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The New Active-Coupling-Pattern Tilting Experiment for an Efficient and Accurate Determination of Homonuclear Coupling Constants

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A new constant-time COSY experiment which allows an efficient determination of accurate homonuclear coupling constant values is presented. Characteristic features include an improved scheme for homonuclear active-coupling-pattern tilting (ACT) and an arbitrarily scaled shift and coupling information (ASSCI) design of the F1 domain. As a result, simple and easy to interpret tilted cross-peak patterns, even for two-spin systems, are obtained with good sensitivity. The relative spacing of chemical-shift differences and coupling splittings is largely under experimental control. The effectiveness of the spectral region selective variant of the new sequence is demonstrated by a determination of the 3JHN, Hα couplings in a peptide sample. The multiplet-selective variant is shown to produce good results with a terpene. The superiority of the new ACT scheme is additionally demonstrated by an ACT–J spectrum of the peptide.

Document Type: Miscellaneous

Affiliations: Department of Chemistry, Warsaw University, ul. Pasteura 1, Warsaw, 02-093, Poland

Publication date: September 1, 1998

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