| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Terminalia bellirica | Stem Bark | -- | -- | Bajpai, N., Tiwari, J. S. 1994. A Note on the Phytochemical Investigation of Terminalia Genus. J. Indian Chem. Soc. 71 10: 643. | |
| Piper nigrum | Plant | -- | -- | Jeffery B. Harborne and H. Baxter, eds. 1983. Phytochemical Dictionary. A Handbook of Bioactive Compounds from Plants. Taylor & Frost, London. 791 pp. | |
| Piper nigrum | Leaf | -- | -- | * | |
| Piper nigrum | Stem | -- | 40.0 | * |