title: Simple nanoparticle-based luminometric method for molecular weight determination of polymeric compounds.
abstract: A nanoparticle-based method utilizing time-resolved luminescence resonance energy transfer (TR-LRET) was developed for molecular weight determination. This mix-and-measure nanoparticle method is based on the competitive adsorption between the analyte and the acceptor-labeled protein to donor Eu(III) nanoparticles. The size-dependent adsorption of molecules enables the molecular weight determination of differently sized polymeric compounds down to a concentration level of micrograms per liter. The molecular weight determination from 1 to 10 kDa for polyamino acids and from 0.3 to 70 kDa for polyethylene imines is demonstrated. The simple and cost-effective nanoparticle method as microtiter plate assay format shows great potential for the detection of the changes in molecular weight or for quantification of differently sized molecules in biochemical laboratories and in industrial polymeric processes.
authors: Laboratory of Biophysics and Medicity Research Laboratory, University of Turku , Tykistökatu 6A, 20520 Turku, Finland.
authors: Sari
authors: S
authors: Pihlasalo
authors: Maria
authors: M
authors: Virtamo
authors: Nicolas
authors: N
authors: Legrand
authors: Pekka
authors: P
authors: Hänninen
authors: Harri
authors: H
authors: Härmä
mesh_terms: D000327:Adsorption; D000818:Animals; D001667:Binding, Competitive; D002232:Carbocyanines; D005063:Europium; D031541:Fluorescence Resonance Energy Transfer; D005456:Fluorescent Dyes; D006801:Humans; D008163:Luminescent Measurements / Q000379:methods*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008970:Molecular Weight; D009842:Oligopeptides / Q000032:analysis*; D011094:Polyethyleneimine / Q000032:analysis*; D005719:gamma-Globulins / Q000032:analysis*
chemical_list: D002232:Carbocyanines; D005456:Fluorescent Dyes; D009842:Oligopeptides; D005719:gamma-Globulins; D005063:Europium; D011094:Polyethyleneimine