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题名: Ratiometric Fluorescent Biosensing of Hydrogen Peroxide and Hydroxyl Radical in Living Cells with Lysozyme-Silver Nanoclusters: Lysozyme as Stabilizing Ligand and Fluorescence Signal Unit
作者: Liu, Fang1; Bing, Tao2; Shangguan, Dihua2; Zhao, Meiping3; Shao, Na1
刊名: ANALYTICAL CHEMISTRY
发表日期: 2016-11-01
卷: 88, 期:21, 页:10631-10638
收录类别: SCI
英文摘要: Construction of facile ratiometric fluorescent probes which possess sensitive and selective sensing ability for bioactive small molecules is highly desirable and challenging. Herein, silver nanoclusters capped with denatured lysozyme (dLys-AgNCs) were synthesized and proved to be dual emissive. The facility of the dLys-AgNCs ratiometric probe was attributed to the finding that the lysozyme acted not only as stabilizing ligand but also as fluorescence signal unit. In the presence of Fenton reagents, the emission of dLys-AgNCs at 640 nm was quenched by center dot OH, whereas the emission at 450 was enhanced due to center dot OH-induced oxidation of tyrosine in the lysozyme. This probe could be used for highly sensitive detection of H2O2. The fluorescence changes of F450/F640 had fantastic linearity to H2O2 concentrations in the range of 0.8-200 mu mol/L (R2 = 0.9993), with a limit of detection (LOD) as low as 0.2 mu mol/L. Additionally, this probe was also applied to H2O2-generated oxidase-based biosensing. As a proof-of-concept, glucose and acetylcholine chloride were detected with benefical LOD values of 0.6 mu mol/L and 0.8 mu mol/L, respectively. Furthermore, fluorescence confocal imaging demonstrated dLys-AgNCs had a sensitive response to fluctuation of center dot OH levels in living cells, which might have promising application in study of center dot OH-induced oxidative damage to proteins.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35690
Appears in Collections:活体分析化学实验室_期刊论文

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作者单位: 1.Beijing Normal Univ, Coll Chem, Beijing 100875, Peoples R China
2.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Key Lab Analyt Chem Living Biosyst, Inst Chem, Beijing 100190, Peoples R China
3.Peking Univ, Beijing Natl Lab Mol Sci, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
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