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Polarization transfer by cross-correlated relaxation in solution NMR with very large molecules (CRINEPT)
Polarization transfer by cross-correlated relaxation in solution NMR with very large molecules (CRINEPT)
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机译：通过互相关弛豫在溶液NMR中与非常大的分子进行极化转移（CRINEPT）
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摘要
A method for performing polarization transfer in NMR experiments with coupled spin ½ nuclei I and S being irradiated by a sequence of rf pulses comprising a first 90° pulse exciting the spins of the nuclei I and after a delay time a further 90° pulse exciting the spins of the nuclei S is characterized in that there is no inversion pulse acting on the spins of the nuclei S during a time period T between the first 90° pulse exciting the spins of the nuclei I and either the further 90° pulse exciting the spins of the nuclei S or a second 90° pulse acting on the spins of the nuclei I, and that the length of the time period T is chosen such that ]]> is minimized, whereRC is the transverse cross-correlation-relaxation rate of nuclei I ,RI is the total transverse relaxation rate of nuclei I and JIS is the scalar coupling constant between nuclei I and S.;This provides a novel polarization transfer element which can be used as a "building block" for a great variety of complex NMR experiments including macromolecules with molecular weights far beyond 100000 and yielding higher sensitivity in comparison with methods according to the state of the art such as INEPT.
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