title: A highly sensitive and selective fluorescent Cu2+ sensor synthesized with silica nanoparticles.
abstract: A novel fluorescent nanosensor for the determination of Cu(2+) was synthesized with N-(quinoline-8-yl)-2-(3-triethoxysilyl-propylamino)-acetamide (QlOEt) grafted onto the surface of silica nanoparticles (SiNPs) using the reverse microemulsion method. Spherical SiNPs were used as substrate and QlOEt was used simultaneously as the binding and readout system for Cu(2+). This sensor has been realized as a highly sensitive and selective technique for the detection and quantification of trace amounts of Cu(2+). The probe exhibits a dynamic response range for Cu(2+) from 2.0 x 10(-6) to 2.0 x 10(-5) M, with a detection limit of 3.8 x 10(-7) M. Other alkali, alkaline earth, and transitional metal ions including Li(+), K(+), Mg(2+), Ca(2+), Sr(2+), Mn(2+), Zn(2+), Mo(6+), Pb(2+), Ag(+) had no significant interference on Cu(2+) determination. Poisonous and flammable reagents are avoided during the synthesis of this nanosensor. Therefore the strategy explored in this work can be extended to the synthesis of other chemo- and biosensors for direct detection of specific targets in an intracellular environment.
authors.affiliation: School of Chemistry, Jilin University, Changchun, People's Republic of China.
authors.forename: Jiannan
authors.initials: J
authors.lastname: Zheng
authors.forename: Chuan
authors.initials: C
authors.lastname: Xiao
authors.forename: Qiang
authors.initials: Q
authors.lastname: Fei
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Baojun
authors.initials: B
authors.lastname: Wang
authors.forename: Guodong
authors.initials: G
authors.lastname: Feng
authors.forename: Hongmei
authors.initials: H
authors.lastname: Yu
authors.forename: Yanfu
authors.initials: Y
authors.lastname: Huan
authors.forename: Zhiguang
authors.initials: Z
authors.lastname: Song
mesh_terms: D000081:Acetamides / Q000737:chemistry; D015374:Biosensing Techniques / Q000379:methods*; D002413:Cations, Divalent / Q000032:analysis / Q000737:chemistry; D003300:Copper / Q000032:analysis* / Q000737:chemistry; D016014:Linear Models; D008670:Metals / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D012680:Sensitivity and Specificity; D012822:Silicon Dioxide / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D000081:Acetamides; D002413:Cations, Divalent; D008670:Metals; D012822:Silicon Dioxide; D003300:Copper