广西师范大学学报(自然科学版) ›› 2013, Vol. 31 ›› Issue (3): 191-196.

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适配体修饰纳米金催化共振瑞利散射光谱法测定血红素

董金超, 温桂清, 刘庆业, 梁爱惠, 蒋治良   

  1. 广西师范大学环境与资源学院,广西桂林541004
  • 收稿日期:2013-04-16 出版日期:2013-09-20 发布日期:2018-11-26
  • 通讯作者: 蒋治良(1965—),男,广西桂林人,广西师范大学教授,博导。E-mail:zljiang@mailbox.gxnu.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(21267004,21165005);广西自然科学基金资助项目(2013GXNSFFA019003);广西高校科研项目(2013YB035)

Nanocatalytic Resonance Rayleigh Scattering Determination of Trace Hemin Using Aptamer-Modified Nanogold Probe

DONG Jin-chao, WEN Gui-qing, LIU Qing-ye, LIANG Ai-hui, JIANG Zhi-liang   

  1. College of Environment and Resource,Guangxi Normal University,Guilin Guangxi 541004,China
  • Received:2013-04-16 Online:2013-09-20 Published:2018-11-26

摘要: 适配体(aptamer)与纳米金结合形成稳定的适配体修饰纳米金共振瑞利散射光谱探针(AussDNA),且不被NaCl聚集。在pH8的Tris-HCl缓冲溶液中,血红素与AussDNA中的aptamer作用形成稳定的结合物并释放出纳米金,纳米金被高浓度NaCl聚集成较大粒径的纳米金颗粒,导致367.6 nm处体系的共振瑞利散射光强度增大,共振瑞利散射峰的增大值ΔI367.6 nm与血红素在5~750 nmol/L范围内呈良好的线性关系,回归方程为:ΔI=2.4C+144.4,相关系数R2=0.982 9,检出限为66 pmol/L。该法用于分析测定人体血清中残留的血红素,结果满意。适配体反应液中未反应的AussDNA纳米金探针对葡萄糖-斐林试剂反应具有较强的催化作用,其产物氧化亚铜微粒在370 nm处有一较强共振瑞利散射峰。随着血红素浓度的增加,反应液中AussDNA减少,催化作用减弱,370 nm处共振瑞利散射峰强度降低,共振瑞利散射峰的降低值ΔI370 nm与血红素在0.25~200 nmol/L范围内呈良好的线性关系,回归方程为ΔI370 nm=5.5C+78,相关系数R2=0.971 9,检出限为17 pmol/L。据此建立了一个灵敏度高、选择性好、简便快速检测血红素的适配体修饰纳米金催化共振瑞利散射光谱法。

关键词: 血红素, 核酸适配体, 纳米金催化, 氧化亚铜微粒, 共振瑞利散射光谱法

Abstract: Hemin aptamer was used to modify gold nanoparticles (AuNPs) to obtain a stable aptamer-nanogold probe (AussDNA).In the condition of pH8.0 Tris-HCl buffer solution containing 50 mmol/L NaCl,the substrate chain of AussDNA was cracked by hemin to produce a short single-stranded DNA (ssDNA) and then further combine with hemin to form a stable hemin-ssDNA conjugate.The AuNPs released from AussDNA would be aggregated in the condition of 50 mmol/L NaCl and exhibited a strong resonance Rayleigh scattering (RRS) peak at 367.6 nm.Under the selected conditions,the increased RRS intensity (ΔI367.6 nm) was linear to hemin concentration in the range of 5~750 nmol/L,with a regression equation of ΔI367.6 nm=2.4C-144.4,coefficient of 0.982 9,and a detection limit of 66 pmol/L.This RRS method was applied to determination of residual hemin in serum samples,with satisfactory results.The remnant AussDNA in the solution exhibited a strong catalytic activity on the Cu2O particle reaction of Fehling reagent-glucose that can be monitored by RRS technique at 370 nm.When the hemin concentration increased,the AussDNA decreased,the catalysis decreased,and the RRS intensity at 370 nm decreased.The decreased RRS intensity ΔI370 nm was linear to the hemin concentration in the range of 0.25~200 nmol/L,with a regression equation of ΔI370 nm=5.5C+78,coefficient of 0.971 9,and a detection limit of 17 pmol/L.Accordingly,a sensitivity,selectivity,and simplicity new method of resonance Rayleigh scattering spectra to detect hemin using aptamer-modified nanogold as catalyst was established.

Key words: hemin, aptamer, nanogold catalysis, Cu2O particle, resonance Rayleigh scattering

中图分类号: 

  • O657.3
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