Abstract
A novel enzyme-linked aptamer assay (ELAA) with the aid of Exonuclease I (Exo I) for colorimetric detection of small molecules was developed. The fluorescein isothiocyanate (FITC)-labeled aptamer was integrated into a double-stranded DNA (dsDNA). In the presence of target, the binding of aptamer with target protected the aptamer from Exo I degradation, which resulted in the FITC tag remaining on the aptamer. Then, the anti-FITC-HRP conjugate was used to produce an optically observable signal. By monitoring the color change, we were able to detect two model molecules, ATP and L-argininamide, with high selectivity and high sensitivity even in the serum matrix. It is expected to be a simple and general ELAA method with wide applicability.
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Acknowledgments
This work was supported by National Basic Research Program of China (2011C91101, 2013CB933701), NSFC (no. 21127901, 21121063), and Chinese Academy of Sciences.
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Zhao, Q., Zhang, Z., Xu, L. et al. Exonuclease I aided enzyme-linked aptamer assay for small-molecule detection. Anal Bioanal Chem 406, 2949–2955 (2014). https://doi.org/10.1007/s00216-014-7705-z
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DOI: https://doi.org/10.1007/s00216-014-7705-z