Extractives yields, Stiasny values and polyflavanoid contents in barks from six Acacia species in Australia

Summary Bark samples of 30 individual trees were collected from six potentially important Acacia species; A. falciformis, A. implexa, A leucoclada, A. parramattensis, A. sylvestris and A. trachyphloia in New South Wales and Australian Capital Territory, Australia, and the yields, Stiasny values, and the polyflavanoid contents of the hot water extractives were determined. The bark samples from A. parramattensis gave the highest mean (50.2% of bark dry weight) of the extractives yield, while the lowest mean (21.9%) was obtained from barks of A. leucoclada. The two highest mean Stiasny values from A. falciformis (88.0%) and from A. parramattensis (82.8%) were not significantly different. The highest mean polyflavanoid content from A. parramattensis (41.7%) was significantly different from others. The bark quality of A. parramattensis for wood adhesives would be comparable to that of A. mearnsii provenances in New South Wales, Australia.