01967nas a2200205   4500008004100000022001400041245017600055210006900231260000800300300001400308490000700322520116900329653001801498653004401516653001101560653001501571100002201586700002201608856013101630       2022                        eng d  a1877-264100aAlpha-, beta- and gamma-cellulose quantification and two-stage concentrated-dilute acid lignin recovery from three rice husks: lignin characterization and depolymerization0 aAlpha beta and gammacellulose quantification and twostage concen  cJUN  a2963-29770 v133 a<p>
	Investigations on the compositional analysis of lignocellulosic materials and their properties upon recovery are essential to be studied in order to examine the effects of recovery method, their dependency on the substrate, etc. In this work, three rice husks (RHs) samples were subjected for alpha-, beta- and gamma-cellulose, pentosan, and silica quantifications. Correlations between the source of biomass, lignin recovery by two-stage concentrated and dilute sulphuric acid treatment, their properties and their depolymerization into low molecular mass aromatic fractions using homogeneous and heterogeneous Bronsted acidic ionic liquids as catalysts, is carried out. Correlation between the properties of RHs and recovered lignin were performed using destructive (CHNS, TGA, ICP-OES, etc.) and non-destructive (XRD, UV-Visible, FT-IR, and C-13 CP-MAS NMR) analytical techniques. It was observed that the recovered lignin was polysaccharides free and associated with dibenzodioxocin, spirodienone, and tricin type moieties with variable intensities. The effects of lignin structures showed a change of depolymerisation product pattern. [GRAPHICS] .</p>
10aHolocellulose10aHomogeneous and heterogeneous catalysts10alignin10aRice husks1 aSingh, Sandip, K.1 aDhepe, Paresh, L.  uhttps://library.ncl.res.in/content/alpha-beta-and-gamma-cellulose-quantification-and-two-stage-concentrated-dilute-acid-lignin02594nas 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