A nanopore-nanofiber mesh biosensor to control DNA translocation.

A nanopore-nanofiber mesh biosensor to control DNA translocation.
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DOI:
10.1021/ja408685x
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发表时间:
2013-11-06
影响因子:
15
通讯作者:
Meller A
Meller A
中科院分区:
化学1区
文献类型:
--
作者:
Squires AH;Hersey JS;Grinstaff MW;Meller A

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固态纳米孔在生物医学应用中显示出作为单分子传感器的前景,但要提高它们的分辨率和效率,分析物分子必须在纳米孔传感体积中停留更长时间。在这里,我们展示了一种新颖、方便和可定制的纳米孔传感器改进,通过纳米孔外的相互作用将双链DNA转位速度降低两个数量级或更多。这是通过将共聚纳米纤维网(NFM)直接静电纺丝到固态纳米孔(NP)芯片上来实现的。使用一组不同目次组成的NFMS来强调NFMS对通过纳米孔的dsDNA转位的影响,这些NFMS将相对于裸孔的转位速度从1倍降低到>100倍。这套具有代表性的NFM对DNA有效,只要20kBP,提高纳米孔分辨率,并允许区分不同长度的DNA。
Solid-state nanopores show promise as single-molecule sensors for biomedical applications, but to increase their resolution and efficiency analyte molecules must remain longer in the nanopore sensing volume. Here we demonstrate a novel, facile, and customizable nanopore sensor modification that reduces double stranded DNA translocation velocity by two orders of magnitude or more via interactions outside the nanopore. This is achieved by electrospinning a copolymer nanofiber mesh (NFM) directly onto a solid-state nanopore (NP) chip. The effect of NFMs on dsDNA translocation through a nanopore is highlighted using a set of NFMs of varying mesh composition that reduce translocation speed relative to a bare pore from 1× to >100×. A representative NFM from this set is effective on DNA as long as 20 kbp, improves nanopore resolution, and allows discrimination among different DNA lengths.
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