Ionic Signal Amplification of DNA in a Nanopore
Ionic Signal Amplification of DNA in a Nanopore
复制标题
纳米孔中 DNA 的离子信号放大
DOI:
10.1002/smtd.202200761
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发表时间:
2022
期刊:
影响因子:
12.4
通讯作者:
Kawai Tomoji
中科院分区:
文献类型:
--
作者:
Tsutsui Makusu;Yokota Kazumichi;He Yuhui;Kawai Tomoji
Ionic signal amplification is a key challenge for single‐molecule analyses by solid‐state nanopore sensing. Here, a permittivity gradient approach for amplifying ionic blockade characteristics of DNA in a nanofluidic channel is reported. The transmembrane ionic current response is found to change substantially through modifying the liquid permittivity at one side of a pore with an organic solvent. Imposing positive liquid permittivity gradients with respect to the direction of DNA electrophoresis, this study observes the resistive ionic signals to become larger due to the varying contributions of molecular counterions. On the contrary, negative gradients render adverse effects causing conductive ionic current pulses upon polynucleotide translocations. Most importantly, both the positive and negative gradients are demonstrated to be capable of amplifying the ionic signals by an order of magnitude with a 1.3‐fold difference in the transmembrane liquid dielectric constants. This phenomenon allows a novel way to enhance the single‐molecule sensitivity of nanopore sensing that may be useful in analyzing secondary structures and genome sequence of DNA by ionic current measurements.
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影响因子:
10.8
作者:
Fologea, D;Uplinger, J;Li, JL
通讯作者:
Li, JL
影响因子:
10.8
作者:
Wells DB;Belkin M;Comer J;Aksimentiev A
通讯作者:
Aksimentiev A
影响因子:
7.4
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通讯作者:
Yinghua Qiu;Z. Siwy;M. Wanunu
DOI:
10.1080/00268948608080131
发表时间:
1986
期刊:
影响因子:
--
作者:
E. Szwajczakaf;A. Szymański
通讯作者:
A. Szymański
影响因子:
10.8
作者:
Kowalczyk, Stefan W.;Dekker, Cees
通讯作者:
Dekker, Cees