Lv. Kanitskaya et al., Inhomogeneity of the chemical structure of lignins isolated from various plant tissues: H-1 and C-13 NMR study, POLYM SCI A, 42(6), 2000, pp. 694-698
The chemical structure of dioxane lignins isolated from the whole cotton pl
ant stem (DLS), its inner part (DLIS), and the cotton plant bark (DLB) was
studied by H-1 and C-13 NMR spectroscopy. It was demonstrated that DLS and
DLIS are distinguished only by the degree of condensation and the number of
aryl-aryl ether and ester bonds. On the contrary, the chemical structure o
f DLB is markedly different from that of DLS and DLIS by the ratio of the s
tructure-forming units S and C, the presence of a great amount of pyrocatec
hol moieties, the content of functional groups, and the length of side chai
ns.