title: "Molecular beacon"-hosted thioflavin T: Applications for label-free fluorescent detection of iodide and logic operations.
abstract: In this work, we presented a simple, label-free and rapid-responsive fluorescence assay for iodide (I(-)) detection based on "molecular beacon (MB)"-hosted thioflavin T (ThT), achieving a limit of detection as low as 158 nM. The proposed method exhibited very good selectivity to I(-) ions over other anions interference due to the strong binding force between I(-) ions with Hg(2+). Upon the addition of I(-) ions, it would capture Hg(2+) from a T-Hg(2+)-T complex belonging to the MB-like DNA hairpin structure, which eventually quenched the initial fluorescence as output. In addition, it was successfully applied for operation of an integrated DNA logic gate system and to the determination of I(-) in real samples such as human urine.
authors.affiliation: Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China.
authors.forename: Yan-Yun
authors.initials: YY
authors.lastname: Li
authors.affiliation: School of Life Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China.
authors.forename: Xiao-Qin
authors.initials: XQ
authors.lastname: Jiang
authors.affiliation: Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China.
authors.forename: Ling-Fei
authors.initials: LF
authors.lastname: Lu
authors.affiliation: Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China. Electronic address: mzhang@chem.ecnu.edu.cn.
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China.
authors.forename: Guoyue
authors.initials: G
authors.lastname: Shi
mesh_terms: D052160:Benzothiazoles; D015374:Biosensing Techniques / Q000379:methods*; D004247:DNA / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D006801:Humans; D007454:Iodides / Q000652:urine*; D008628:Mercury / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013844:Thiazoles / Q000737:chemistry*
chemical_list: D052160:Benzothiazoles; D005456:Fluorescent Dyes; D007454:Iodides; D013844:Thiazoles; C009462:thioflavin T; D004247:DNA; D008628:Mercury
keywords: DNA; Iodide; Logic gate; Molecular beacon; Thioflavin T