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
中科院分区:
文献类型:
--
作者:
Squires AH;Hersey JS;Grinstaff MW;Meller A
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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