高等学校化学学报 ›› 2026, Vol. 47 ›› Issue (11): 20260095.doi: 10.7503/cjcu20260095

• 研究论文: 无机化学 • 上一篇    下一篇

铁/锰比例调控的双金属纳米酶用于有机磷农药比色传感

张应鹏(), 刘娟娟, 秦凡凡, 杨云裳, 胡赜太   

  1. 兰州理工大学石油化工学院,兰州 730050
  • 收稿日期:2026-03-06 出版日期:2026-11-10 发布日期:2026-05-26
  • 通讯作者: 张应鹏 E-mail:yingpengzhang@126.com
  • 基金资助:
    国家自然科学基金(21968016)

Iron/manganese Ratio-regulated Bimetallic Nanoenzymes for Colorimetric Sensing of Organophosphorus Pesticides

ZHANG Yingpeng(), LIU Juanjuan, QIN Fanfan, YANG Yunshang, HU Zetai   

  1. School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China
  • Received:2026-03-06 Online:2026-11-10 Published:2026-05-26
  • Contact: ZHANG Yingpeng E-mail:yingpengzhang@126.com
  • Supported by:
    the National Natural Science Foundation of China(21968016)

摘要:

以自合成的4,4',4''-三甲酸三苯胺(H₃TCA)为有机配体, 通过调控铁掺杂比例, 采用溶剂热法制备了一系列双金属纳米酶材料Fe x Mn-NC. 其中, Fe与Mn摩尔比为2:1时制得的Fe₂Mn-NC的类过氧化物酶活性最突出, 其催化效率显著高于单金属体系, 且表现出明显的组分依赖性. 酶动力学分析结果表明, Fe₂Mn-NC对底物3,3',5,5'-四甲基联苯胺(TMB)和H₂O₂展现出优异的亲和力, 对应的米氏常数(Kₘ)分别低至0.36和 0.1 mmol/L. 基于Fe x Mn-NC的类酶催化性能, 采用乙酰胆碱酯酶抑制法, 通过乙酰胆碱酯酶-硫代胆碱级联反应实现“开-关-开”信号调控, 构建了高特异性紫外传感平台. 该平台对甲基对硫磷表现出良好的识别能力, 在10~330 nmol/L范围内, 652 nm处的吸光度与甲基对硫磷浓度呈线性关系, 检出限低至3.04 nmol/L.

关键词: 4, 4', 4''-三甲酸三苯胺, 纳米酶, 类酶活性, 乙酰胆碱酯酶, 甲基对硫磷检测

Abstract:

Using self-synthesized 4,4',4''-tricarboxytriphenylamine(H3TCA) as an organic ligand, a series of bimetallic nanoenzyme materials Fe x Mn-NC was synthesized via a solvothermal method by regulating the iron doping ratio. Among these, when the molar ratio of Fe to Mn is 2∶1, the Fe₂Mn-NC composition exhibited the most optimal peroxidase-like catalytic activity, with a significantly higher catalytic efficiency than single-metal systems and a pronounced composition dependence. Enzyme kinetic analysis revealed that Fe2Mn-NC exhibits exceptional affinity for substrates 3,3′,5,5′-tetramethylbenzidine(TMB) and H2O2, with corresponding Michaelis-Menten constants (Kₘ) as low as 0.36 and 0.1 mmol/L, respectively. Based on the material's outstanding catalytic properties, an “on-off-on” type UV sensing platform was constructed using the acetylcholinesterase-thiocholine cascade reaction. This platform demonstrated excellent analytical performance in methyl parathion detection, with a detection limit as low as 3.04 nmol/L and a linear range of 10—330 nmol/L.

Key words: 4, 4', 4''-Tricarboxytriphenylamine, Nanozyme, Enzyme-like activity, Acetylcholinesterase, Detection of methyl parathion

中图分类号: 

TrendMD: