02594nas a2200253   4500008004100000022001400041245010100055210006900156260000800225300001400233490000700247520177600254653001202030653002002042653001802062653002802080653001702108653001102125653001602136100002202152700002802174700002202202856011602224       2024                        eng d  a2190-681500aLignocellulosic biomass analysis: acidic lignin recovery, characterisation, and depolymerisation0 aLignocellulosic biomass analysis acidic lignin recovery characte  cFEB  a5239-52490 v143 a<p>
	For the development of an effective lignocellulosic biomass conversion technology to biofuels and chemicals, the biomass composition analysis and their properties need to be characterised prior to biomass valorisation, including polysaccharide hydrolysis and lignin depolymerisation. In this work, a facile colorimetric titration method for the quantification of alpha-, beta-, and gamma-cellulose, pentosan, lignin, and silica percentages of wheat straw (WS) and two bagasse (BG I and II) samples was done. The result showed higher amounts of structural biopolymers (i.e. holocellulose and lignin (similar to 89.3%)) in BG compared to WS (81%) sample. Lignin recovery from BG (I and II) and WS samples was done by applying two-stage concentrated and dilute sulphuric acid hydrolysis, and maximum recovery (i.e. 21.5%; acid soluble +insoluble) of lignin obtained from BG II sample. Elemental and composition analysis results were represented substantial differences in lignin properties, including higher heat values (19.8 MJkg(-1)) of recovered lignin from BG II as well as high amounts of silica percentage from WS lignin. An intense Si-O-Si asymmetric stretching mode and/or C-O-C aliphatic aromatic ether (similar to 1100 cm(-1)) was characterised for lignin derived from WS. C-13 CP-MAS NMR exhibited variable intensities for dibenzodioxocin, spirodienone, and tricin moieties in recovered lignin samples. These lignin samples were processed for depolymerisation using homogeneous (1-methyl-3-(3-sulphopropyl)-imidazolium hydrogen sulphate) and heterogeneous (immobilised Bronsted acidic ionic liquid) catalysts to lower molar mass aromatic fractions and represented 89% and 92% organic solvent-soluble product yields respectively from WS-derived lignin.</p>
10abagasse10aDibenzodioxocin10aHolocellulose10aLignin depolymerisation10aSpirodienone10aTricin10aWheat straw1 aSingh, Sandip, K.1 aMatsagar, Babasaheb, M.1 aDhepe, Paresh, L.  uhttps://library.ncl.res.in/content/lignocellulosic-biomass-analysis-acidic-lignin-recovery-characterisation-and