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Article

Organosolv Ethanol Lignin from Hybrid Poplar as a Radical Scavenger: Relationship between Lignin Structure, Extraction Conditions, and Antioxidant Activity

Xuejun Pan,* John F. Kadla, Katsunobu Ehara, Neil Gilkes, and Jack N. Saddler

Department of Wood Science, University of British Columbia, 2424 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada

J. Agric. Food Chem., 2006, 54 (16), pp 5806–5813

DOI: 10.1021/jf0605392

Publication Date (Web): July 7, 2006

Corresponding author. Phone: 604-822-6775. Fax: 604-822-9104. E-mail: xuepan@forestry.ubc.ca.

Abstract

Twenty-one organosolv ethanol lignin samples were prepared from hybrid poplar (Populus nigra × P. maximowiczii) under varied conditions with an experimental matrix designed using response surface methodology (RSM). The lignin preparations were evaluated as potential antioxidants. Results indicated that the lignins with more phenolic hydroxyl groups, less aliphatic hydroxyl groups, low molecular weight, and narrow polydispersity showed high antioxidant activity. Processing conditions affected the functional groups and molecular weight of the extracted organosolv ethanol lignins, and consequently influenced the antioxidant activity of the lignins. In general, the lignins prepared at elevated temperature, longer reaction time, increased catalyst, and diluted ethanol showed high antioxidant activity. Regression models were developed to enable the quantitative prediction of lignin characteristics and antioxidant activity based on the processing conditions.

Keywords: Antioxidant; biorefining; ethanol; free radical; organosolv ethanol lignin

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Published In Issue August 09, 2006
Received for review February 23, 2006. Revised manuscript received May 23, 2006. Accepted May 26, 2006. The support of the Natural Sciences and Engineering Research Council of Canada, Natural Resources Canada, and BIOCAP Canada is gratefully acknowledged.

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Article

Organosolv Ethanol Lignin from Hybrid Poplar as a Radical Scavenger: Relationship between Lignin Structure, Extraction Conditions, and Antioxidant Activity

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Recommend & Share

Related Content

Toward a Better Understanding of the Lignin Isolation Process from Wood

Extraction and Isolation of Lignin for Utilization as a Standard to Determine Lignin Concentration Using the Acetyl Bromide Spectrophotometric Method

Inhomogeneities in the Chemical Structure of Sugarcane Bagasse Lignin

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