Study on the content of some metals in soil by XRF method and evaluating their effect on the total phenolic and flavonoid content of methanol extracts from two medicinal plants in An Giang Province

Several metals in soil affect the production of secondary metabolites medicinal plants. In this study, we have determined concentrations K, Mn, Fe, Zn, Cu soils collected at Tinh Bien, Tri Ton, Thoai Son, and Cam Mountain areas An Giang province by X-Ray Fluorescence Spectroscopy (XRF). We simultaneously evaluated total phenolic flavonoid content methanol extracts from Solanum torvum (Sw.) leaves Zingiber zerumbet (L.) rhizomes harvested Bien Mountain. The results showed that reached highest values particle size 0.25 mm among three sizes: mm, 1 2 mm. Whereas, metal contents two sampling depths 0-15 cm 15-30 were similar. K are higher than 1.18 times 1.70 times; however, Mn is lower 2.16 times, 1.64 1.43 times. Thereby, it can be seen concentration may contribute to increasing about 1.8 with sample, 2.5 for sample compared Meanwhile, did not these plants