A comparison of alkaline and organosolv lignin extraction methods from coconut husks as an alternative material for green applications

A comparison of alkaline and organosolv lignin extraction methods from coconut husks as an alternative material for green applications

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 complementa...

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Bibliographic Details
Published in:Bioresources Vol. 17; no. 1; pp. 469 - 491
Main Authors: Abd Latif, N, Brosse, N, Ziegler-Devin, I, Chrusiel, L, Hashim, R, Hussin, M
Format: Journal Article
Language:English
Published: Raleigh North Carolina State University 01-02-2022
Subjects:
Alcohol
Biomass
Catalytic cracking
Cellulose
Chemical and Process Engineering
Chemical Sciences
Chemicals
Chromatography
Electrolytes
Engineering Sciences
Fourier transforms
Functional groups
High performance liquid chromatography
Infrared analysis
Infrared spectroscopy
Laboratories
Lignin
Liquid chromatography
Materials
Molecular weight
NMR
NMR spectroscopy
Nuclear magnetic resonance
Organic chemistry
Polymers
Pulping
Spectroscopy
Spectrum analysis
Stainless steel
Malaysia
Israel
United Kingdom > UK
United States > US
Organosolv lignin
Alkaline lignin
Coconut husk
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Summary: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.
ISSN:1930-2126
1930-2126
DOI:10.15376/biores.17.1.469-491