Evaluation of the antioxidant activities of different bio-oils and their phenolic distilled fractions for wood preservation

Published Date
May 2016, Vol.110:121–128, doi:10.1016/j.ibiod.2016.03.015

Author 

• El Barbary Hassan ^a,,
• Emad M. El-Giar ^b
• Philip Steele ^a

• aDepartment of Sustainable Bioproducts, Mississippi State University, Box 9820 Mississippi State, MS 39762, USA
• bSchool of Sciences, University of Louisiana at Monroe, Monroe, LA 71209, USA

Received 18 July 2015. Revised 13 March 2016. Accepted 13 March 2016. Available online 24 March 2016. 

Highlights

• Phenolic compounds are primarily responsible for the bio-oil antioxidant activity.
• •
  Phenolic compounds with high boiling point possess higher antioxidant activities.
• •
  Guaiacol and its derivatives are the most effective antioxidant phenolic compounds.

Abstract

This research investigated the antioxidant activities of raw bio-oils produced from pine and oak wood species. The study also included the effect of the pyrolysis parameters on the properties of the bio-oils produced. In addition to raw bio-oils, phenolic fractions were further isolated from the bio-oils at two different temperature ranges (180–220 °C and 220–270 °C) by using spinning band distillation columns. The antioxidant activities of raw bio-oils and phenolic fractions were evaluated using the Trolox equivalent antioxidant capacity (TEAC) assay. The concentrations of phenolic compounds were determined by gas chromatography/mass spectrometry (GC/MS). The results of the assay showed that the antioxidant activities of the phenolic fractions are much higher than those of the parent bio-oils. GC/MS analysis results showed that o-guaiacol and its derivatives (4-methylguaiacol, 4-ethylguaiacol, and 4-propylguiacol), phenol, 3-methylphenol, 2,3-dimethylphenols, 3-ethylphenol, and eugenol are the most influential phenolic compounds on the antioxidant activity of the bio-oils and their distilled fractions.

Keywords

Bio-oil

Wood preservation

Antioxidant activity

Phenolic compounds

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• ∗ 
  Corresponding author.
  
  

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