Data Views Exclude Ubiquitous Chemicals Activities: 550 Chemicals w/Activities: 81 All Chemicals: 144 CSV Excel PDF Previous12345678 Show all rows. Paginate rows. Click on column headings to sort table by that column # Activity Chemical Part All Leaf Plant Root Root Essent. Oil Stem Pt Low PPM High PPM StdDev *Reference 24 24 VANILLIC-ACID Pt -- 4.0 * 0 WATER Stem 927000.0 950000.0 0.71 * 0 WATER Leaf -- 900000.0 0.46 * 77 77 ZINC Pt 1.0 46.0 * *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.