Molecular interactions in polyurea by 1-D and 2-D n.m.r.
β Scribed by Xingjun Lu; Yuanshen Wang; Xuewen Wu
- Book ID
- 107846771
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 413 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0032-3861
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Man-(1+6)]-/3-o-Man-OMe, which are structural elements of xylose-containing carbohydrate chains from N-glycoproteins, have been made on the basis of 1D and 2D (DQF 'H-JH COSY, HOHAHA) 500-MHz 'H-n.m.r. spectroscopy and 1D SO-MHz i3C-n.m.r. spectroscopy, respectively. EXPERIMENTAL N.m.r. methods. -N.
Three isotope-edited n.m.r. methods have been applied to selectively 13C-substituted monosaccharides and nucleosides to simplify their spectra and/or measure 1H-1H, 13C-1H, or 13H-13C spin-couplings detected via the labeled site. 1D INADEQUATE spectra allowed the selective detection of the natural-a
2D 'H-N.m.r. spectroscopy applied to phosphorylated myo-inositols can indicate the number and the sites of phosphorylation, and up to three isomers can be completely analyzed simultaneously. The resonance of the sole equatorial proton (H-2) is shifted furthest downfield (to -4.7 p.p.m.) when C-2 is