Proximate Analysis And Heavy Metal Concentration of Solanum Tuberosum (L.) and Ipomea Batatas(L.) Lam Collected from Okokomaiko Market in Ojo Local Government Area in Lagos, Nigeria

Abstract

Ipomeabatat as and Solanumtuberosum are commonly eating in Nigeria because they are rich in mineral content and equally cheap to buy by average Nigerians. However, most of the soils where these products are planted are often affected by heavy metals due to human actions around the farms. Consequently, this study was undertaken to investigate the proximate, mineral and heavy metals contents in some Ipomeabatatas and Solanumtuberosum from market area in Ojo Local Government Area of Lagos state, Nigeria. The collections of tuber samples and the methods of analyses used are those specified in American Public Health Association (APHA), American Water Works Association (AWWA) and Water Environment Federation (WEF). The results showed that there was no significant difference (p>0.05) between Crude protein (CP), Crude fat (CF), Crude fibre (CFB), Ash, and Hydrocyanic acid found in Ipomeabatatas and Solanumtuberosum from the market. However, there was significant difference (P<0.05) in Moisture, Carbohydrate, Sugar, Carotenoid, and Ascorbic acid recorded in Ipomeabatatas and Solanumtuberosum. The values are (70.960 ± 0.163, 78.955± 0.106%), (23.985± 0.148, 16.675± 0.163%), (8.115 ±0.148, 1.245± 0.276%), (5.20±  0.890 ± 0.113%), and (41.61± 4.373, 19.310 ± 4.568%) respectively.More so, there were no significant difference (p>0.05) between Calcium (Ca), Manganese (Mn), Copper (Cu), Zinc (Zn), Chromium (Cr), and Cobalt (C), recorded in Ipomeabatatas and Solanumtuberosum from the market. All the values of heavy metal recorded were within the WHO permissible limit. On the contrary, there were significant difference (P<0.05) in Magnesium (Mg), Sodium (Na), Potassium (K), Iron (Pb), Phosphorus (P), recorded in Ipomeabatatas and Solanumtuberosum. The values are (81.92±0.93, 131.35 ±0.59mg/100g), (10.96 ±0.87, 323.18 ±2.94mg/100g), (1138.39± 6.37, 209.93 ±0.94mg/100g), (0.53 ±0.06, 4.0±S 0mg/100g), (167.95± 2.07, 210.14±1.02mg/100g). It can be concluded that the two plant species examined are very rich in nutrient however the heavy metal contents are within the acceptable limit but activities that may further increase their values should be discouraged to avoid bioaccumulation.