✦ LIBER ✦

SQUID-NQR of nitrogen-14 in amino acids and small peptides

✍ Scribed by U. Werner; B. Black; M. Ziegeweid; A. Pines

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 448 KB
Volume: 209
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)87194-8

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✦ Synopsis

We present a technique for the study of nuclear quadrupole resonance of "N interacting with low electric field gradients as found, for example, in amino acids. A superconducting quantum interference device (SQUID) is used to detect directly small NMR signals via cross relaxation of the 14N polarization to adjacent proton spins, eliminating the need for field cycling. When one nitrogen quadrupolar transition matches the proton Zeeman splitting, the remaining two quadrupolar transitions can be observed by sweeping a saturating rf field through resonance. In addition, signal enhancement by simultaneous excitation of two nitrogen resonances helps to identify connected transitions.

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