1. Department of Chemistry, Middle Tennessee State University, Murfreesboro, Tennessee 37132, United States
2. Methods and Application of Food Composition Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Services, United States Department of Agriculture, Beltsville, Maryland 20705-2350, United States
3. American Herbal Pharmacopoeia, PO Box 66809, Scotts Valley, California 95067, United States
4. Department of Chemistry and Biochemistry, Clippinger Laboratories, Ohio University, Athens, Ohio 45701, United States