Development of an Oligopeptide Functionalized Surface Plasmon Resonance Biosensor for Online Detection of Glyphosate

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• 作者：Xiaokang Ding ; Kun-Lin Yang
• 刊名：Analytical Chemistry
• 出版年：2013
• 出版时间：June 18, 2013
• 年：2013
• 卷：85
• 期：12
• 页码：5727-5733
• 全文大小：352K
• 年卷期：v.85,no.12(June 18, 2013)
• ISSN：1520-6882

文摘

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 (K_D = 8.6 渭M), 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/nm². The sensitivity of this oligopeptide-functionalized SPR biosensor is 1.02 RU/渭M whereas the limit of detection (LOD) is 0.58 渭M. This oligopeptide functionalized SPR biosensor also shows good specificity against other analytes such as glycine, thiacloprid, and imidacloprid.