Proximate nutrient composition of some wild edible medicinal plants from Uganda

Abstract

There are high levels of malnutrition especially among children in Africa. In Uganda, this is compounded by widespread food insecurity. There are various wild edible plant species in Uganda. However, little research has been carried out to document and validate the claims associated with their use. A study was, therefore, carried out to analyse the nutritional contents of six commonly used wild edible medicinal plant species from Nebbi district in Northwestern Uganda. These plants were Erythrococca bongensis, Grewia trichocarpa, Leptadenia hastata, Nymphaea lotus, Oxygonum sinuatum and Talinum portulacifolium. The plants were selected mainly because of their use as both food and medicine. All the selected plant species have documented medicinal uses among the local communities in Nebbi district where they are used. However, many of them are often neglected and underutilized, despite their potential therapeutic and nutritional benefits. The vitamin C, β-carotene, macronutrient, calcium, iron, magnesium, phosphorous and sodium compositions of the selected edible parts of the plant species were analysed. With the exception of Grewia trichocarpa fruits and Nymphaea lotus seeds, the leaves of Talinum portulacifolium had higher Fe (4.54±0.07 mg/100g), P (0.31±0.01 mg/100g), Mg (0.3±0.3 mg/100g), β-carotene (0.275±0.00 μg/100g) and crude ash (22.13±0.19%) contents than the rest of the plant species. The leaves of Leptadenia hastata had higher levels of vitamin C (17.93±2.01 mg/100g) than the leaves of other plant species. All the plant species analysed were richer in iron than the common cabbage Brassica oleracea var capitata. There were significant differences in the nutritional contents of the plant species analysed (p<0.05). However, the nutrient values of the plant extracts were generally much lower, providing a small percentage of Recommended Dietary Allowance or Recommended Nutrient Intakes (RNI) values. The vitamin C, β-carotene and other nutrient contents of most of the plant species analysed were generally comparable or even higher than those of the common cabbage in some instances. Consumption and conservation of these plant species should be encouraged by local authorities because they not only supplement the local staples with the much needed nutrients, but they could also have medicinal properties. Key words: Wild, edible, Medicinal plants, Nutrient, Food-security, food, underutilized, Uganda