Milled wood lignin (MWL), organosolv lignin (OL) and alkaline lignin (AL) were sequentially fractionated from Tamarix spp. with dioxane, alkaline organosolv and alkaline solutions. Sugar analysis showed that the alkaline organosolv extraction released a high yield of lignin (17.7%) in a high purity (carbohydrates, 0.79%). The molecular weights decreased in the order of OL > MWL > AL. HSQC spectra indicated that the OL preparation (S/G 3.3) was nearly free of acetylating groups, and the MWL sample (S/G 2.3) showed a relatively high acetylation degree (53% of side chains) at the ?-carbon with p-coumarate and/or acetate groups. The highly acetylated lignin had a low S/G ratio. The MWL was characterized by a predominance of �-O-4' ether linkages (up to 91% of all linkages), and a strikingly low abundance of �-�' (6%) resinol linkages. Furthermore, minor amounts of �-5' phenylcoumaran (2%) and �-1' spirodienone (1%) type linkages were detected.

Fractionation and structural characterization of lignin isolated by organic solvents and alkaline solutions from <i>Tamarix</i> spp

243rd National Meeting (2012)

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Fractionation and structural characterization of lignin isolated by organic solvents and alkaline solutions from Tamarix spp