在表面增强的拉曼光谱中实现结构类型的分子识别:诱导电荷和几何互补性以模仿分子对接
Shi Xuan Leong1, Ya-Chuan Kao1, Xuemei Han1
1Division of Chemistry and Biological Chemistry, School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.
Angewandte Chemie (International ed. in English)
|September 7, 2023
概括
这项研究引入了一种新的表面增强拉曼散射 (SERS) 方法,用于区分复杂的生物分子. 通过利用电荷和几何相补性,它可以实现高特异性来识别异构结构,如二硫酸盐 (CS).
科学领域:
- 分析化学 分析化学
- 生物化学 生化学
- 频谱学是一种光谱学.
背景情况:
- 表面增强拉曼散射 (SERS) 在识别复杂的同位素生物分子方面面临挑战,因为灵敏度和特异性较低.
- 现有的分子探针具有灵敏度,但缺乏用于区分类似结构的光谱特异性.
研究的目的:
- 开发一种SERS战略,用于结构类型的分子识别的高光谱特异性.
- 通过电荷和几何学互补性方法,证明同位素二丁硫酸盐 (CS) 的有效分化.
主要方法:
- 在SERS分析中使用4-mercaptopyridine (MPY) 作为分子探针.
- 作为模型分析物,使用了具有不同硫化模式的氏素硫酸盐 (CS) 脱糖体.
- 综合实验和in silico研究,以调查探头-分析物相互作用.
主要成果:
- 通过MPY和CS同位素之间的"电荷和几何互补性"实现了高光谱特异性.
- 展示了特定于特定地点的,模仿分子对接的多牙相互作用.
- 对4个CS异构体实现了>97%的分类准确性,并确定了潜在的干扰.
- 启用了多重CS量化,预测误差为<3%.
结论:
- "电荷和几何相辅相成"的策略使生物相关异构体的精确SERS差异化成为可能.
- 这种方法显著提高了SERS对复杂生物分子的分子识别能力.
- 这些发现支持SERS在生物诊断,食品和环境监测方面的实际应用.
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