title: Sensitive and fast detection of fructose in complex media via symmetry breaking and signal amplification using surface-enhanced Raman spectroscopy.
abstract: A new strategy is proposed to sensitively and rapidly detect analytes with weak Raman signals in complex media using surface-enhanced Raman spectroscopy (SERS) via detecting the SERS signal changes of the immobilized probe molecules on SERS-active substrates upon binding of the analytes. In this work, 4-mercaptophenylboronic acid (4-MPBA) was selected as the probe molecule which was immobilized on the gold surface of a quasi-three-dimensional plasmonic nanostructure array (Q3D-PNA) SERS substrate to detect fructose. The molecule of 4-MPBA possesses three key functions: molecule recognition and reversible binding of the analyte via the boronic acid group, amplification of SERS signals by the phenyl group and thus shielding of the background noise of complex media, and immobilization on the surface of SERS-active substrates via the thiol group. Most importantly, the symmetry breaking of the 4-MPBA molecule upon fructose binding leads to the change of area ratio between totally symmetric 8a ring mode and nontotally symmetric 8b ring mode, which enables the detection. The detection curves were obtained in phosphate-buffered saline (PBS) and in undiluted artificial urine at clinically relevant concentrations, and the limit of detection of 0.05 mM was achieved.
authors: Department of Chemical Engineering, and ‡Department of Bioengineering, University of Washington , Seattle, Washington 98195, United States.
authors: Fang
authors: F
authors: Sun
authors: Tao
authors: T
authors: Bai
authors: Lei
authors: L
authors: Zhang
authors: Jean-Rene
authors: JR
authors: Ella-Menye
authors: Sijun
authors: S
authors: Liu
authors: Ann K
authors: AK
authors: Nowinski
authors: Shaoyi
authors: S
authors: Jiang
authors: Qiuming
authors: Q
authors: Yu
mesh_terms: D005632:Fructose / Q000032:analysis* / Q000652:urine; D006801:Humans; D057230:Limit of Detection; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties
chemical_list: D005632:Fructose