Determination and Multivariate Analysis of Mineral Elements in the Medicinal Hoelen Mushroom, Wolfiporia extensa (Agaricomycetes), from China

Concentrations of 11 elements (As, Ba, Cd, Cu, Fe, Mn, Ni, Pb, Se, Sr, and Zn) from the medicinal and edible mushroom Wolfiporia extensa were determined using atomic fluorescence spectrometry (for As and Se) and inductively coupled plasma atomic emission spectrometry (for Ba, Cd, Cu, Fe, Mn, Ni, Pb, Sr, and Zn). All the samples were collected from 6 regions of Yuxi in Yunnan Province in the southwest of China and were digested with concentrated nitric acid and hydrogen peroxide in a microwave system. The recovery rates of standard addition ranged from 98.24% to 111.8%; the correlation coefficients were all above 0.999. The amounts of As (0.009-0.41 mu g.g(-1) dry weight [dw]), Cd (0-0.266 mu g.g(-1) dw), and Pb (0-2.6 mu g.g(-1) dw) were below the permissible limits in food that are promulgated by the World Health Organization. All the element concentrations determined in this study were proved at the common level. The result of principal component analysis indicated that 5 principal components were extracted from 11 elements, which revealed 74.7% of all variable information. The results of cluster analysis mainly showed the presence of 3 metal groups.