Variations in the composition and properties of the gum exuded by Acacia karroo Hayne in different African locations*

Abstract

The variation in chemical composition of 15 specimens of the gum exudate from Acacia karroo Hayne, obtained from four different African locations, has been investigated. The range of analytical values found (e.g., specific rotation + 36° to + 67°; uronic acid 10.3 to 18.1%; rhamnose 4 to 10%) reflect the well-known variability of this Acacia species. The major analytical difference concerns the unusually wide range of molecular weights observed, i.e., 1.5 × 105 to 48 × 105. The material of highest molecular weight, from trees infested with Cerambycid beetles, is consumed by bush-babies (Galagidae).