Very high-resolution H-1 MAS NMR of a natural polymeric material
authors Gil, AM; Lopes, MH; Neto, CP; Rocha, J
journal SOLID STATE NUCLEAR MAGNETIC RESONANCE
author keywords H-1 MAS NMR; relaxation; cork; suberin; cellulose; lignin
keywords QUERCUS-SUBER L; ECHO PULSE SEQUENCE; ROTATING SOLIDS; CORK; SPECTRA; LIGNINS; SPECTROSCOPY; HYDRATION; PROTON
abstract The use of ultrafast magic angle spinning (> 30 kHz) in tandem with delayed echo acquisition is shown to yield very high-resolution H-1 MAS NMR spectra of complex natural organic materials. For the first time, very high-resolution H-1 MAS NMR spectra are reported for cork and wood components, two natural materials with great economic importance. The effect of the spinning rate on the H-1 NMR spectra was evaluated with single-pulse acquisition and delayed-echo acquisition. The delayed-echo acquisition spectra presented linewidths as sharp as 67 and 25 Hz. The narrow peaks, characterised by proton spin-spin and spin-lattice relaxation, were assigned to the isotropic chemical shifts and the general spectral features were shown to correlate with the sample chemical structure. The tentative assignments of cork H-1 MAS NMR signals were presented. (C) 1999 Elsevier Science B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0926-2040
year published 1999
volume 15
issue 1
beginning page 59
ending page 67
digital object identifier (doi) 10.1016/S0926-2040(99)00047-8
web of science category Chemistry, Physical; Physics, Atomic, Molecular & Chemical; Physics, Condensed Matter; Spectroscopy
subject category Chemistry; Physics; Spectroscopy
unique article identifier WOS:000084215900007
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