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arXiv 2303.03563cond-mat.soft
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通过感应磁场传感易位聚合物

Sensing Translocating Polymers via Induced Magnetic Fields

Sahin Buyukdagli

AI总结:

本研究基于电荷输运理论,分析电压/压力驱动下DNA易位膜纳米孔的感应磁场信号特征,发现其信号处于纳特斯拉量级可被现有传感器检测,为低噪声生物测序提供新传感思路。

摘要:

提高基于纳米孔的生物测序设备分辨率的需求,要求整合对背景噪声敏感度更低的新型生物传感技术。本文中,我们探究了穿过膜纳米孔的离子电流所感应的磁场中,聚合物易位的特征信号。在先前提出的电荷输运理论框架内,我们评估了单价盐溶液中由电压和压力驱动的DNA易位事件产生的磁场信号。我们的理论体系表明,在电压驱动的输运中,易位聚合物通过空间位阻阻塞纳米孔中部的离子电流,从而抑制感应磁场。在压力驱动输运的情况下,易位导致的磁场减弱源于阴离子型DNA表面电荷对主要由盐阳离子构成的流动电流的负电动贡献。相应磁场信号的幅度处于纳特斯拉范围,而磁电传感器的分辨率可覆盖该范围,这类传感器能检测低至皮特斯拉范围的磁场。这表明,将磁场检测技术整合到当前的生物测序方法中,可有效补充传统的采用离子电流读出的生物传感策略——传统策略对背景噪声的敏感度很高。

英文摘要:

The requirement to boost the resolution of nanopore-based biosequencing devices necessitates the integration of novel biosensing techniques with reduced sensitivity to background noise. In this article, we probe the signatures of translocating polymers in magnetic fields induced by ionic currents through membrane nanopores. Within the framework of a previously introduced charge transport theory, we evaluate the magnetic field signals generated by voltage- and pressure-driven DNA translocation events in monovalent salt solutions. Our formalism reveals that in voltage-driven transport, the translocating polymer suppresses the induced magnetic field via the steric blockage of the ion current through the mid-pore. In the case of pressure-driven transport, the magnetic field reduction by translocation originates from the negative electrokinetic contribution of the anionic DNA surface charges to the streaming current predominantly composed of salt cations. The magnitude of the corresponding field signals is located in the nano-Tesla range covered by the resolution of the magnetoelectric sensors able to detect magnetic fields down to the pico-Tesla range. This suggests that the integration of magnetic field detection techniques into the current biosequencing approaches can complement efficiently the conventional biosensing strategies employing ionic current readouts with high susceptibility to background noise.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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