Levels Of Essential And Non-essential Metals In Ginger (zingiber Officinale) Cultivated In Ethiopia

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Ginger (Zingiber officinale Roscoe) is one of the most widely used spices that containrnseveral interesting bioactive constituents. Ginger has numerous health benefits and hasrnbeen reported to possess antioxidant, antiseptic, anticarcinogenic, and antifungal,rnproperties. In the present study, the level of essential (Ca, Mg, Fe, Zn, Cu, Co, Cr, Mn, andrnNi) and non-essential elements (Cd and Pb) in ginger cultivated in Ethiopia (particularly inrnTepi, Bombae, Hadaro and Ilubabur) and the soil where it has grown were determined byrnflame atomic absorption spectrometry. The optimized wet digestion procedure wasrnevaluated using standard addition (spiking) method and an acceptable percentage recoveryrnwas obtained 93-106 and 93-107 for the metals in ginger and soil samples respectivelyrnexcept chromium in ginger. 0.5 g of oven dried ginger sample was digested using 3 mL ofrnHNO3 and 1 mL of HClO4 at 210 oC for 3 h and 0.5 g dried soil sample was digested withrnreagent mixture of 6 mL aqua-regia and 1.5 mL H2O2 at 270 oC for 3 h. The mean metalrnconcentration ( g/g dry weight basis) ranges in ginger and soil samples respectively are:rnCa (2001-2543, 1773-3583), Mg (2700-4094, 1457-2442), Fe (41.8- 89.0, 21701-46950),rnZn (38.5-55.2, 255-412), Cu (1.1-4.8, 3.8-33.9), Co (2.0-7.6, 48.5-159), Cr (6.0-10.8, 110-rn163), Mn (184-401, 1756-6465), Ni (5.6-8.4, 14.1-79.3) and Cd (0.38-0.97, 0.24-1.1).rnHowever, Pb was not detected in both ginger and soil samples. A statistical analysis ofrnvariance (ANOVA) at 95% confidence level was used to test whether the variationrnbetween the mineral content of four sample means were significant or not. The Pearsonrncorrelation was used to predict the dependence of metal levels on one another.rnKey words: Ginger (Zingiber officinale), Essential elements, Non-essential elements,rnFlame Atomic absorption spectrophotometer.

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Levels Of Essential And Non-essential Metals In Ginger (zingiber Officinale) Cultivated In Ethiopia

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