个人信息Personal Information
教授
博士生导师
硕士生导师
主要任职:化学学院副院长
其他任职:辽宁省教学名师,宝钢优秀教师特等奖提名奖,中国分析测试学会青年学术委员会委员
性别:女
毕业院校:南京大学
学位:博士
所在单位:化学学院
学科:分析化学. 生物化学与分子生物学
办公地点:化工综合楼C305
电子邮箱:wushuo@dlut.edu.cn
An ATMND/SGI based label-free and fluorescence ratiometric aptasensor for rapid and highly sensitive detection of cocaine in biofluids
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论文类型:期刊论文
发表时间:2016-12-01
发表刊物:TALANTA
收录刊物:SCIE、EI、PubMed、Scopus
卷号:161
页面范围:437-442
ISSN号:0039-9140
关键字:Aptasensor; Label-free; Ratiometric; Cocaine; Biofluids
摘要:A label-free ratiometric fluorescence aptasensor has been developed for the rapid and sensitive detection of cocaine in complex biofluids. The fluorescent aptasensor is composed of a non-labeled GC-38 cocaine aptamer which serves as a basic sensing unit and two fluorophores, 2-amino-5,6,7-trimethyl-1,8-naphthyridine (ATMND) and SYBR Green I (SGI) which serves as a signal reporter and a build-in reference, respectively. The detection principle is based on a specific cocaine mediated ATMND displacement reaction and the corresponding change in the fluorescence ratio of ATMND to SGI. Due to the high affinity of the non-labeled aptamer, the good precision originated from the ratiometric method, and the good fluorescence quantum yield of the fluorophore, the aptasensor shows good analytical performance with respect to cocaine detection. Under optimal conditions, the aptasensor shows a linear range of 0.10-10 mu M and a low limit of detection of 56 nM, with a fast response of 20 s. The low limit of detection is comparable to most of the fluorescent aptasensors with signal amplification strategies and much lower than all of the unamplified cocaine aptasensors. Practical sample analysis in a series of complex biofluids, including urine, saliva and serum, also indicates the good precision, stability, and high sensitivity of the aptasensor, which may have great potential for the point-of-care screening of cocaine in complex biofluids. (C) 2016 Elsevier B.V. All rights reserved.