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• W2807871219 endingPage "187" @default.
• W2807871219 startingPage "180" @default.
• W2807871219 abstract "Aptamers could be used to construct simple and effective biosensor because the conformational switch of aptamer upon target binding is easy to be transferred to optical or electrochemical signals. Nevertheless, we found that the binding between saxitoxin (STX) and aptamer (M-30f) is not accompanied with conformational switch. Here, the circular dichroism spectra, fluorophore and quencher labeled aptamer, and crystal violet-based assays were used to identify the binding way between STX and aptamer. The results show that the conformation of aptamer is stabilized in PBS buffer (10 mM phosphate buffer, 2.7 mM KCl, 137 mM NaCl, pH 7.4) and this conformation may provide an exactly suitable cave for STX binding. Through the analysis of UV-melting curves and circular dichroism-melting curves, it is found that different concentrations of STX produce different unfolding extents of the aptamer under high temperature. Then, a simple temperature-assisted “turn-on” fluorescent aptasensor was developed to detect STX and the application in real sample detection demonstrates its feasibility. The proposed method provides not only an alternative for STX detection but also a strategy for simple aptasensor design using aptamers that do not switch conformation upon targets binding." @default.
• W2807871219 created "2018-06-21" @default.
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• W2807871219 date "2018-11-01" @default.
• W2807871219 modified "2023-10-16" @default.
• W2807871219 title "Study of the binding way between saxitoxin and its aptamer and a fluorescent aptasensor for detection of saxitoxin" @default.
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• W2807871219 doi "https://doi.org/10.1016/j.saa.2018.06.036" @default.
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• W2807871219 hasPublicationYear "2018" @default.
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