Characterization of lignin isolated from some nonwood available in Bangladesh [An article from: Bioresource Technology]

This digital document is a journal article from Bioresource Technology, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Lignins isolated from cotton stalks, jute stick and dhaincha by acidolytic dioxane were characterized using alkaline nitrobenzene oxidation, elemental analysis, methoxyl analysis and molecular weight analysis and UV, IR ^1H NMR spectroscopy. The C"9 formulas for cotton stalks, jute stick and dhaincha (Sesbania aculeata) lignin were C"9H"9"."3"6O"4"."5"0(OCH"3)"1"."2"3, C"9H"9"."0"2O"4"."5"7(OCH"3)"1"."3"5 and C"9H"8"."8"8O"4"."6"5(OCH"3)"1"."5"0, respectively. All three lignins were of the guaiacyl-syringyl type. Cotton stalks lignin contained more p-hydroxy phenyl unit than dhaincha and jute stick lignins as observed by alkaline nitrobenzene oxidation products. The @b-O-4 units in these nonwood lignins had predominately erythro stereochemistry type.