Greener Trends in Food Science and Nutrition
Vol. 1(1), pp. 01-10, 2018
Copyright ©2018, the copyright of this article is retained by the author(s)
Nutritional Significance of Cowpea Leaves for Human Consumption
*Enyiukwu DN, Amadioha AC, Ononuju CC
Department of Plant Health Management, Michael Okpara Universty of Agriculture, Umudike PMB 7267 Umuahia, Abia State, Nigeria.
Article No.: 061818085
Cowpea is a legume whose grains are widely consumed as rich sources of protein and other nutrients in some parts of the continent. Recent surveys have also shown that cowpea leaves are relished as vegetable in Southern and Eastern Africa as well as Middle belt areas of Nigeria. Protein, calorie and mineral deficiencies such as marasmus, kwashiorkor and anaemia are reported to characterize malnutrition in many parts of Africa. For instance, amongst the health benefits of cowpea leaves, low glycemic index carbohydrates and vegetable-derived nutrients are known to prevent or combat cancer, hypertension, stroke, diabetes, insomnia, osteomalacia, osteoporosis, anencephaly, rickets and could enhance cardiac health and metabolic wellbeing. However, in eastern Nigeria, consumption of cowpea as leafy vegetable is largely non-existent probably due to dearth of information on its nutrients composition and possible health benefits amongst other factors. As part of efforts to create awareness to stimulate and warrant its adoption, utilization and consumption as leafy vegetable in eastern Nigeria, this study aims to document the nutrient composition of cowpea leaves grown in the area; and to highlight the potential human health benefits attendant from consumption of these nutrients. The study was carried out in the University greenhouse, with cowpea variety IAR-48 grown in heat sterilized topsoil contained in 20 cm pots arranged in completely randomized design replicated four times. The whole experiment was repeated twice. At 8 weeks after planting, tender leaves of the crop were harvested from the mid section of the crop, enveloped and later used for nutrient analyses. Chemical and nutrient profiling of the cowpea leaves tissues were done based on analytical and standard spectrometric methods and was carried out in triplicate determinations. Findings from this study indicated that cowpea leaves contained protein (34.91%), low glycemic index carbohydrates (31.11 %), prebiotics (19.46 %), fat (5.42 %), iron (65.21 mg), calcium (1.62 g), phosphorus (0.56g), magnesium (1.66 g), potassium (13.445 g) and sodium (2.22 g). Based on literature, these amounts of nutrients were sufficient to offset most of the recommended daily intakes (RDIs) of these nutrients in human diets. Though the anti-nutrient factors were not conducted in this study, previous investigators have shown that cowpea leaves contain low amounts of anti-nutrient factors, hence, findings from this study therefore support the adoption, utilization and consumption of cowpea leaves as vegetable in eastern parts of Nigeria.
E-mail: enyidave2003 @ gmail. com
Cowpea, leafy vegetable, health benefits, protein, prebiotics, nutrients
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Afolabi, I.S., Akpokene, O.N., Fashola, D.V., Famakin, T.C. (2012): Comparative evaluation of the nutritional benefits of some underutilized plant leaves. J. Nat. Prod. Plant Res. 2 (2), 261-266.
Alemu, M., Asfew, Z., Woldu, Z., Fanta, B.A., Medvecky, B. (2016): Cowpea (Vigna unguiculata L. Walp..) landrace density in northern Ethiopia. Int. J. Biodiiver. Conserv. 8 (11), 217-309.
Amadi, J.E., Oso, B.A. (1996). Mycoflora of cowpea seeds (Vigna unguiculata L.) and their effects on seed nutrient contents and germination. Nig. J. of Science 30, 063-069.
Ancient-Mineral (2016): Magnesium -- Health benefits. www.ancient-minerals.com/magnesium-benefits/health...Accessed November, 21, 2016.
AOAC (Association of Organic and Analytical Chemist) (2000): Official Methods of Analysis International (17th Ed). Washington DC., USA.
Aveling, T. (2007): Cowpea Pathology Research. Pretoria South, Africa. Pp 001-007.
