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Role of Eucalyptus globulus wound wood extractives: evidence of superoxide dismutase-like activity

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Eyles, A and Davies, NW and Mitsunaga, T and Mihara, R and Mohammed, CL (2004) Role of Eucalyptus globulus wound wood extractives: evidence of superoxide dismutase-like activity. Forest Pathology, 34 (4). pp. 225-232. ISSN 1437–4781

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Abstract

Superoxide dismutase-like activity of crude Eucalyptus globulus extracts obtained from new wound wood was measured using the water-soluble tetrazolium salt (WST)-1 assay. This in vitro assay determined the activity of superoxide radicals scavenging in a xanthine oxidase system. The 50% inhibition (IC50) of formazan formation was estimated for fractionated samples and purified compounds isolated from the crude wound wood extract, i.e. engelitin and pedunculagin. Standards of gallic acid and pentagalloyl glucose were also measured. Fraction II as well as the compounds pentagalloyl glucose and pedunculagin showed the highest levels of antioxidant activity. Subsequent analysis of fraction II by high-performance liquid chromatography (HPLC) coupled with negative ion electrospray mass spectrometry revealed the fraction to be dominated by hydrolysable tannins including pedunculagin, di-, tri- and tetragalloylglucoses. These preliminary results provide some evidence for an antioxidant role of secondary metabolites in tree wound repair and defence.

Item Type: Article
Journal or Publication Title: Forest Pathology
Page Range: pp. 225-232
ISSN: 1437–4781
Identification Number - DOI: 10.1111/j.1439-0329.2004.00361.x
Additional Information: The definitive version is available at www.blackwell-synergy.com
Date Deposited: 05 May 2008 05:13
Last Modified: 18 Nov 2014 03:39
URI: http://eprints.utas.edu.au/id/eprint/6313
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