## Abstract The ^17^O NMR chemical shifts of five enriched amino acids have been measured under strictly controlled conditions of concentration, ionic strength, pH and temperature. The ฮฑ, ฮฒ and ฮฑ, ฮณ carboxyl resonances of aspartic and glutamic acid, respectively, have been resolved. Line widths wer
17O nuclear magnetic resonance studies of some amino acids at natural abundance
โ Scribed by B. Valentine; T. St Amour; R. Walter; D. Fiat
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 120 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
โฆ Synopsis
Abstract
^17^O chemical shifts of four amino acids at natural abundance have been obtained. Sensitivity was enhanced by accumulating a large number of scans or employing high concentrations at elevated temperature. Routine memory overflow was avoided by using a combination of solvent suppression and phase alternating pulse sequences.
๐ SIMILAR VOLUMES
## Abstract Complexation between crown ethers 12C4, 15C5, 18C6 and cryptand 222, and alkali cations Li^+^, Na^+^, K^+^ in various solvents were studied by ^17^OโNMR. spectroscopy. Small diamagnetic shifts arising from the cation electric field are observed. They increase according to the sequence K
## Abstract A number of carbonylโbisโ(amino acid esters) have been examined by proton and carbonโ13 nuclear magnetic resonance techniques. All but one of the compounds were synthesized with two chiral centers of likeโconfiguration. In one series, the diastereotopic nonequivalence of isopropyl methy
Temperature dependence of 17 O nuclear quadrupole resonance frequencies was measured in solid 2-nitrobenzoic acid by a 1 H-17 O nuclear quadrupole double resonance technique. The experimental results show the presence of a fast exchange of hydrogen atoms between two nonequivalent positions within th