Ref ID: 9625
Ref Type: Journal
Authors: Barry, K. M., Davies, N. W., Mohammed, C. L., and Beadle, C. L.
Pub Date: 2002
Journal Name: Holzforschung
Volume: 57
Issue: 3
Start Page: 230
End Page: 236
ISBN/ISSN:
Keywords: Acacia/colour/damage/forestry/melanoxylon/product/sawlog/solid/stain/Tasmania/wood/report/staining/Acacia melanoxylon/cutting/causal/mechanism/development/fungi/species/pH/phenol/composition/sample/mass spectrometry/data/experiment/oxygen/characteristic/chemical/cut/harvest
Abstract: This is the first report of post harvest wood staining in blackwood (Acacia melanoxylon R. Br). In Tasmanian sawmills, an orangebrown stain commonly occurs upon cutting fresh blackwood. An investigation of the causal mechanism of stain development was completed using fresh flitches and stockpiled logs. Some fungi and bacteria were isolated from stained and unstained blackwood, but no species was consistently present in stained wood alone. Wood pH did not vary between stained and unstained wood, but there was some evidence of alterations in phenol composition. Blackwood extracts were analysed by HPLC and a minor phenolic compound was detected that was consistently found in stained samples and rarely in unstained. UV spectra indicated that this compound may be a quinone, but mass spectrometry data was inconclusive. Experiments with blackwood extracts showed that addition of oxygen (by means of H2O2 treatment) increased absorbance in the brown wavelengths characteristic of stain. This supports the assumption that the stain is an oxidative chemical stain, as it develops quite rapidly from cut surfaces.
Notes: Entered by Maria Cherry (27/11/2001)
Reprint: Not in File
Program: SPF Resource Protection
Project: C5
Deliverable: C5-3
Confidentiality: Public
Availability: Online
Report: Annual Report 2001/2; Annual Report 2002/3
Type: Article
Address: Karren.Barry@csiro.au