1. The Hormel Institute; University of Minnesota; 801 16th Ave NE Austin MN 55912 USA
2. MOE Key Laboratory for Analytical Science of Food Safety and Biology; College of Chemistry; Fuzhou University; Fuzhou 350116 P. R. China
3. Laboratory of Molecular Imaging and Nanomedicine (LOMIN); National Institute of Biomedical Imaging and Bioengineering (NIBIB); National Institutes of Health (NIH); Bethesda MD 20892 USA