title: A quantitative study of the intracellular dynamics of fluorescently labelled glyco-gold nanoparticles via fluorescence correlation spectroscopy.
abstract: The dynamic behaviour of gold nanoparticles functionalised with glucose (Glc-Au NPs) has been studied here by means of fluorescence correlation spectroscopy (FCS). Meaningful data on the state of aggregation and dynamics of Glc-Au NPs fluorescently-labelled with HiLyte Fluor647 (Glc-Au-Hi NPs) in the intracellular environment were obtained. Moreover, the work presented here shows that FCS can be used to visualise the presence of single NPs or NP aggregates following uptake and to estimate, locally, NP concentrations within the cell. FCS measurements become possible after applying a "prebleaching" methodology, when the immobile NP fraction has been effectively removed and thus significant FCS data has been recorded. In this study, Glc-Au-Hi NPs have been incubated with HepG2 cells and their diffusion time in the intracellular environment has been measured and compared with their diffusion value in water and cell media.
authors.affiliation: Biosurfaces Unit, Laboratory 1, CIC biomaGUNE, Paseo Miramón 182 C, San Sebastián, 20009, Spain.
authors.forename: Richard A
authors.initials: RA
authors.lastname: Murray
authors.forename: Yuan
authors.initials: Y
authors.lastname: Qiu
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Chiodo
authors.forename: Marco
authors.initials: M
authors.lastname: Marradi
authors.forename: Soledad
authors.initials: S
authors.lastname: Penadés
authors.forename: Sergio E
authors.initials: SE
authors.lastname: Moya
mesh_terms: D005456:Fluorescent Dyes / Q000737:chemistry*; D053768:Metal Nanoparticles; D046529:Microscopy, Electron, Transmission; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D005456:Fluorescent Dyes
keywords: diffusion; fluorescence correlation spectroscopy; gold nanoparticles; intracellular concentration; intracellular dynamics