ABSTRACT

The exudate of Eucalyptus citriodora. (family) which was initially thought to be a gum was found to contain mainly tannins using 5% aqueous FeCI3. Such tannin containing exudates that issue from the trunks of Eucalyptus and other trees are referred to as “kino”. The exudate was collected from four identified trees throughout the investigation at a plantation behind the settlement. Laying Zomo, opposite the premises of the Nigerian College of Aviation Technology, Zaria The reagents that were used to establish the nature of the “kino” included 5% Ferric Chloride, 5% gelatin solution, bromine water, ferric ammonium citrate, formalin, sodium nitrite and lime. The reagents indicated that the “kino” contained mainly hydrolysable tannins whose main constituents are gallotannins and ellagic tannins but with traces of condensed tannins otherwise known as catechol tannins or catechins. It is worthy of note that inspite of the different periods of collection of the kino, the 1R spectral properties of the various samples were identical. This further indicated that the same spectrum of tannins as stated above were present. A solution of the kino in water was spotted against solutions of tannic and gallic acids on cellulose paper and chromatographed. The presence of free gallic acid in both the “kino” and tannic acid was confirmed. Free ellagic acid was, however, absent

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