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单链DNA与曲碳纳米管的相互作用要比与平面石墨的相互作用强得多
Sara Iliafar1, Jeetain Mittal, Dmitri Vezenov
1Department of Chemical and Biomolecular Engineering and ‡Bioengineering Program, Lehigh University , Bethlehem, Pennsylvania 18015, United States.
Journal of the American Chemical Society
|August 28, 2014
概括
单链DNA (ssDNA) 与曲的单壁碳纳米管 (SWCNTs) 相比,与平面相比更强烈地结合. 这种增强的结合,用自由能量量化,归因于SWCNTs上的ssDNA自发曲线.
科学领域:
- 材料科学 材料科学 材料科学
- 生物物理学的生物物理.
- 纳米技术 纳米技术
背景情况:
- 了解核酸和碳纳米材料之间的相互作用对于开发先进的生物传感器和药物输送系统至关重要.
- 单壁碳纳米管 (SWCNTs) 为纳米级应用提供独特的电子和机械性能.
- 自组装单层 (SAM) 为表面功能化和控制分子相互作用提供了一个多功能平台.
研究的目的:
- 量化单链DNA (ssDNA) 同聚合物的与SWCNTs的结合强度.
- 为了比较ssDNA与SWCNT与平面石墨表面的结合亲和力.
- 阐明SWCNT曲率在ssDNA结合相互作用中的作用.
主要方法:
- 单分子力光谱法 (SMFS) 用于测量ssDNA同聚合物脱离所需的力.
- 用一个简单的平衡模型来计算每个核酸结合的自由能量.
- 进行了复制品交换分子动力学 (REMD) 模拟,以研究在原子层面上的ssDNA-SWCNT相互作用.
主要成果:
- 与SAMS结合相比,与SWCNT结合的ssDNA表现出明显更高的自由能量.
- 结合亲和力遵循了SWCNTs的poly (A) > poly (G) > poly (T) > poly (C) 顺序.
- ssDNA与曲SWCNTs的结合意外地比平面石墨更强,具有不同的序列偏好.
结论:
- ssDNA的自发曲线在其加强与SWCNTs的结合中起着关键作用.
- 与石墨等平面相比,SWCNT对ssDNA具有明显更强的结合平台.
- 这些发现对基于DNA的纳米设备的设计和理解DNA-纳米材料相互作用有影响.
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