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

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 O<sub>2</sub> or Air pressure, without use of metal catalyst, le...

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Autores principales:	Martin Camus, Olivia Condassamy, Frédérique Ham-Pichavant, Christelle Michaud, Sergio Mastroianni, Gérard Mignani, Etienne Grau, Henri Cramail, Stéphane Grelier
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	lignin oxidative depolymerization oxygen air oligomers hydrosoluble lignin Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/65a261b6984f49f286f7889cdf942c16
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spelling	oai:doaj.org-article:65a261b6984f49f286f7889cdf942c162021-11-11T18:45:25ZOxidative Depolymerization of Alkaline Lignin from Pinus Pinaster by Oxygen and Air for Value-Added Bio-Sourced Synthons10.3390/polym132137252073-4360https://doaj.org/article/65a261b6984f49f286f7889cdf942c162021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3725https://doaj.org/toc/2073-4360In 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 O<sub>2</sub> 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 lignin (between 0.2 and 0.5 mmol/g). SEC analyses revealed the formation of low molar masses for the precipitated (2200 g/mol) and hydrosoluble fractions (1500 g/mol) in contrast to the alkaline lignin (3900 g/mol). It is worth noting that the hydrosoluble fraction of lignin is soluble in water at any pH. Both processes (oxygen and air) were successfully scaled up and showed similar results in terms of yield and functionalization.Martin CamusOlivia CondassamyFrédérique Ham-PichavantChristelle MichaudSergio MastroianniGérard MignaniEtienne GrauHenri CramailStéphane GrelierMDPI AGarticleligninoxidative depolymerizationoxygenairoligomershydrosoluble ligninOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3725, p 3725 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	lignin oxidative depolymerization oxygen air oligomers hydrosoluble lignin Organic chemistry QD241-441
spellingShingle	lignin oxidative depolymerization oxygen air oligomers hydrosoluble lignin Organic chemistry QD241-441 Martin Camus Olivia Condassamy Frédérique Ham-Pichavant Christelle Michaud Sergio Mastroianni Gérard Mignani Etienne Grau Henri Cramail Stéphane Grelier Oxidative Depolymerization of Alkaline Lignin from Pinus Pinaster by Oxygen and Air for Value-Added Bio-Sourced Synthons
description	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 O<sub>2</sub> 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 lignin (between 0.2 and 0.5 mmol/g). SEC analyses revealed the formation of low molar masses for the precipitated (2200 g/mol) and hydrosoluble fractions (1500 g/mol) in contrast to the alkaline lignin (3900 g/mol). It is worth noting that the hydrosoluble fraction of lignin is soluble in water at any pH. Both processes (oxygen and air) were successfully scaled up and showed similar results in terms of yield and functionalization.
format	article
author	Martin Camus Olivia Condassamy Frédérique Ham-Pichavant Christelle Michaud Sergio Mastroianni Gérard Mignani Etienne Grau Henri Cramail Stéphane Grelier
author_facet	Martin Camus Olivia Condassamy Frédérique Ham-Pichavant Christelle Michaud Sergio Mastroianni Gérard Mignani Etienne Grau Henri Cramail Stéphane Grelier
author_sort	Martin Camus
title	Oxidative Depolymerization of Alkaline Lignin from Pinus Pinaster by Oxygen and Air for Value-Added Bio-Sourced Synthons
title_short	Oxidative Depolymerization of Alkaline Lignin from Pinus Pinaster by Oxygen and Air for Value-Added Bio-Sourced Synthons
title_full	Oxidative Depolymerization of Alkaline Lignin from Pinus Pinaster by Oxygen and Air for Value-Added Bio-Sourced Synthons
title_fullStr	Oxidative Depolymerization of Alkaline Lignin from Pinus Pinaster by Oxygen and Air for Value-Added Bio-Sourced Synthons
title_full_unstemmed	Oxidative Depolymerization of Alkaline Lignin from Pinus Pinaster by Oxygen and Air for Value-Added Bio-Sourced Synthons
title_sort	oxidative depolymerization of alkaline lignin from pinus pinaster by oxygen and air for value-added bio-sourced synthons
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/65a261b6984f49f286f7889cdf942c16
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Oxidative Depolymerization of Alkaline Lignin from Pinus Pinaster by Oxygen and Air for Value-Added Bio-Sourced Synthons

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