| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Rosa canina | Leaf | -- | 50.0 | * | |
| Olea europaea | Pericarp | -- | -- | Rizk, A.F.M. and Al-Nowaihi, A.S., The Phytochemistry of the Horticultural Plants of Qatar, Scientific and Applied Research Centre, University of Qatar. | |
| Stevia rebaudiana | Leaf | -- | -- | Kinghorn, A. D. (Ed.) 2002. Medicinal and Aromatic Plants - Industrial Profiles. Stevia. The genus Stevia. Taylor & Francis. New York, NY. 211 pp. | |
| Malus domestica | Plant | -- | -- | J.S. Glasby Dict.Pls Containing 2ndary Metabolite. 1991. | |
| Lycopersicon esculentum | Fruit | -- | -- | * | |
| Rheum rhabarbarum | Pt | -- | -- | * | |
| Prunus persica | Fruit | -- | -- | * | |
| Prunus persica | Leaf | -- | -- | * | |
| Melilotus alba | Plant | -- | -- | * | |
| Euphorbia pulcherrima | Flower | -- | -- | * | |
| Humulus lupulus | Fruit | -- | -- | * | |
| Illicium verum | Plant | -- | -- | * | |
| Viscum album | Plant | -- | -- | * | |
| Vaccinium myrtillus | Leaf | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |