1. Research chemists, Mycotoxin and Biomaterials Processing Research Units, National Center for Agricultural Utilization Research, Agricultural Research Service, U. S. Department of Agriculture, 1815 N. University St., Peoria, IL 61604. Mention of trademark or proprietary products does not constitute a guarantee or warranty by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may also be suitable.
2. Corresponding author. E-mail: dombrink@mail.ncaur.usda.gov Phone: 309/681-6254. Fax: 309/681-6686.