Open Access

ARTICLE

Structural Characterization and Antioxidant Activity of Lignin Extracted from Ficus Carica L.

Ibtissem Moussa^1,2, Ramzi Khiari^1,3,4,*, Ali Moussa², Gérard Mortha⁴, Mohamed Farouk Mhenni¹

1 University of Monastir, Faculty of Sciences, UR13 ES 63 Resear h Unity of Applied Chemistry & Environment, Avenue of the environment, 5019 Monastir, Tunisia.
2 University of Monastir, National Engineering School of Monastir, Street of Ibn El Jazzar, 5000 Monastir, Tunisia.
3 Higher Institute of Technological Studies of Ksar ellal, Department of Textile Tunisia, Avenue of Hadj Ali Soua. 5070 Ksar Hellal, Tunisia.
4 University of Grenoble Alpes, CNRS, Grenoble INP, LGP2, F 38000 Grenoble, France

* Corresponding Author:Ramzi Khiari. Email:

Journal of Renewable Materials 2019, 7(4), 345-354. https://doi.org/10.32604/jrm.2019.04011

Abstract

The most abundant phenolic biopolymer in the biosphere is the lignin. This phenolic biopolymer commonly exists in combination with polysaccharides and other cell wall components. In this study, the solvent system dioxane-water is used to extract lignin, which is considered as unaltered native lignin. The dioxane lignin extracted from fig stems was characterized regarding to its structural feature, quantification of its functional groups, molecular weight, and evaluation of its thermal properties. Purity and molecular weight distribution of the studied lignin indicated that isolated lignin contained a low amount of sugar (c.a. 19%) and had a high weight-average molecular weight (10 068 g.mol-1). Lignin sample had approximately the same amounts of guaiacyl (G) and p-hydroxyphenyl (H) units with relatively fewer syringyl (S) units. The isolated lignin revealed good antioxidant properties. Therefore, it proved to have a high potential of application in new antioxidants formulations.

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