Abstract
This research analyzed the effect of processing (boiling and roasting) on the proximate, antinutrient, and mineral composition of Vigna subterranea seeds. The proximate composition analysis showed significant difference (P<0.05) between the levels of crude lipid, crude fiber, gross energy, carbohydrate, and moisture content in the raw and processed V. subterranea. However, no significant difference (P<0.05) was observed in protein content of processed V. subterranea as compared to the raw seeds. Analyses of antinutrient composition show that processing significantly reduced the levels of oxalate, tannins, phytate, trypsin inhibitor, and hydrogen cyanide contents of V. subterranea. While magnesium, potassium, and phosphorus were the most abundant macrominerals in V. subterranea, zinc was the most abundant micromineral. Correlation analysis revealed that the levels of crude protein, ash, moisture, and lipid were negatively affected by phytate, tannins, and oxalate. The results, therefore, suggest that processing significantly lowered the levels of antinutrients in V. subterranea, thereby making it safer for consumption.
Highlights
Vigna subterranea L. (Bambara groundnut) is a pulse with subterranea fruit set and is cultivated by small farm holders over much of semiarid Africa [1]
The Bambara groundnuts (Vigna subterranea) seeds were obtained from local farmers in Fadan Ninzo, Randa, and Gwantu villages, in Sanga Local Government Area of Kaduna South, Kaduna State, North-West Nigeria
Boiling and roasting reduced the antinutritional properties of Bambara groundnuts below the permissible limits
Summary
Vigna subterranea L. (Bambara groundnut) is a pulse with subterranea fruit set and is cultivated by small farm holders over much of semiarid Africa [1]. (Bambara groundnut) is a pulse with subterranea fruit set and is cultivated by small farm holders over much of semiarid Africa [1]. It is a legume species of African origin [2] and is widespread south of the Sahara [3]. Legumes serve as a source of protein to a large proportion of the population in poor countries of the world by being the least expensive and stored and a transported nonprocessed protein source for rural and urban dwellers [4]. The high carbohydrate (65%) and relatively high protein (18%) content of V. subterranea make it a complete food [5]. It is necessary that their levels of consumption, which are already too low in a number of developing countries, be increased [2]
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