Leafy vegetables serve as the base of soups, a significant component of
Ghanaian food recipes. The varying climatic conditions across Ghana and
inefficient food distribution channels have resulted in the existence
of different food crops in different regions. Anecdotally, Ghanaians
generally believe that the consumption of Colocasia esculenta leaf
improves iron status. In this study, the levels of mineral nutrients:
calcium (Ca), iron (Fe), potassium (K), magnesium (Mg), manganese (Mn),
sodium (Na) and zinc (Zn) in the leaves of Hibiscus sabdariffa ,
Amaranthus spinosus , Hibiscus cannabinus , Solanum macrocapon and
Vigna unguiculata that are popularly used in food recipes in northern
Ghana (compose of the Northern, Upper East and Upper West Regions),
were compared with the levels in Colocasia esculenta leaf. The leafy
vegetables/greens consumed in northern Ghana were sourced from market
centres in the Northern and Upper East Regions (savannah zone);
Colocasia esculenta leaf was obtained from market centres in Ashanti
Region (forest zone). The leaves were shredded and air-dried for 7
days. The dried leaves were ground and analysed for the mineral
nutrients using Instrumental Neutron Activation Analysis. The Ca
content of Hibiscus sabdariffa was significantly higher than that of
Colocasia esculenta by 1.07-fold difference (p<0.05). However,
compared with Amaranthus spinosus, Hibiscus cannabinus, Solanum
macrocapon and Vigna unguiculata, the level of Ca in the Colocasia
esculenta leaf was 1.23- to 1.84-fold significantly higher (p<0.05).
The Fe level in the leafy vegetables commonly consumed in northern
Ghana was significantly lower (2.92- to 70.60-fold difference,
p<0.0001) compared with the Colocasia esculenta leaf. Significant
differences (p<0.05) were also observed in the levels of K, Mg and
Zn between the other greens studied and the Colocasia esculenta leaf.
The differences were between 1.17- to 1.48-fold (K), 1.08- to 1.54-fold
(Mg) and 1.15- to 2.59-fold (Zn). This study shows that the leafy
vegetables commonly consumed in northern Ghana contain lower levels of
the selected mineral nutrients analysed compared with those of
Colocasia esculenta leaf. There is a need to find alternative greens
that are available or could be cultivated in this part of the country