The individual states of order of cellulose found within Valonia, Clad
ophora, Halocynthia, cotton and wood cellulose were quantified by non-
linear least-squares fitting of the C-13 NMR spectra. The results from
the spectral fittings indicated that a cellulose form giving signals
at delta 104.5 (C-1 region) and delta 88.1-88.5 (C-4 region) was prese
nt in all the investigated samples. Partial signal suppression by spin
-lattice relaxation supported the findings from the spectral fittings.
The spectral behavior of this cellulose form indicates it is a less-o
rdered or a para-crystalline 'in core' structure with a somewhat large
r mobility than the crystalline cellulose I alpha and I beta allomorph
s. (C) 1997 Elsevier Science Ltd.