Decoherence optimized tilted-angle cross polarization: A novel concept for sensitivity-enhanced solid-state NMR using ultra-fast magic angle spinning.
Related Articles Decoherence optimized tilted-angle cross polarization: A novel concept for sensitivity-enhanced solid-state NMR using ultra-fast magic angle spinning.
J Magn Reson. 2020 Oct 27;322:106857
Authors: Matsunaga T, Matsuda I, Yamazaki T, Ishii Y
Abstract
Ultra-fast magic-angle spinning (UFMAS) at a MAS rate (?R/2?) of 60*kHz or higher has dramatically improved the resolution and sensitivity of solid-state NMR (SSNMR). However, limited polarization transfer efficiency using cross-polarization (CP) between 1H and rare spins such as 13C still restricts the sensitivity and multi-dimensional applications of SSNMR using UFMAS. We propose a novel approach, which we call decoherence-optimized tilted-angle CP (DOTA CP), to improve CP efficiency with prolonged lifetime of 1H coherence in the spin-locked condition and efficient band-selective polarization transfer by incorporating off-resonance irradiation to 1H spins. 13C CP-MAS at ?R/2? of 70-90*kHz suggested that DOTA CP notably outperformed traditional adiabatic CP, a de-facto-standard CP scheme over the past decade, in sensitivity for the aliphatic-region spectra of 13C-labeled GB1 protein and N-formyl-Met-Leu-Phe samples by up to 1.4- and 1.2-fold, respectively. 1H-detected 2D 1H/13C SSNMR for the GB1 sample indicated the effectiveness of this approach in various multidimensional applications.
PMID: 33227675 [PubMed - as supplied by publisher]
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