Alkaline-extracted lignin from Xylia xylocarpa and its antioxidant properties

Karuna Nardrapee, . and Namwong Waleepatch, . and Ruaysoongnern Natchaporn, . Alkaline-extracted lignin from Xylia xylocarpa and its antioxidant properties. pp. 151-160. ISSN 2672-7226

The composition of Xylia xylocarpa (Roxb.) Taub. sawdust showed its potential to be used as a lignin source. It is composed of almost 40 lignin 20 glucan and 10 hemicellulose. In this work lignin in the sawdust was extracted with potassium hydroxide (KOH) in three different conditions: (1) 0.5 KOH for 10 minutes (2) 0.5 KOH for 30 minutes and (3) 1.5 KOH for 30 minutes. Then the lignin was precipitated by a two-step precipitation. The highest lignin content was extracted and recovered with a high purity of 96.1 from the 0.5 KOH for 10 minutes condition whereas the 1.5 KOH condition gave less lignin content. The ferric-reducing antioxidant power (FRAP) showed no significant values of all samples. The IC‚‚ of the 2 2-diphenyl-1-picrylhydrazyl (DPPH) assays showed that the lignin from the 1.5 KOH condition needed double compared to that of the other conditionsto neutralize DPPH for 50. The Fourier transform infrared spectroscopy results confirmed that the extracted lignin was mainly composed of guaiacyl and syringyl alcohol and the severity of the pretreatment affected the deformation of bonds in the lignin. Therefore this short (10 minutes) and low KOH (0.5) method could reduce the cost in biomass conversion.

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Abstract

The composition of Xylia xylocarpa (Roxb.) Taub. sawdust showed its potential to be used as a lignin source. It is composed of almost 40 lignin 20 glucan and 10 hemicellulose. In this work lignin in the sawdust was extracted with potassium hydroxide (KOH) in three different conditions: (1) 0.5 KOH for 10 minutes (2) 0.5 KOH for 30 minutes and (3) 1.5 KOH for 30 minutes. Then the lignin was precipitated by a two-step precipitation. The highest lignin content was extracted and recovered with a high purity of 96.1 from the 0.5 KOH for 10 minutes condition whereas the 1.5 KOH condition gave less lignin content. The ferric-reducing antioxidant power (FRAP) showed no significant values of all samples. The IC‚‚ of the 2 2-diphenyl-1-picrylhydrazyl (DPPH) assays showed that the lignin from the 1.5 KOH condition needed double compared to that of the other conditionsto neutralize DPPH for 50. The Fourier transform infrared spectroscopy results confirmed that the extracted lignin was mainly composed of guaiacyl and syringyl alcohol and the severity of the pretreatment affected the deformation of bonds in the lignin. Therefore this short (10 minutes) and low KOH (0.5) method could reduce the cost in biomass conversion.

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Item Type:	Article
AGROVOC Term:	Fabaceae
AGROVOC Term:	Caesalpinioideae
AGROVOC Term:	Extraction
AGROVOC Term:	Sawdust
AGROVOC Term:	Lignins
AGROVOC Term:	Glucans
AGROVOC Term:	Hemicellulose
AGROVOC Term:	Waste wood (conversion)
AGROVOC Term:	Antioxidants
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/10742

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