Laage Ségolène, Marchetti Alessandro, Sein Julien, Pierattelli Roberta, Sass Hans Juergen, Grzesiek Stephan, Lesage Anne, Pintacuda Guido, Emsley Lyndon
Université de Lyon, CNRS/ENS Lyon/UCB-Lyon 1, Centre RMN à Très Hauts Champs, 5 rue de la Doua, 69100 Villeurbanne, France.
J Am Chem Soc. 2008 Dec 24;130(51):17216-7. doi: 10.1021/ja805926d.
A magic angle spinning (MAS) NMR technique to transfer polarization from protons to a specific set of the (13)C spins is introduced for the study of biomolecular samples in the solid-state. Ultrafast (>60 kHz) MAS and low irradiation rf fields are used to achieve band-selective Hartmann-Hahn cross-polarization (CP) between the whole proton bath and carbons whose resonances are close to the (13)C-transmitter offset. When compared to conventional, broadband (1)H-(13)C CP, the band-selective experiment can be established without any loss of sensitivity when polarizing the aliphatic signals of a protein sample, and with a significant gain when polarizing carbonyls. This scheme can be used as a building block in 2D (13)C-(13)C homonuclear correlation experiments to obtain a faster and more sensitive characterization of biological solids.
介绍了一种用于固态生物分子样品研究的魔角旋转(MAS)核磁共振技术,该技术可将质子的极化转移到特定的一组(13)C自旋上。利用超快(>60 kHz)MAS和低辐射频场,在整个质子池与共振靠近(13)C发射机偏移的碳之间实现带选择性哈特曼-哈恩交叉极化(CP)。与传统的宽带(1)H-(13)C CP相比,在极化蛋白质样品的脂肪族信号时,带选择性实验在不损失任何灵敏度的情况下即可建立,而在极化羰基时灵敏度则显著提高。该方案可作为二维(13)C-(13)C同核相关实验的一个组成部分,以更快、更灵敏地表征生物固体。