1. Faculty of Agriculture, Food and Natural Resources, University of Sydney, NSW 2006, Australia.
2. Department of Chemistry and Biomolecular Sciences, Macquarie University, NSW 2109, Australia.
3. Food Science Australia, North Ryde, NSW 1670, Australia.
4. Plant Breeding Institute, University of Sydney, Camden, NSW 2570, Australia.
5. Corresponding author. Fax: +61-2-9351 2945. E-mail: l.copeland@usyd.edu.au