Data Views Exclude Ubiquitous Chemicals Activities: 125 Chemicals w/Activities: 21 All Chemicals: 42 CSV Excel PDF Previous123 Show all rows. Paginate rows. Click on column headings to sort table by that column # Activity Chemical Part All Bark Fruit Gum Heart Wood Leaf Plant Seed Stem Bark Low PPM High PPM StdDev *Reference 35 35 TANNIN Leaf -- -- * 35 35 TANNIN Bark -- -- * *Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.