在Au(111) - 表面上,聚化诱导的寡核酸单层的潜在依赖性结构转变
Princia Salvatore1, Kasper K Karlsen, Allan G Hansen
1Department of Chemistry, Building 207, and Nano•DTU, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
Journal of the American Chemical Society
|October 27, 2012
概括
精子胺在黄金表面稳定双链DNA,产生独特的电化学信号. 这种通过循环电压测量检测到的信号可以识别DNA结构变化和不匹配.
科学领域:
- * 表面化学和电化学
- *纳米材料和生物传感器
- * 分子生物学和生物物理学
背景情况:
- *自组装单层 (SAM) 对于表面功能化至关重要.
- *电极表面的寡核酸 (ON) 是生物传感应用的关键.
- *精子胺 (Spd) 是一种与核酸相互作用的聚胺.
研究的目的:
- * 为了研究精子胺对Au上的寡核酸单层的作用.
- * 用精子胺来描述单链 (ss) 和双链 (ds) ON的电化学行为.
- * 确定DNA结构和不匹配的潜在电化学标记.
主要方法:
- * 化学合成3'-C3-SH结合的20个基寡核酸 (ss和ds).
- * 在Au(111) 电极上的固定.
- *使用循环电量计 (CV) 和现场扫描道显微镜 (STM) 进行电化学分析.
- * 化温度 (Tm) 的测量.
主要成果:
- * 精子胺的结合显著增加了d-ONs的化温度.
- *CV显示了ss-和ds-ONs的独特电容特征.
- * 在 -0.35 V 和 SCE 之间观察到强大的 ds-ON 特定电容峰值,对基数对不匹配敏感.
- * STM提供了在电化学控制下SAM的现场可视化.
结论:
- * 精子胺稳定了d-ONs在Au(111) 表面上的作用.
- *观察到的电化学峰值是d-DNA结构和完整性的敏感指标.
- *这种方法对开发用于DNA分析的电化学生物传感器具有前景.
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