Awurum, A.N. (2000): Effect of planting date on the incidence and severity of some fungi diseases of cowpea in the humid tropics of Southeast Nigeria. Journal Sust. Agric. Environ 2 (3), 128-133.
Awurum, A.N., Enyiukwu, D.N. (2013): Evaluation of the seed-dressing potentials of phytochemicals from Carica papaya and Piper guineense on the germination of cowpea (Vigna unguiculata L. Walp) seeds and incidence of the seed-borne fungi. Continental J. Agric. Sci. 7 (1), 29-35.
Axe (2016): Ten powerful benefits of zinc including fighting cancer. http://draxe.com/zinc-benefits/...Accessed November 21, 2016.
Best Health Magazine (2016): Four reasons to eat low glycemic ndex foods. www.besthealthmag.ca/best-eats/healthy-eating/4-reasons-to-eat-low-gi-foods. Accessed November 28, 2006.
Boden, S.D. (2016): Calcium and Vitamin D requirements. www.spine-health.com/conditions/osteoporosis/calcium-and-vitamin-d--requirements. Accessed November 23, 2016.
Body Building (2016): Benefits of understanding and using low glycemic index foods. www.bodybuilding.com/fun/glycemic_benefits_index.html. Accessed November 28, 2016
Campos-Vega, R., Loarca-Pina, G., Oomah, B.D. (2010): Minor components of pulses and their potential impacts on human health. Food Research International 43, 461-482.
Chikwendu, J.N., Igbatim, A.C., Obizoba, I.C. (2014): Chemical composition of processed cowpea tender leaves and husks. International J. Sci. Research Publ. 4 (5), 001-005.
Davis, D.W., Oelke, E.A., Oplinger, E.S., Doll, J.D., Hanson, C.V., Putnam, D.H. (2012): Cowpea alternative field crops manual, Pp 1-9. www.hort.pordue.edu/newcrop/afcm/cowpea.html. Accessed July 13, 2012.
Dike, M.C. (2010): Proximate, phytochemical and nutritional composition of some fruits, seeds and leaves of some plant species in Umudike, Nigeria. ARPN J. Agric. Biol. Science 5 (1), 7-16.
Duke, J.A. (1983): Vigna unguiculata L. Walp. Ssp. unguiculata. Handbook of energy crops (Unpublished). www.hort.org/cowpea...Accessed October 8, 2016.
Enyiukwu, D.N., Awurum, A.N. (2013a).: Fungitoxic effects of Carica papaya and Piper guineense extracts against Colletotrichum destructivum in the glasshouse. Continental J. Agric. Sci. 7 (1), 23-28.
Enyiukwu, D.N., Awurum, A.N. (2013b). Fungitoxic principles and antifungal activity of extracts from Carica papaya and Piper guineense on Colletotrichum destructivum. Continental J. Biol. Sci. 6 (1), 29-36.
Glatter, R. (2014): Benefits of low glycemic approach to eating. www.forbes.com/sites/robertglatter/2014/03/17/benefits-of-low-glycemic-approach-to-eating. Accessed November 28, 2016.
Hallensleben, M, Polreich, S., Heller, J. and Maas, B. L. (2009). Assessment of th importance and utilization of cowpea as leafy vegetable by small scale farm households in Tanzania – East Africa. A paper at the international Conference on International Research on Food Security, Natural Resources Management and rural Development, Universiy of Hamburg, Tropentag, October 6-8, 2009.
Harvard, T.H. School of Public Health (2016): Health risks and diseases related to salt and sodium (The nutrition source). www.hsph.havard.edu/nutritionsource/salt-and-sodium-health-risks-and-diseases Accessed November 23, 2016.
Health Benefit Times (2016): Health benefits of cowpea leaves. www.healthbenefittimes.com/cowpea/cowpea/facts_health_benefits_and_nutrional_value… Accessed October 6, 2016.
FAO (Food and Agricultural Organisation of the United Nations) (International Year of Pulses) (2016). Nutritious seeds for a sustainable future. National Programme for Food Security (NPFS) Abuja, Nigeria, Pp 001-002.
