Ag+-Gated Surface Chemistry of Gold Nanoparticles and Colorimetric Detection of Acetylcholinesterase

被引：59
作者：
Zhang, Jiangjiang [1 ,2 ,3 ]
Zheng, Wenshu [1 ,2 ,3 ]
Jiang, Xingyu [1 ,2 ,3 ]
机构：
[1] Beijing Engn Res Ctr BioNanotechnol, 11 Zhongguancun Beiyitiao, Beijing 100190, Peoples R China
[2] Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, CAS Key Lab Biomed Effects Nanomat & Nanosafety, 11 Zhongguancun Beiyitiao, Beijing 100190, Peoples R China
[3] Univ Chinese Acad Sci, Sinodanish Coll, Beijing 100049, Peoples R China
来源：
SMALL | 2018年 / 14卷 / 31期
基金：
美国国家科学基金会;
关键词：
acetylcholinesterase detection; gold nanoparticles; peroxidase activity; surface chemistry; PEROXIDASE-LIKE ACTIVITY; ENZYME-LIKE ACTIVITY; CHOLINESTERASE ACTIVITY; COORDINATION POLYMERS; FLUORESCENT DETECTION; ARTIFICIAL ENZYMES; CATALYTIC-ACTIVITY; GLUCOSE DETECTION; GRAPHENE OXIDE; ASSAY;
D O I：
10.1002/smll.201801680
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Chemical regulation of enzyme-mimic activity of nanomaterials is challenging because it requires a precise understanding of the surface chemistry and mechanism, and rationally designed applications. Herein, Ag+-gated peroxidase activity is demonstrated by successfully modulating surface chemistry of cetyltrimethylammonium bromide-capped gold nanoparticles (CTAB-AuNPs). A surface blocking effect of long-chain molecules on surfaces of AuNPs that inhibit peroxidase activity of AuNPs is found. Ag+ ions can selectively bind on the surfaces of AuNPs and competitively destroy CTAB membrane forming Ag+@CTAB-AuNPs complexes to result in enhanced peroxidase activity. Ag+@CTAB-AuNPs show the highest peroxidase activity compared to similar-sized citrate-capped and ascorbic acid-capped AuNPs. Ag+@CTAB-AuNPs can potentially develop into analyte-responsive systems and exhibit advantages in the optical sensing field. For example, the Ag+@CTAB-AuNPs system shows an enhanced sensitivity and selectivity for acetylcholinesterase activity sensing compared to other methods.
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页数：8
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