Invasive Species Compendium

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Abstract

Characteristics of methanol extractives from Chengal wood and their antifungal properties.

Abstract

Chengal (Neobalanocarpus heimii) is a tropical wood with great durability. To clarify the antifungal wood components, wood meals of chengal were extracted with n-hexane, ether, and methanol, successively. The yields of extractives were 1.3, 14.8 and 13.5%, respectively. From the results of antifungal activity tests, the methanol extractives were shown to have the greatest antifungal activity among these extractives. The methanol extractives were fractionated by column chromatography using sephadex LH-20, and 6 fractions were obtained. After examination of their antifungal activities, Fraction No. 3 was shown to have the greatest antifungal activity among the 6 fractions. This fraction contained a relatively large amount of tannin. It gave gallic acid, ellagic acid, and glucose after acid-hydrolysis. It was presumed that the antifungal wood component of chengal is mainly hydrolysable tannin.