, the biosensor exhibited satisfactory anti-interference, good stability, excellent reproducibility and successfully applied to the monitoring of phosphate content in food.