Guadient- and sensitivity-enhanced TOCSY experiments

A pulsed held gradient version of the sensitivity-enhanced 2D TOCSY experiment is proposed which yields high-quality spectra with improved sensitivity and a minimum of two scans per t(1) increment, For rapid acquisition of 1D TOCSY spectra, the 1D DPFGSE-TOCSY experiment was modified to include phase-encoded multiple-selective excitation followed by a simple spectral editing. Combination of these two building blocks is used in a sensitivity-enhanced 2D analog of the 3D TOCSY-TOCSY experiment which provides an efficient tool for resolving severely overlapped signals of oligomers in short experimental time. (C) 1998 Academic Press.