Journal of the American Chemical Society, Vol.130, No.33, 10850-10850, 2008
Evidence for dynamics on a 100 ns time scale from single- and double-quantum nitrogen-14 NMR in solid peptides
The indirect detection of N-14 spectra via protons in the manner of heteronuclear multiple-quantum correlation (HMQC) allows one to obtain single- (SQ) and double-quantum (DQ) N-14 spectra in solids. A comparison of the SQ and DQ line widths as a function of temperature with simulations reveals motions in the tripeptide AAG with rates on the order of 10(7) s(-1) at 49 degrees C.