Surface and confinement effects on lipid films by NMR

本研究的主要目的是定性和定量地研究固体支持物和几何约束条件下脂质膜的分子有序性和动力学。这些影响的理解是重要的，因为它们在生物传感和生物分离的潜在应用。在静态和魔角样品旋转条件下工作的各种NMR方法将用于获得关于1H和13 C-1H残余偶极耦合的信息，这些偶极耦合可以与动态序参数和分子动力学的异质性相关。这些影响将被调查的脂质膜的控制厚度相当于几个单层亚单层在亚微米圆柱孔。质子双量子（DQ），三重（TQ）量子相干以及1H DQ和TQ编辑光谱和异质局域场光谱将用于研究在不同的分子覆盖度，孔径和温度下的表面诱导有序。分子动力学的非均匀性将使用磁化交换（自旋扩散）技术进行研究。一个理论模型足以描述这个过程中的接枝分子将被开发。在样品取向下进行核磁共振实验将细化有关动力学非均匀性的信息。残留偶极耦合的异质性沿着生物分子将使用间谍氘代分子测量。

The main goal of this project is to characterize qualitatively and quantitatively the molecular order and dynamics of lipid films induced by the solid supports and the geometrical confinement. The understanding of these effects is important due to their potential applications in biosensing and bioseparations. Various NMR methods working under static and magic angle sample spinning conditions will be used to obtain information about the 1H and 13C-1H residual dipolar couplings that can be correlated with dynamic order parameters and heterogeneity of molecular dynamics. These effects will be investigated for lipid films of controlled thickness equivalent to few monolayers to submonolayers in submicron cylindrical pores. Proton double-quantum (DQ), triple (TQ) quantum coherences as well as 1H DQ and TQ edited spectra and heteronuclear local filed spectroscopy will be used for investigation of surface induced order at different molecular coverage, pore size and temperature. The heterogeneity of molecular dynamics will be investigated using magnetization exchange (spin diffusion) technique. A theoretical model adequate for description of this process for grafted molecules will be developed. Performing NMR experiments under sample orientation will refine the information about dynamics heterogeneities. The heterogeneity of residual dipolar couplings along the biomolecule will be measured using a spy deuterated molecule.