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Polyadenine-mediated Immobilization of Aptamers on a Gold Substrate for the Direct Detection of Bacterial Pathogens

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Abstract

Nucleic acid aptamers have been widely used as synthetic probes for bioanalytical applications. Herein, we carried out a detailed study on the immobilization of a series of aptamers ranging from 37 to 88 bases, which are specific to either Escherichia coli (E. coli) or Staphylococcus aureus (S. aureus), on a planar gold substrate via a polyadenine-mediated immobilization method. The resultant surfaces were characterized by both surface plasmon resonance spectroscopy (SPR) and X-ray photoelectron spectroscopy. The results clearly show that the aptamer solution at a lower ionic strength gives rise to a higher lateral density of the aptamer when compared to that at a higher ionic strength. The SPR aptasensors are then employed for detecting their corresponding bacteria (i.e., E. coli and S. aureus, respectively). The data indicate that the SPR aptasensor with a higher density of aptamer exhibits a better capture of target bacteria.

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Authors and Affiliations

  1. College of Chemical Engineering and Materials Science, Tianjin University of Science & Technology, No. 29, 13th Avenue, TEDA, Tianjin, 300457, China

    Wen-Wen Wang, Xiao Han & Li-Qiang Chu

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  1. Wen-Wen Wang
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  2. Xiao Han
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  3. Li-Qiang Chu
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Correspondence to Li-Qiang Chu.

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Wang, WW., Han, X. & Chu, LQ. Polyadenine-mediated Immobilization of Aptamers on a Gold Substrate for the Direct Detection of Bacterial Pathogens. ANAL. SCI. 35, 967–972 (2019). https://doi.org/10.2116/analsci.19P110

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  • DOI: https://doi.org/10.2116/analsci.19P110

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