Determination of the elemental composition of Mentha arvenis, Trigonella foenum-graecum L., and Cinnamomum tamala using instrumental neutron activation analysis technique

Mentha arvenis (Mint), Trigonella foenum-graecum L. (Indian bay leaf), and Cinnamomum tamala (fenugreek) were studied for trace elements using instrumental neutron activation analysis (INAA). Highest concentrations of Mn, Na and were quantified in Mint, Ca and Cl in bay leaves while fenugreek was found to be rich in Al, Co, Cr, Fe, Mg, Rb, Sc and Sr. K/Na ratios of greater than 1 predict the suitability of use of these herbs by hypertensive subjects. When compared with the recommended dietary allowance for an adult it was seen that most of the measured elements are essential in our daily diet and therefore these herbs have nutrient value. The results obtained were also compared with the literature values. Toxic elements (As, Hg, Sb and Se) were found to be below the very low detection limits, for INAA.