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原子电性作用矢量和杂化状态指数用于氨基酸核磁共振碳谱模拟
Atomic Electronegativity Interaction Vector and Atomic Hybridation State Index for Spectroscopic Simulation of 13C Nuclear Magnetic Resonance of Amino Acids
【摘要】 提出了用于表征分子局部化学微环境及原子所处杂化状态的结构描述子:原子电性作用矢量(AEIV)和原子杂化状态指数(AHSI),将其应用于20个天然氨基酸103个碳原子13C核磁共振模拟中,取得满意结果。模型计算值、留一法(LOO-CV)交互校验预测值和新颖的留一分子法(LMO)交互校验预测值的复相关系数分别为r=0.9948、0.9940和0.9924。进一步使用4个非天然氨基酸化学位移值来测试该模型的预测能力,预测复相关系数为r=0.9940。
【Abstract】 A quantitative structure-spectroscopy relationship method based on both novel atomic electronegativity interaction vector(AEIV) and atomic hybridation state index(AHSI) was developed for expression of local chemical microenvironment and atomic hybridation state.By using AEIV and AHSI,it was successfully modeled that one hundred and three 13C nuclear magnetic resonance(NMR) chemical shift of twenty coded(amino) acids.The correlation coefficients of modeling estimation,leave-one-out cross-validation(LOO-CV) predicted value and leave-molecule-out(LMO) cross-validation predicted value were 0.9948,0.9940 and 0.9924,respectively.Afterwards,this model was tested by 13C NMR chemical shift of four non-coded amino acids with the prediction correlation coefficients being 0.9940.
【Key words】 Atomic electronegativity interaction vector; atomic hybridation state index; amino acid; spectroscopic simulation of 13C nuclear magnetic resonance; quantitative structure-spectroscopy relationship; chemical microenvironment;
- 【文献出处】 分析化学 ,Chinese Journal of Analytical Chemistry , 编辑部邮箱 ,2006年02期
- 【分类号】O621.13;O657.2
- 【被引频次】18
- 【下载频次】90