title: Structural characterization of the lignin from jute (Corchorus capsularis) fibers.
abstract: The structural characteristics of the lignin from jute (Corchorus capsularis ) fibers, which are used for high-quality paper pulp production, were studied. The lignin content (13.3% Klason lignin) was high compared to other nonwoody bast fibers used for pulp production. The lignin structure was characterized by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), 2D-NMR, and thioacidolysis. Upon Py-GC/MS, jute fibers released predominantly products from syringylpropanoid units with the S/G ratio being 2.1 and a H/G/S composition of 2:33:65. 2D-NMR of the milled wood lignin (MWL) isolated from jute fibers showed a predominance of beta-O-4' aryl ether linkages (72% of total side chains), followed by beta-beta' resinol-type linkages (16% of total side chains) and lower amounts of beta-5' phenylcoumaran (4%) and beta-1' spirodienone-type (4%) linkages and cinnamyl end groups (4%). The high predominance of the S-lignin units, together with the high proportion of beta-O-4' aryl ether linkages, which are easily cleaved during alkaline cooking, are advantageous for pulping. On the other hand, a small percentage (ca. 4%) of the lignin side chain was found to be acetylated at the gamma-carbon, predominantly over syringyl units. The analysis of desulphurated thioacidolysis dimers provided additional information on the relative abundances of the various carbon-carbon and diaryl ether bonds and the type of units (syringyl or guaiacyl) involved in each of the above linkage types. Interestingly, the major part of the beta-beta' dimers included two syringyl units, indicating that most of the beta-beta' substructures identified in the HSQC spectra were of the syringaresinol type (pinoresinol being absent), as already observed in the lignin of other angiosperms.
authors.affiliation: Instituto de Recursos Naturales y Agrobiologia de Sevilla, CSIC, PO Box 1052, E-41080 Seville, Spain. delrio@irnase.csic.es
authors.forename: José C
authors.initials: JC
authors.lastname: del Río
authors.forename: Jorge
authors.initials: J
authors.lastname: Rencoret
authors.forename: Gisela
authors.initials: G
authors.lastname: Marques
authors.forename: Jiebing
authors.initials: J
authors.lastname: Li
authors.forename: Göran
authors.initials: G
authors.lastname: Gellerstedt
authors.forename: Jesús
authors.initials: J
authors.lastname: Jiménez-Barbero
authors.forename: Angel T
authors.initials: AT
authors.lastname: Martínez
authors.forename: Ana
authors.initials: A
authors.lastname: Gutiérrez
mesh_terms: D032381:Corchorus / Q000737:chemistry*; D008031:Lignin / Q000737:chemistry*
chemical_list: D008031:Lignin