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Dispersion quality of single-walled carbon nanotubes reveals the recognition sequence of DNA

机译：单壁碳纳米管的分散质量揭示了DNA的识别序列

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摘要

The specific recognition between DNA and single-walled carbon nanotubes (SWCNTs) has enabled wide applications, especially in the chiral sorting of SWCNTs. However, the molecular recognition mechanism has not been fully understood. In our work, various DNA-SWCNT dispersions were prepared by the ultrasonic dispersion method, and characterized by UV absorption spectroscopy, fluorescence emission spectroscopy, zeta potential measurement, SDBS exchange kinetics and computer simulation. The effect of DNA sequence on the structure and properties of hybrid molecules was analyzed. Data analysis showed that DNA with specific recognition had better dispersion quality of the corresponding SWCNT, which means that higher content of monodispersed SWCNTs was obtained. The high-quality dispersion of the DNA-SWCNT pair was attributed to the stronger binding between DNA and SWCNT, resulting in a tighter conformation of DNA on the SWCNT surface and a larger zeta potential of DNA-SWCNT hybrids. Consequently, DNA-SWCNT dispersions of the recognition pair exhibited better stability against salt and stronger fluorescence emission intensity. However, the correlation between specific recognition and DNA coverage on SWCNT was not observed. This work gives more insight into the recognition mechanism between DNA and SWCNTs.
机译：DNA和单壁碳纳米管（SWCNT）之间的具体识别使得具有广泛的应用，尤其是在SWCNT的手性分选中。然而，分子识别机制尚未得到完全理解。在我们的工作中，通过超声波分散方法制备各种DNA-SWCNT分散体，并通过UV吸收光谱，荧光发射光谱，Zeta电位测量，SDBS交换动力学和计算机模拟。分析了DNA序列对杂化分子结构和性质的影响。数据分析表明，具有特异性识别的DNA具有更好的相应SWCNT的分散质量，这意味着获得了更高的单分散SWCNT的含量。 DNA-SWCNT对的高质量分散归因于DNA和SWCNT之间的较强结合，导致DNA对SWCNT表面的更严格构象和DNA-SWCNT杂种的较大Zeta电位。因此，识别对的DNA-SWCNT分散体表现出更好的抗盐和更强的荧光发射强度稳定性。然而，未观察到对SWCNT的特定识别和DNA覆盖之间的相关性。这项工作更有了解DNA和SWCNT之间的识别机制。

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