title: Development of an oligopeptide functionalized surface plasmon resonance biosensor for online detection of glyphosate.
abstract: We report a surface plasmon resonance (SPR) biosensor for online detection of glyphosate. The surface of the sensing element is decorated with an oligopeptide, TPFDLRPSSDTR, which is identified by using phage display library. This oligopeptide shows high binding specificity for glyphosate (KD = 8.6 μM), probably because of the presence of R and D in the oligopeptide. To detect glyphosate in buffer solution, an SPR gold sensor chip is modified by using the oligopeptide with a surface density of 0.6 1/nm(2). The sensitivity of this oligopeptide-functionalized SPR biosensor is 1.02 RU/μM whereas the limit of detection (LOD) is 0.58 μM. This oligopeptide functionalized SPR biosensor also shows good specificity against other analytes such as glycine, thiacloprid, and imidacloprid.
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117576.
authors.forename: Xiaokang
authors.initials: X
authors.lastname: Ding
authors.forename: Kun-Lin
authors.initials: KL
authors.lastname: Yang
mesh_terms: D000595:Amino Acid Sequence; D015374:Biosensing Techniques / Q000379:methods*; D005998:Glycine / Q000031:analogs & derivatives* / Q000032:analysis / Q000235:genetics; D057230:Limit of Detection; D008969:Molecular Sequence Data; D009842:Oligopeptides / Q000737:chemistry* / Q000235:genetics; D020349:Surface Plasmon Resonance / Q000379:methods*; D000097797:Glyphosate
chemical_list: D005998:Glycine; D009842:Oligopeptides; D000097797:Glyphosate