Abstract
The antioxidant activities, total phenols and antifungal activities of 35 extracts samples from 15 species of Malaysian timber were investigated. The methanol extracts from Mangifera indica heartwood were found to have superior antioxidant activity with an EC50 value of 4.71±0.89 μg/ml. Antioxidant activities correlated with total phenols contents. The methanol extracts from Neobalanocarpus heimii bark and Cinnamomum porrectum heartwood showed moderate antifungal activity against a brown-rot fungus, Gloeophyllum trabeum. The methanol extracts from Neobalanocarpus heimii bark and Endospermum malaccense inner wood showed the highest antifungal activity against a white-rot fungus, Pycnoporus sanguineus, at a minimum effective amount of 100 μg. The activities of these extracts were equal to the activity of the positive control, glycyrrhizic acid dipotassium salt, suggesting that they have great potential as a source of fungistats.
Zusammenfassung
Untersucht wurden die antioxidative Wirksamkeit, der gesamte Phenolgehalt sowie die Pilz hemmende Wirksamkeit von 35 Extraktstoffproben aus 15 verschiedenen malaysischen Holzarten. Mit einem EC50 Wert von 4,71±0,89 μg/ml hatten die Methanolextraktstoffe des Mangifera indica Kernholzes die höchste antioxidative Wirkung. Die antioxidative Wirksamkeit korrelierte mit dem Gesamtgehalt an Phenolen. Die Methanolextraktstoffe der Neobalanocarpus heimii Rinde und des Cinnamomum porrectum Kernholzes ergaben eine moderate Pilz hemmende Wirkung gegen den Braunfäulepilz Gloeophyllum trabeum. Bei einer Mindestmenge von 100 μg wiesen die Methanolextraktstoffe der Neobalanocarpus heimii Rinde und des Endospermum malaccense Kernholzes gegenüber dem Weißfäulepilz Pycnoporus sanguineus die höchste Pilz hemmende Wirkung auf. Die Wirksamkeit dieser Extraktstoffe entsprach derjenigen der Kontrollprobe Glycyrrhizinsäure-Dikaliumsalz. Dies weist auf ihr großes Potential als fungizide Mittel hin.
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Acknowledgements
We would like to thank Prof. Darah Ibrahim of the School of Biological Science, USM and Dr. Salmiah Ujang of FRIM for the fungal strains, the Kedah Forestry Department for identifying the wood, and Guar sawmills for providing timber samples.
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Kawamura, F., Ramle, S.F.M., Sulaiman, O. et al. Antioxidant and antifungal activities of extracts from 15 selected hardwood species of Malaysian timber. Eur. J. Wood Prod. 69, 207–212 (2011). https://doi.org/10.1007/s00107-010-0413-2
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DOI: https://doi.org/10.1007/s00107-010-0413-2