Aptamer‐Assisted Gold Nanoparticles/PEDOT Platform for Ultrasensitive Detection of LPS |
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Authors: | Wenqiong Su MiSuk Cho Jae‐Do Nam Woo‐Seok Choe Youngkwan Lee |
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Institution: | 1. School of Chemical Engineering, Sungkyunkwan University, Suwon 440‐746, Republic of Korea;2. Department of Polymer Science and Engineering, Sungkyunkwan University, Suwon 440‐746, Republic of Korea |
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Abstract: | Neatly arranged gold nanoparticles (AuNPs) were directly electrodeposited on an electrochemically polymerized self‐assembled monolayer (SAM) of thiol‐functionalized 3,4‐ethylenedioxythiophene (EDOT) derivative, EDTMSHA. A thiolated single‐stranded DNA (ssDNA) aptamer with high specificity to LPS was immobilized on the AuNPs/conducting polymer composite film, serving as sensing platform for LPS detection. Electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), scanning electron microscope (SEM), and atomic force microscopy (AFM) were utilized to characterize the modification and detection processes. The electron transfer resistance was found to have a linear relationship with LPS concentration from 0.1 pg/mL to 1 ng/mL. |
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Keywords: | Conducting polymer Gold nanoparticles LPS ssDNA aptamers PEDOT EDTMSHA |
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