Idris, S. (2011): Compositional studies of Telferia occidentalis leaves. American Journal of Chemistry 1 (2), 56-59.
Igbatim, C.A., Chikendu, J.N., Obizoba, I.C. (2014): Chemical and organoleptic potentials of soups based on cowpea leaves and husks. IOSR J. Environ. Sci. Toxicol. Food Technol. 8(11): 11-22.
Kayode, O.F., Okafor, J.N.C., Adeyoju, O.A., Etoamaihe, M.A., Ozumba, A.U. (2008): Nutrient composition and sensory evaluation of selected Nigeria traditional soups. Journal Ind. Research Tech. 2 (1), 51-55.
Mamiro, P.S., Mbwaga, A.M., Mamiro, D.P., Mwanri, A.M., Kinabo, J.L. (2011): Nutritional quality and utilization of local and improved cowpea varieties in some regions in Tanzania. African J. Food, Agric. Nutri. Devpt, 11 (1), 4490-4506.
Mohd, A.M., Idris, M.B., Adurasheed, A. (2016): Mineral composition and proximate analysis of Telferia occidentalis (Fluted pumpkin) leaves consumed in Kano metropolis, Northern Nigeria. American Chem. Science J. 10 (1), 001-004.
New York Times (2014). Sodium in diets: Nutrition, nutrition function and side effects. New York Times May 13, 2014. www.nytimes.com/health/guides;nutrition/sodium in diets/overview.html Accessed November 23, 2016.
Nielsen, S.S., Ohler, T.A., Mitchell, M.C. (1997): Cowpea leaves for human consumption: production, utilization and nutrient composition. In: Advances in Cowpea Research, Singh, B. B. (Eds), Ibadan, IITA, pp. 126-132.
Okonya, J. S. and Maas, B. L. (2014). Protein and iron composition of cowpea leaves : an evaluation of six cowpea varieties grown in eastern Africa. Afri. Journal of food, Agric. Nutri. 14(5): 2129-2140.
Okwu, D.E., Njoku, E.E. (2009): Chemical composition and in vitro antifungal activity screening of seed and leaf extracts from Afromonum melenguata and Monodora myristica against Sclerotium rolfsii of cowpea plant. Pest Technology 3 (1), 58 – 67.
Olayiwole, I.O., Folarami, F., Adebowale, A., Onabanjo, O.O., Sanni, S.A., Alabi, W.A.O. (2012): Nutritional composition and sensory qualities of cocoyam-based recipes enriched with cowpea flour. Journal Nutr. Food Sci. 2 (10), 170-177.
Organic Facts (2016a). Health Benefits of calcium in diets. www.organicfacts.net/health-benfits/minerals/calcium.html
Organic Facts (2016b). Health Benefits of phosphorus in diets. www.organicfacts.net/health-benfits/minerals/phosphorus.html
Organic Facts (2016c). 11 impressive benefits of potassium in diets. www.organicfacts.net/health-benfits/minerals/sodium.html
Rizkalla, S.W., Bellisle, F., Sharma, G. (2012): Health benefits of low glycemic index foods, such as pulses in diabetic patients and healthy patients. British J. Nutrition 88 Suppl. 3 S255-62 (PubMed).
SADAFF (South Africa Department of Agriculture, Forestry and Fisheries) (2013). Cowpea (Vigna unguiculata L. Walp.). Department of Agriculture, Forestry and Fisheries, Pretoria SA Pp 001-002.
Ware, M., and Carter, A (2018): Potassium: health benefits, recommended daily intake. Medical News Today (MNT). www.medicalnewstotay.com/potassium...Accessed January 22, 2018.
Whelton, P.K., He, J. (2014): Health effects of sodium and potassium in humans (NCBI). www.ncbi.nim.nih.gov/sodium-and-potassium...Accessed November 18, 2016.
Cite this Article: Enyiukwu DN, Amadioha AC, Ononuju CC (2018). Nutritional Significance of Cowpea Leaves for Human Consumption. Greener Trends in Food Science and Nutrition, 1(1): 01-10, http://doi.org/10.15580/GTFSN.2018.1.061818085.
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