Composition and structure of organosolv lignins from four eucalypt species

Lignins were extracted from different species using organosolv process (ethanol/water). Obtained organosolv lignins were characterised by various methods to determine their composition, structure and functional groups with the purpose of evaluating their potential use for obtaining value-added compo...

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Bibliographic Details
Published in:Wood science and technology 2014, Vol.48 (4), p.873-885
Main Authors: dos Santos, Patrícia S. B, de Cademartori, Pedro Henrique G, Prado, Raquel, Gatto, Darci A, Labidi, Jalel
Format: Article
Language:English
Subjects:
antioxidant activity
Antioxidants
Biomedical and Life Sciences
Ceramics
Chemical properties
Composites
Composition
Contamination
Ethanol
Eucalyptus
Functional groups
G ratio
Glass
Gravimetric analysis
Infrared analysis
Infrared spectroscopy
Lemons
Life Sciences
Lignin
Machines
Manufacturing
Molecular weight
Molecular weight distribution
Natural Materials
Nitrobenzene
Organic chemistry
Original
Oxidation
Phenols
Polydispersity
Processes
Purity
Sugar
sugars
value added
wood
Wood Science & Technology
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Summary:Lignins were extracted from different species using organosolv process (ethanol/water). Obtained organosolv lignins were characterised by various methods to determine their composition, structure and functional groups with the purpose of evaluating their potential use for obtaining value-added compounds. The purity of organosolv lignins was determined. The total phenols content and the antioxidant power were analysed in order to know the reactivity of lignins. The ratio S/G was determined by nitrobenzene oxidation. In addition, molecular weight distribution, infrared spectroscopy and thermo gravimetrical analysis were carried out in order to determine the physical and chemical properties of organosolv lignins. Obtained organosolv lignins have very high purity and low sugar and inorganic contamination. All organosolv lignins samples have high polydispersity, and lignin from grey ironbark wood had the highest molecular weight average. Among the organosolv lignins, lemon-scented gum showed the highest average value of S/G ratio and the lowest average value of total phenols.
ISSN:0043-7719
1432-5225
DOI:10.1007/s00226-014-0646-z