Heavy Metal Contents of St. John's wort (Hypericum perforatum L.) Growing in Northern Turkey

摘要

Hypericum perforatum L. plants representing a total of 35 wild populations were collected from Black Sea region of Turkey at flowering stage and subsequently assayed for some heavy metal contents, namely Cu, Mn, Fe, Zn and Pb. The results of chemicalanalysis of plant samples revealed that total individual plant contents in these wild populations were 1.81-10.09 mug Cu g-'mean:6.34), 197.88-9.10 mug Mn g~(-1) (mean:39.26), 2990.21-54.16 mug Fe g~(-1) (mean:434.34), 181.60-12.91 mug Zn g~(-1) (mean:68.31) and 124.76-12.04 mug Pb g~(-1) (mean:47.51), respectively. According to the results of variance analysis, heavy metal contents of H. perforatum plants varied with sites to a large scale and this variation was found to be significant statistically.