高等学校化学学报 ›› 2025, Vol. 46 ›› Issue (1): 20240341.doi: 10.7503/cjcu20240341

• 研究论文 • 上一篇    下一篇

组分可调的PdRh双金属纳米酶用于亚硝酸盐精准高效比色传感

唐玉玺1,2, 杨启2(), 直鑫鹏1,2, 陈梦媛2, 刘思源2, 李嘉昌2, 刘梓洋2, 贾会敏2, 仝玉萍1(), 何伟伟2   

  1. 1.华北水利水电大学材料学院,郑州 450045
    2.河南省微纳米能量储存与转换材料重点实验室,许昌学院化工与材料学院表面微纳米材料研究所,许昌 461000
  • 收稿日期:2024-07-05 出版日期:2025-01-10 发布日期:2024-08-15
  • 通讯作者: 杨启 E-mail:yangq@xcu.edu.cn;yptong_zz@163.com
  • 作者简介:仝玉萍, 女, 博士, 教授, 主要从事纳米催化材料设计与生物应用方面的研究. E-mail: yptong_zz@163.com
  • 基金资助:
    国家自然科学基金(62274141);河南省科技攻关项目(242102230074)

Component-tunable PdRh Bimetallic Nanozyme for Ultra-sensitive Colorimetric Detection of Nitrite

TANG Yuxi1,2, YANG Qi2(), ZHI Xinpeng1,2, CHEN Mengyuan2, LIU Siyuan2, LI Jiachang2, LIU Ziyang2, JIA Huimin2, TONG Yuping1(), HE Weiwei2   

  1. 1.School of Materials Science and Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450045,China
    2.Key Laboratory of Micro?Nano Materials for Energy Storage and Conversion of Henan Province,Institute of Surface Micro and Nano Materials,College of Chemical and Materials Engineering,Xuchang University,Xuchang 461000,China
  • Received:2024-07-05 Online:2025-01-10 Published:2024-08-15
  • Contact: YANG Qi E-mail:yangq@xcu.edu.cn;yptong_zz@163.com
  • Supported by:
    the National Natural Science Foundation of China(62274141);the Key Scientific and Technological Project of Henan Province, China(242102230074)

摘要:

采用无模板一锅水热法, 通过调控钯(Pd)与铑(Rh)摩尔比, 制备了系列PdRh双金属纳米酶(Pd3Rh, PdRh和PdRh3), 并研究了其类过氧化物酶(POD-like)及类氧化酶(OXD-like)活性. 结果表明, 双金属纳米酶的催化活性比单金属纳米酶(Pd和Rh)更高, 且表现出明显的组分依赖性. 其中, PdRh3和PdRh分别表现出最强的POD-like和OXD-like活性. 酶促动力学分析表明, PdRh3纳米酶以3,3',5,5'-四甲基联苯胺(TMB)和H2O2为底物的米氏常数(Km)分别为15.65和381.99 μmol/L, 对应的最大反应速率(vmax)分别为8.40×10-8和11.01×10-8 mol/(L·s). 此外, PdRh3纳米酶的POD-like活性表现出pH依赖性, 在pH=5时活性最佳. 在此条件下, 开发了基于PdRh3纳米酶的比色传感体系, 根据445和652 nm处吸光度比值(A445 nm/A652 nm)与亚硝酸根离子(NO2- )浓度的线性关系, 实现了对溶液中亚硝酸盐浓度的快速定量检测. 结果表明, 在pH=5的缓冲溶液和纯水中, 该体系检出限分别为0.467和30.523 μmol/L, 且在多种盐离子干扰下特异性良好, 在生物传感中具有较大应用潜力.

关键词: 纳米酶, 组分调控, 类酶活性, 亚硝酸盐检测

Abstract:

A series of bimetallic nanozymes(Pd3Rh, PdRh, PdRh3) was prepared using one-pot hydrothermal method by adjusting the ratio of palladium(Pd) to rhodium(Rh). The peroxidase-like(POD-like) and oxidase-like(OXD-like) activities of nanozymes were tested. The results showed that the catalytic activity of bimetallic nanozymes was significantly enhanced compared to that of single metallic nanozymes(Pd, Rh). The POD-like and OXD-like activities exhibited obvious component dependence, and PdRh3 and PdRh nanozyme showed the strongest POD-like and OXD-like activity, respectively. The analysis of enzymatic kinetics showed that the Michaelis-Menten constant (Km) of PdRh3 nanozyme with 3,3',5,5'-tetramethylbenzidine(TMB) and H2O2 as substrates are 15.65 and 381.99 μmol/L, respectively. The corresponding maximum velocity(vmax) reach 8.40×10-8 and 11.01×10-8 mol/(L·s). In addition, the POD-like activity of PdRh3 nanozyme was pH-dependent, and the optimized activity was obtained at pH=5. A colorimetric sensing system was developed based on PdRh3 nanozyme, which realized the rapid quantitative detection of nitrite concentration in solution according to the fitting relationship between the absorbance ratio(A445 nm/A652 nm) and the concentration of nitrite ion(NO2-). The limit of detection(LOD) in pH=5 buffer and pure water are 0.467 and 30.523 μmol/L, respectively, and the system has a good specificity under the interference of various salt ions, demonstrating great application potential in biosensing.

Key words: Nanozymes, Component regulation, Enzyme-like activity, Nitrite detection

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