A novel glucose biosensor based on phosphonic acid-functionalized silica nanoparticles for sensitive detection of glucose in real samples
作者： Wenbo Zhao , Yi Fang , Qinshu Zhu , Kuai Wang , Min Liu
DOI: 10.1016/J.ELECTACTA.2012.11.031
关键词:
摘要: Abstract An effective strategy for preparation amperometric biosensor by using the phosphonic acid-functionalized silica nanoparticles (PFSi NPs) as special modified materials is proposed. In such a strategy, glucose oxidase (GOD) was selected model protein to fabricate in presence of NPs). The PFSi NPs were first on surface glassy carbon (GC) electrode, then, GOD adsorbed onto film drop-coating. characterized transmission electron microscopy (TEM) and nuclear magnetic resonance (NMR) spectra. interaction with investigated circular dicroism spectroscopy (CD). results showed could essentially maintain native conformation GOD. direct transfer NPs)/GCE electrode exhibited excellent electrocatalytic activity oxidation glucose. proposed displayed fast response (5 s) glucose, good linear current–time relation over wide range concentrations from 5.00 × 10 −4 1.87 × 10 −1 M, low detection limit 2.44 × 10 −5 M ( S / N = 3). Moreover, can be used assessment concentration many real samples (relative error
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