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Lignin as natural radical scavenger. Effect of the obtaining and purification processes on the antioxidant behaviour of lignin

Paper ID Volume ID Publish Year Pages File Format Full-Text
3519 173 2012 13 PDF Available
Title
Lignin as natural radical scavenger. Effect of the obtaining and purification processes on the antioxidant behaviour of lignin
Abstract

In the present work, the antioxidant activity of 14 lignin samples obtained from apple tree pruning was studied. Different solvents (water, soda–water 7.5% (w/w), ethanol–water 60:40 (v/v) and acetic acid–water 60:40 (v/v)) under different operation conditions were used in order to extract the lignin and different techniques (ultrafiltration, differential precipitation and lignin purification) were applied with the aim of improving the lignin properties. The obtained lignin samples were characterized by different analytical techniques evaluating their chemical structure (ATR-IR), thermal behaviour (TGA and DSC) and molecular weight (GPC). Further analyses (13C NMR and Folin–Ciocalteu method) were carried out in order to determine the purity and the total phenolics content present in the lignin samples. The antioxidant activity of the analyzed lignins was evaluated by the radical ABTS assay. The results revealed the high influence that the lignin obtaining process had on the lignin properties, determining its possible commercial application. Results also indicated that autohydrolysis, organosolv and some ultrafiltrated soda lignins showed antioxidant efficiency comparable with a powerful natural antioxidant, as catechin, and a commercial one, Trolox®.

► The effect of lignin isolation on its antioxidant capacity was studied. ► Several solvents and operation conditions were used for lignin obtaining. ► The purity of lignin had high influence on its antiradical behaviour. ► Ultrafiltration and differential precipitation improved lignin antioxidant power.

Keywords
Lignin; Biorefinery; Antioxidant capacity; Agricultural wastes; Ultrafiltration; Purification
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 67, 15 August 2012, Pages 173–185
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us