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Nanoparticle‐Assisted Affinity NMR Spectroscopy: High Sensitivity Detection and Identification of Organic Molecules
Author(s) -
DiezCastellnou Marta,
Salvia MarieVirginie,
Springhetti Sara,
Rastrelli Federico,
Mancin Fabrizio
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201603578
Subject(s) - chemistry , nanoparticle , selectivity , monolayer , diffusion , molecule , analyte , analytical chemistry (journal) , nuclear magnetic resonance spectroscopy , detection limit , combinatorial chemistry , materials science , chromatography , organic chemistry , nanotechnology , physics , biochemistry , thermodynamics , catalysis
A simple and effective method for high‐sensitivity NMR detection of selected compounds is reported. The method combines 1D NMR diffusion filter experiments and small monolayer‐protected nanoparticles as high‐affinity receptors. Once bound to the nanoparticles, the diffusion coefficient of the analyte decreases in such way that spectral editing based on diffusion filters can separate its signals from those of other mixture components. Using nanoparticles functionalized with Zn 2+ ‐triazacyclonane complexes, detection and identification of phosphorylated organic molecules can be achieved. Diphenyl phosphate can be detected at 25 micromolar concentration with good selectivity. The selectivity toward organic carboxylates is enhanced at pD=3.75. In these conditions, commercial tablets containing betamethasone phosphate and a large excess of benzoate could be successfully analyzed.