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4′,5′-Dihydroxy-epiisocatalponol, a new naphthoquinone from Tectona grandis L. f. heartwood, and fungicidal activity

Author:
Niamké, Florence Bobelé, Amusant, Nadine, Stien, Didier, Chaix, Gilles, Lozano, Yves, Kadio, Adjumane Aimé, Lemenager, Nicolas, Goh, Doreen, Adima, Augustin Amissa, Kati-Coulibaly, Séraphin, Jay-Allemand, Christian
Source:
International biodeterioration & biodegradation 2012 v.74 pp. 93-98
ISSN:
0964-8305
Subject:
Antrodia, Coriolus versicolor, Tectona grandis, antifungal properties, bioassays, chemical structure, decay resistance, durability, fungi, fungicides, heartwood, nuclear magnetic resonance spectroscopy, virulence, wood
Abstract:
A new naphthoquinone derivative was isolated from the heartwood of the teak stem. The chemical structure of this new compound, 4′,5′-dihydroxy-epiisocatalponol, was determined using 1-D and 2-D nuclear magnetic resonance experiments, vibrational circular dichroism, HRMS, and optical rotation. We showed that this new naphthoquinone derivative plays a key role in the variability of decay resistance in teak wood. A high negative correlation was found between its concentration and the mass losses of the wood samples after exposure to the brown rot Antrodia sp., the fungus that is the most virulent against teak (R = −0.9; ρ < 0.0001). In-vitro bioassays allowed us to demonstrate that 4′,5′-dihydroxy-epiisocatalponol acted as a fungicide against Trametes versicolor (white rot) at 58 mg ml⁻¹ (0.22 mM). Overall, our results demonstrated that the concentration of 4′,5′-dihydroxy-epiisocatalponol could be used as a new tool to evaluate teak wood durability.
Agid:
874655