Data Views Exclude Ubiquitous Chemicals Activities: 451 Chemicals w/Activities: 55 All Chemicals: 101 CSV Excel PDF Previous123456 Show all rows. Paginate rows. Click on column headings to sort table by that column # Activity Chemical Part All Flower Fruit Leaf Plant Pollen Or Spore Seed Low PPM High PPM StdDev *Reference 22 22 ISOQUERCITRIN Leaf -- -- * *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.