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-lignin