Bio-dots assembly-induced aggregation of gold nanoparticles for highly sensitive and selective colorimetric detection of methionine

被引：26

作者：

Kuang, Lan ^{[1
,2
]}

Zhang, Li ^{[1
,2
]}

Xu, Ai-Zhen ^{[1
,2
]}

Li, Zhi-Mei ^{[1
,2
]}

Liang, Ru-Ping ^{[1
,2
]}

Qiu, Jian-Ding ^{[1
,2
,3
]}

机构：

[1] Nanchang Univ, Coll Chem, Nanchang 330031, Jiangxi, Peoples R China

[2] Nanchang Univ, Inst Adv Study, Nanchang 330031, Jiangxi, Peoples R China

[3] Pingxiang Univ, Dept Mat & Chem Engn, Pingxiang 337055, Peoples R China

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2017年 / 244卷

基金：

中国国家自然科学基金;

关键词：

Bio-dots; Gold nanoparticles; Methionine; Colorimetric detection; AMINO-ACIDS; FLUORESCENT-PROBE; CYSTEINE; HOMOCYSTEINE; QUANTITATION; BIOTHIOLS; DNA; COMPLEX; ASSAY;

D O I：

10.1016/j.snb.2017.01.094

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Methionine (Met) is one of sulfur-containing essential amino acids, it plays an indispensable role in physiological processes. Its quantitative and sensitive determination is imperative. However, currently available analytical approaches for determination of Met are scarce and also exhibit many disadvantages, such as poor selectivity for Met towards other amino acids and biothiols. In this work, a label-free colorimetric biosensor based on bio-dots assembly-triggered aggregation of gold nanoparticles (AuNPs) for detecting Met is firstly developed. In the presence of Met, Met effectively prevents the bio-dots assembly-induced aggregation of AuNPs since that AuNPs are protected inside the Met layer. This colorimetric biosensor provides a simple, fast, highly sensitive and highly selective method for Met detection. It presents lower detection limit of 3.2 nM and exhibits highly selectivity toward bio-thiols surprisingly. Furthermore, this proposed biosensor has been successfully applied for the determination of Met in human serum. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：1031 / 1036

页数：6

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