Reduction of RF-induced sample heating with a scroll coil resonator structure for solid-state NMR probes |
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Authors: | Stringer John A Bronnimann Charles E Mullen Charles G Zhou Donghua H Stellfox Sara A Li Ying Williams Evan H Rienstra Chad M |
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Institution: | Varian, Inc., 2607 Midpoint Drive, Fort Collins, CO 80525, USA. |
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Abstract: | Heating due to high power 1H decoupling limits the experimental lifetime of protein samples for solid-state NMR (SSNMR). Sample deterioration can be minimized by lowering the experimental salt concentration, temperature or decoupling fields; however, these approaches may compromise biological relevance and/or spectroscopic resolution and sensitivity. The desire to apply sophisticated multiple pulse experiments to proteins therefore motivates the development of probes that utilize the RF power more efficiently to generate a high ratio of magnetic to electric field in the sample. Here a novel scroll coil resonator structure is presented and compared to a traditional solenoid. The scroll coil is demonstrated to be more tolerant of high sample salt concentrations and cause less RF-induced sample heating. With it, the viable experimental lifetime of a microcrystalline ubiquitin sample has been extended by more than an order of magnitude. The higher B1 homogeneity and permissible decoupling fields enhance polarization transfer efficiency in 15N-13C correlation experiments employed for protein chemical shift assignments and structure determination. |
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