Nutrient composition of five varieties of commonly consumed Nigerian groundnut (<i>Arachis hypogaea</i> L.)

Abstract

The nutrient composition of the five major varieties of groundnut (<i>Arachis hypogaea</i> L.) commonly consumed in the south-western part of Nigeria was investigated. Raw dryshelled samples were analyzed for proximate (moisture, ash, protein, fat, fiber and carbohydrate), ‘vitamins’ (β-carotene, thiamine, niacin and tocopherol) and minerals (Na, K, Ca, P, Mg, Fe, Mn, Zn, Cu, Se, Co, Al, As, Cd and Pb). Results showed that the groundnuts had 4.12-9.26% moisture, 2.77-3.31% ash, 24.26-26.35% protein, 45.41-48.14% fat, 2.51-2.94% fiber and 15.90-17.75% carbohydrate. All the varieties analyzed showed β-carotene (63.32-65.35mg/100g), thiamin (0.73-0.98mg/100g), niacin (14.00-16.03mg/100g) and tocopherol (18.62-21.07mg/100g) activities; with boro red having significantly (P < 0.05) higher values in all but β-carotene. Heavy metals like Co, As, Cd and Pb were not detected in any of the samples and the other minerals vary with K> P> Mg> Ca> Mn> Cu> Na> Zn> Fe> Al> Se in most of the varieties. Boro red also had the highest elemental contents in most of the minerals analyzed. Thus, these groundnuts can be considered useful foodstuffs in minimizing proteinenergy malnutrition (PEM) and micronutrient deficiencies in Nigeria. However, the boro red variety is most recommended. The outcome of this research is a contribution to the food composition table.<br><br>Se ha investigado la composición en nutrientes de las cinco principales variedades de maní (<i>Arachis hypogaea</i> L.) de consumo habitual en la parte sur-occidental de Nigeria. A las muestras crudas con cáscara y secas se les analizó su composición proximal (humedad, ceniza, proteína, grasa, fibra e hidratos de carbono), vitaminas (β-caroteno, tiamina, niacina y tocoferol) y minerales (Na, K, Ca, P, Mg, Fe, Mn, Zn, Cu, Se, Co, Al, As, Cd y Pb). Los resultados mostraron que el maní tenía entre 4.12 - 9.26% de humedad, 2.77- 3.31% de cenizas, 24.26 - 26.35% de proteína, 45.41 - 48.14% de materia grasa, 2.51 - 2.94% de fibra y 15.90 -17.75% de carbohidratos. Todas las variedades analizadas contenían β-caroteno (63.32-65.35mg/100g), tiamina (0.73-0.98mg/100g), niacina (14.00-16.03mg/100g) y tocoferoles (18.62-21.07mg/100g), siendo la variedad <i>“Boro rojo”</i> la que contiene las cantidades significativamente más altas (P < 0.05), de casi todo. Los metales pesados como, Co, As, Cd y Pb no fueron detectados en ninguna de las muestras y los demás minerales varían en la mayoría de las variedades de la siguiente manera: K> P> Mg> Ca> Mn> Cu> Na> Zn> Fe> Al> Se. La variedad <i>“Boro rojo”</i> también tuvo el mayor contenido elemental en la mayoría de los minerales analizados. Por lo tanto, estos cacahuetes <i>de la variedad “Boro rojo”</i> es la más recomendable y pueden ser considerados unos productos alimenticios útiles para minimizar la malnutrición proteico-energética (MPE) y las deficiencias de micronutrientes en Nigeria. El resultado de esta investigación puede suponer una significativa contribución a la tabla de composición de alimentos

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