title: Green preparation of carbon dots with papaya as carbon source for effective fluorescent sensing of Iron (III) and Escherichia coli.
abstract: A simple one-step hydrothermal green approach was reported for the preparation of carbon dots (CDs) without any further decoration or modification with papaya powder as natural carbon source. In this economical and eco-friendly system, deionized water or 90% ethanol was used as solvent to produce water-soluble or ethanol-soluble CDs, respectively, termed as W-CDs and E-CDs. The quantum yield (QY) for W-CDs was 18.98%, while that for E-CDs was 18.39%. The potentials of the prepared carbon dots toward diverse applications were thoroughly investigated. W-CDs and E-CDs provide promising probes for fluorescence detection of Fe(3+), offering limits of detection of 0.48μmolL(-1) and 0.29μmolL(-1), respectively. W-CDs was further demonstrated to be a promising probe for fluorescence sensing of Escherichia coli O157: H7, along with a limit of detection of 9.5×10(4)cfumL(-1). Meanwhile, both W-CDs and E-CDs exhibit favorable biocompatibility, and demonstrated to be efficient for Hela cell imaging.
authors.affiliation: Research Center for Analytical Sciences, College of Sciences, Northeastern University, 110819, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
authors.affiliation: Research Center for Analytical Sciences, College of Sciences, Northeastern University, 110819, China.
authors.forename: Yiting
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Research Center for Analytical Sciences, College of Sciences, Northeastern University, 110819, China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Guo
authors.affiliation: Research Center for Analytical Sciences, College of Sciences, Northeastern University, 110819, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Yang
authors.affiliation: Research Center for Analytical Sciences, College of Sciences, Northeastern University, 110819, China. Electronic address: chenml@mail.neu.edu.cn.
authors.forename: Mingli
authors.initials: M
authors.lastname: Chen
authors.affiliation: Research Center for Analytical Sciences, College of Sciences, Northeastern University, 110819, China. Electronic address: jianhuajrz@mail.neu.edu.cn.
authors.forename: Jianhua
authors.initials: J
authors.lastname: Wang
mesh_terms: D015374:Biosensing Techniques / Q000379:methods; D029441:Carica / Q000737:chemistry*; D004926:Escherichia coli / Q000302:isolation & purification*; D004927:Escherichia coli Infections / Q000382:microbiology; D005456:Fluorescent Dyes / Q000737:chemistry*; D055772:Green Chemistry Technology / Q000379:methods*; D006367:HeLa Cells; D006801:Humans; D007501:Iron / Q000032:analysis*; D061848:Optical Imaging / Q000379:methods; D045663:Quantum Dots / Q000737:chemistry* / Q000648:ultrastructure; D012995:Solubility; D013050:Spectrometry, Fluorescence / Q000379:methods; D014867:Water / Q000737:chemistry
chemical_list: D005456:Fluorescent Dyes; D014867:Water; D007501:Iron
keywords: Carbon dots; Cell imaging; E. coli sensor; Florescence; Green preparation; Iron