Structure-switching aptamer triggering signal amplification strategy for tobramycin detection based on hybridization chain reaction and fluorescence synergism

Based on hybridization chain reaction (HCR) and fluorescence synergism, a novel aptasensor for tobramycin was successfully constructed. Tobramycin competed with cDNA-FAM to bind aptamers immobilized on magnetic beads. After magnetic separation, the released cDNA-FAM acted as initiator to trigger HCR...

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Veröffentlicht in:Talanta (Oxford) 2022-06, Vol.243, p.123318-123318, Article 123318
Hauptverfasser: Wang, Junyang, Li, Hongxia, Du, Caiyi, Li, Ying, Ma, Xinyue, Yang, Chuanyu, Xu, Wentao, Sun, Chunyan
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container_title Talanta (Oxford)
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creator Wang, Junyang
Li, Hongxia
Du, Caiyi
Li, Ying
Ma, Xinyue
Yang, Chuanyu
Xu, Wentao
Sun, Chunyan
description Based on hybridization chain reaction (HCR) and fluorescence synergism, a novel aptasensor for tobramycin was successfully constructed. Tobramycin competed with cDNA-FAM to bind aptamers immobilized on magnetic beads. After magnetic separation, the released cDNA-FAM acted as initiator to trigger HCR amplification, thus the fluorescence was significantly enhanced due to binding of SYBR Green Ⅰ (SGI) to the formed long double-stranded DNA and the synergistic fluorescence of FAM. In the absence of tobramycin, the initiator was magnetically separated and no HCR occurred, more importantly, graphene oxide can quench the fluorescence of excessive hairpins/SGI and cDNA-FAM, so almost no background signal was detected. This aptasensor can monitor tobramycin in the range of 0.3–50 μM with low detection limit of 17.37 nM. Due to the potential generality of structure-switching aptamers and effectiveness of fluorescence synergism, this enzyme-free amplification strategy can be extended to other applications by rational design of nucleic acid sequences. [Display omitted] •Structure-switching aptamer-based fluorescent assay for tobramycin detection.•Enzyme-free isothermal amplification was achieved by hybridization chain reaction.•Background fluorescence was reduced by magnetic separation and GO quenching effect.•SGI and FAM were used as signal probes to achieve fluorescence synergy.
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Tobramycin competed with cDNA-FAM to bind aptamers immobilized on magnetic beads. After magnetic separation, the released cDNA-FAM acted as initiator to trigger HCR amplification, thus the fluorescence was significantly enhanced due to binding of SYBR Green Ⅰ (SGI) to the formed long double-stranded DNA and the synergistic fluorescence of FAM. In the absence of tobramycin, the initiator was magnetically separated and no HCR occurred, more importantly, graphene oxide can quench the fluorescence of excessive hairpins/SGI and cDNA-FAM, so almost no background signal was detected. This aptasensor can monitor tobramycin in the range of 0.3–50 μM with low detection limit of 17.37 nM. Due to the potential generality of structure-switching aptamers and effectiveness of fluorescence synergism, this enzyme-free amplification strategy can be extended to other applications by rational design of nucleic acid sequences. 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subjects Aptamers, Nucleotide - genetics
Biosensing Techniques
DNA - genetics
Fluorescence synergism
Hybridization chain reaction
Limit of Detection
Nucleic Acid Hybridization
Signal amplification
Spectrometry, Fluorescence
Structure-switching aptamer
Tobramycin
title Structure-switching aptamer triggering signal amplification strategy for tobramycin detection based on hybridization chain reaction and fluorescence synergism
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