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Polyphenols in Acacia mangium and Acacia auriculiformis heartwood with reference to heart rot susceptibility

Citation

Barry, KM and Mihara, R and Davies, NW and Mitsunaga, T and Mohammed, CL, Polyphenols in Acacia mangium and Acacia auriculiformis heartwood with reference to heart rot susceptibility, Journal of Wood Science, 51, (6) pp. 615-621. ISSN 1435-0211 (2005) [Refereed Article]

DOI: doi:10.1007/s10086-005-0707-x

Abstract

The heartwood of Acacia mangium is vulnerable to heart rot and this is the first study to investigate the role of heartwood extractives in its susceptibility. Acacia auriculiformis was compared with A. mangium because it is rarely associated with heart rot. The heartwood extracts of both species were dominated by three flavonoids (2,3-trans-3,4′,7,8-tetrahydroxyflavanone, teracacidin, and 4′,7,8,-trihydroxyflavanone), which were purified and identified by nuclear magnetic resonance spectroscopy. The latter compound has not been previously reported in A. mangium and evidence for melacacidin is also newly reported. The mass spectrometric (MS) behavior of these compounds is given, for example teracacidin does not form molecular ions by either electrospray ionization or atmospheric-pressure chemical ionization. The nature of Acacia tannins was compared to quebracho tannin (composed of profisetinidins) using oxidative cleavage to enable MS detection but a negative reaction was obtained for both, which suggests the Acacia tannins may also be of the 5-deoxy proanthocyanidin type. The concentration of flavanones was less when A. mangium heartwood was decayed but the amount of proanthocyanidins was only slightly reduced and therefore these compounds may be more resistant to degradation by heart rot fungi. We found that the total phenol content of A. auriculiformis was about fivefold that of A. mangium, and, while preliminary, this provides evidence for a role played by phenolic extractives in heart rot resistance of these Acacia species. © The Japan Wood Research Society 2005.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Organic Chemistry
Research Field:Organic Chemistry not elsewhere classified
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood Plantations
Author:Barry, KM (Dr Karen Barry)
Author:Davies, NW (Associate Professor Noel Davies)
Author:Mohammed, CL (Associate Professor Caroline Mohammed)
ID Code:27443
Year Published:2005
Web of Science® Times Cited:10
Deposited By:Agricultural Science
Deposited On:2005-08-01
Last Modified:2007-10-17
Downloads:0

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