Evaluation of nutrient content in red kidney beans, amaranth leaves, sweet potato roots and carrots cultivated in Rwanda

Evaluation of nutrient content in red kidney beans, amaranth leaves, sweet potato roots and carrots cultivated in Rwanda

Author: 
Kambabazi, Marie-Rose
Publisher: 
Rural Outreach Programme (ROP)
Date published: 
2021
Record type: 
Responsibility: 
Okoth, MW, jt. author
Ngala, S, jt. author
Njue, L, jt. author
Vasanthakaalam, H, jt. author
Journal Title: 
African Journal of Food, Agriculture, Nutrition and Development
Source: 
African Journal of Food, Agriculture, Nutrition and Development, Vol 21, No. 4, May 2021, pp. 17801-17814
Abstract: 

No data exist on the nutrient composition of some important Rwandan staples. The aim of this study was to evaluate the nutrient content of red kidney beans, sweet potato roots, amaranth leaves and carrot roots. About 6 kg of each raw material were cleaned and conditioned prior to mechanical drying, ground and sieved [60-mesh] into flour and then subjected to quantitative analysis for proximate content, energy, calcium (Ca), iron (Fe), zinc (Zn), vitamin A and vitamin C. Proximate composition determination was done using Near Infrared Spectroscopy (NIRS), carbohydrates were determined by difference, energy was calculated, mineral analysis was done by Atomic Absorption Spectroscopy (AAS) and vitamin analysis was performed by High Performance Liquid Chromatography (HPLC) methods. The results showed that red kidney beans, sweet potato roots, amaranth leaves and carrots contain 21.48, 6.66, 29.46 and 13.8% of protein; 2.58, 1.68, 7.89 and 2.08% of fat; 60.86, 79.13, 19.29 and 57.38% of carbohydrate; 2.33, 2.68, 8.98 and 9.63% of fiber; 8.82, 8.74, 10.08 and 8.88% of moisture content; 3.94, 1.11, 24.30 and 5.16% of ash; 357.2, 363.7, 284.0, 322.9 kcal/100g of energy; and 146.4, 182.7, 26,290 and 1,247mg/kg of calcium, respectively. Red kidney beans, amaranth leaves and carrots contained8.54, 30.48, and 15.55 mg/kg of zinc; and 21.36, 219.1and 8.81 mg/kg of iron, respectively. Zinc and iron were, however, not detected in sweet potato samples analysed. Red kidney beans, sweet potato roots, amaranth leaves and carrot contained 768.0, 10,880, 399.4, and 6,413 IU/100g of vitamin A; and 2.67, 30.99, 330.3 and 6.76 mg/100g of vitamin C, respectively. In conclusion, the staples analysed contained appreciable amounts of nutrients and could be used to overcome malnutrition and allow dietary diversity. It could be recommended to prepare a Rwandan food composition database in order to improve awareness on local grown crops' quality.

Language: 
Country focus: 

CITATION: Kambabazi, Marie-Rose. Evaluation of nutrient content in red kidney beans, amaranth leaves, sweet potato roots and carrots cultivated in Rwanda . : Rural Outreach Programme (ROP) , 2021. African Journal of Food, Agriculture, Nutrition and Development, Vol 21, No. 4, May 2021, pp. 17801-17814 - Available at: http://library.au.int/evaluation-nutrient-content-red-kidney-beans-amaranth-leaves-sweet-potato-roots-and-carrots