Determination of phytochemicals and some heavy metals in leaves of some edible vegetables marketed south eastern Nigeria
Ndulaka JC, Eke Ugorji Iheanacho, Onuh CF
The heavy metal content of edible vegetables has been studied. Heavy metal toxicity enters into the human food chain through certain food stuffs. Two different vegetables (Telfairia occidentalis and Talinum triangulare) were purchased in two different markets in Aba and were analyzed for their heavy metal contents using Atomic Absorption Spectrophotometer (AAS). Iron (Fe) levels were the highest followed by Zinc (Zn) whereas Lead (Pb) and Cadmium (Cd) were not detected by our analytical method. The concentration of Iron (Fe) in T. occidentalis sampled at new market (357 ± 0.17mg/kg), T. occidentalis sampled at umungasi market (419 ± 0.14mg/kg), T. triangulare sampled at new market (388 ± 0.02mg/kg) and T. triangulare sampled at umungasi market (342 ± 0.25mg/kg) while Zn has (76.1 ± 0.02mg/kg) and (115 ± 0.44mg/kg) in T. occidentalis sampled at new market and umungasi market. And (266 ± 0.77mg/kg) and (58.8 ± 0.26mg/kg) in T. triangulare sampled at new market and umungasi market respectively. The result showed that Zn in vegetables were above the recommended maximum level. Phytochemical studies indicated Alkaloids, flavonoids, and saponins in the vegetable sampled while tannins were only detected in T. triangulare.