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A Comparison of Alkaline and Organosolv Lignin Extraction Methods from Coconut Husks as an Alternative Material for Green Applications

Abstract : Effects of alkaline (kraft and soda) and organosolv pulping were evaluated relative to the structural properties of lignin isolated from coconut husk (CH) biomass. The various types of functional groups within the isolated lignin samples were characterized and compared using a variety of complementary analyses including Fourier-transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, gel permeation chromatography (GPC), and high-performance liquid chromatography (HPLC). All isolated CH lignin samples contained a significant quantity of non-condensed guaiacyl-type (G) and syringyl-type (S) units but a lesser amount of p-hydroxyphenyl (H) units, as demonstrated and supported by previous research. The alkaline CH lignin produced lignin with higher molecular weight (Mw SL: 959 g mol-1 > Mw KL: 769 g mol-1) than the organosolv lignin (Mw OL: 606 g mol-1) sample, resulting in smaller fragments and a higher degree of solubility in water or other solvents. Because of significant differences in the physicochemical characteristics of the various lignin polymers, their properties and structure were improved with respect to alternative approaches in lignin-based applications.
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https://hal.univ-lorraine.fr/hal-03448122
Contributor : Nicolas Brosse Connect in order to contact the contributor
Submitted on : Thursday, November 25, 2021 - 8:39:03 AM
Last modification on : Friday, November 26, 2021 - 3:17:02 AM

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Nur Hanis Abd Latif, Nicolas Brosse, Isabelle Ziegler-Devin, Laurent Chrusiel, Rokiah Hashim, et al.. A Comparison of Alkaline and Organosolv Lignin Extraction Methods from Coconut Husks as an Alternative Material for Green Applications. Bioresources, North Carolina State University, 2021, ⟨10.15376/biores.17.1.469-491⟩. ⟨hal-03448122⟩

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