Oxidative Depolymerization of Alkaline Lignin from Pinus Pinaster by Oxygen and Air for Value-Added Bio-Sourced Synthons.

ABSTRACT: In this work, an efficient 3-step process targeting the chemical modification and purification of lignin oligomers from industrial alkaline lignin is described. The oxidative depolymerization process of alkaline lignin with O₂ or Air pressure, without use of metal catalyst, led to the production of two fractions of lignin oligomers named 'precipitated lignin' and 'hydrosoluble lignin' with 40% and 60% yield, respectively. These fractions were characterized with a wide range of methods including NMR spectroscopy (31P, 2D-HSQC), SEC (in basic media), FTIR. NMR analyses revealed the presence of carboxylic acid functions at a ratio of 1.80 mmol/g and 2.80 mmol/g for the precipitated and hydrosoluble lignin, respectively, values much higher than what is generally found in native lign

SUBMITTER: Camus M 

PROVIDER: S-EPMC8587034 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature