1. Department of Food Science, University of Arkansas, 2650 North Young Avenue, Fayetteville, Arkansas 72704, Arkansas Statewide Mass Spectrometry Facility, University of Arkansas, Fayetteville, Arkansas 72701, Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 115 Plant Sciences Building, Fayetteville, Arkansas 72701, and Department of Agriculture, University of Arkansas at Pine Bluff, 1200 North University Drive, Pine Bluff, Arkansas 71601