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Use of natural abundance 15N DEPT NMR to investigate curing of urea–formaldehyde resin in the presence of wood fibers

✍ Scribed by B. D. Gill; M. Manley-Harris; R. A. Thomson

Publisher: John Wiley and Sons
Year: 2003
Tongue: English
Weight: 127 KB
Volume: 41
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1219

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✦ Synopsis

Abstract

Natural abundance ^15^N NMR using a DEPT pulse sequence was employed to follow the curing of urea–formaldehyde resin in the presence of wood fiber, fiber extracts and acid or base. The advantages of ^15^N NMR, large range chemical shifts, simplification of spectra and lack of interference by additives, can be exploited. The disadvantages of low sensitivity and long relaxation delays are offset by using a cross‐polarization technique. Copyright © 2003 John Wiley & Sons, Ltd.

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✍ Geoffrey E. Hawkes; Edward W. Randall; William E. Hull; Odile Convert 📂 Article 📅 1980 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 615 KB

## Abstract The natural‐abundance ^15^N‐nuclear magnetic resonance (nmr) spectrum of the cyclic decapeptide gramicidin S has been measured and assigned in the solvents dimethyl sulfoxide, methanol, and 2,2,2‐trifluoroethanol. Three methods have been investigated to distinguish between peptide group