Abstract:
:Based on the specific interaction of Ag+ and cytosine-cytosine (C-C) base mismatch and using berberine (Ber) as the fluorescent probe and Exonuclease I (Exo I) as the background fluorescence reducing tool, a label-free Exo I-assisted fluorescence aptamer sensing platform was established for the detection of silver ions with high sensitivity and selectivity. Exo I reduced the fluorescence background of the Ber/Ag+-aptamer complex to a level similar to that of Ber itself in the absence of Ag+. After introducing Ag+ into the sensing system, it induces the aptamer rich in base C to form C-Ag+-C i-motif structure which are resistant to degradation mediated by Exo I. The concentration of Ber, Ag+-aptamer, Exo I and the temperature and reaction time for Exo I were all optimized. Under the optimal experimental conditions, the detection limit of Ag+ was 4.4 nM and the linear range was from 0.0059 μM to 235.48 μM with a coefficient of determination (R2) > 0.99. Moreover, the proposed strategy had been successfully applied to the detection of Ag+ in tap water and human serum with a good recovery ranging from 88.4% to 106.9%.
journal_name
Spectrochim Acta A Mol Biomol Spectroscauthors
Wei Z,Lan Y,Zhang C,Jia J,Niu W,Wei Y,Fu S,Yun Kdoi
10.1016/j.saa.2021.119927keywords:
["Ag(+)","C-Ag(+)-C","Exonuclease I","Fluorescence aptasensor","Label-free"]subject
Has Abstractpub_date
2021-11-05 00:00:00pages
119927eissn
1386-1425issn
1873-3557pii
S1386-1425(21)00504-7journal_volume
260pub_type
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