Data Views Exclude Ubiquitous Chemicals Activities: 231 Chemicals w/Activities: 13 All Chemicals: 22 CSV Excel PDF Previous12 Show all rows. Paginate rows. Click on column headings to sort table by that column # Activity Chemical Part All Leaf Plant Stem Low PPM High PPM StdDev *Reference 31 31 THIAMIN Leaf 0.7 19.0 2.23 * 0 WATER Leaf 920000.0 932000.0 0.62 * *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.