Impact of Sun Drying on the Nutritive and Antioxidant Properties of Five Leafy Vegetables Consumed in Northern Côte d 'Ivoire
Keywords:
Leafy vegetables, sun drying, nutritional value, antioxidant propertiesAbstract
Leafy vegetables are highly perishable in nature and their preservation is very important. Indeed, dehydration is a simple method of preservation of green leafy vegetables. The aim of this study was to evaluate the impact of sun drying on nutritional value and antioxidant properties of five leafy vegetables (Hibiscus sabdariffa, Amaranthus hybridus, Adansonia digitata, Vigna unguiculata and Ceiba pentandra) consumed in Northern Côte d'Ivoire. The selected leafy vegetables were subjected to sun drying for 1, 2 and 3 days and the physicochemical properties were determined using standard methods. The proximate analysis showed the following results after 3 days of sun-drying: moisture (4.62-8.36%), ash (8.69-24.85%), proteins (7.63-11.51%) and fibres (13.11-32.19%). The residual contents of minerals after 3 days of sun dried were: calcium (387.17- 949.88 mg/100g), magnesium (255.71- 738.79 mg/100g), phosphorus (288.26-727.68 mg/100g), potassium (661.20-1833.83 mg/100g), iron (73.62-212.53 mg/100g), zinc (22.8-38.62 mg/100g). It was also observed a decrease of vitamin C and carotenoids contents with losses estimated to 89-37-97.5% and 69.82-89.03%, respectively after 3 days of sun drying. Contrary to the registered losses, polyphenols content increased with antioxidant activity ranged from 55 to 75%. The high nutrient levels of the dried leafy vegetables make them good sources of food for malnourish children and target population. Dehydrated green leafy vegetable powder could be used in many traditional as well as commercial products for added value in order to overcome the health related problems.
References
Okigo B.N., Fruits and Vegetables Production and Extension Services in Africa, Acta Horticultural, Vol. 123,
pp 23-37, 1983.
Idowu, O., Effects of Drying Technique on some Vegetable Leaves, Journal of Science and Technology, University of Lagos. Nigeria, Vol. 2, no. 2, pp. 80-81, 2008.
PROTA. Ressources vegetales de l’Afrique tropicale. Grubben G.J.H. et Denton O.A. (eds). Fondation PROTA / Backhuys Publishers / CTA, Wageningen, Vol. 2: Legumes, pp. 737, 2004.
Fondio, L., Kouame, C., N’zi, J.C., Mahyao, A., Agbo, E., Djidji A.H., Survey of indigenous leafy vegetable in the urban and peri-urban areas of Cote d’Ivoire. Acta Horticultural, Vol. 752, pp. 287-289, 2007.
Soro, L.C., Atchibri, L.O., Kouadio, K.K., Kouame, C., Evaluation de la composition nutritionnelle des légumes-feuilles. Journal of Applied Bioscience, Vol. 51, pp. 3567– 3573, 2012.
Chavasit, V., Pisaphab, R., Sungpuag, P., Jittinandana, S., Wasantwisut, E., Changes in β-carotene and vitamin A contents of vitamin A-rich foods in Thailand during preservation and storage. Journal of Food Science, Vol. 67, pp 375-379, 2002.
Bukola, O. Bolaji, Tajudeen, M.A. Olayanju, Taiwo, O. Falade. Performance evolution of a solar wind ventilated cabinet dryer. West Indian journal of engineering, Vol. 33, pp.12-18, 2011.
Chinma, C.E., Igyor, M.A., Micro-nutriments and anti-nutritional content of select tropical vegetables grown in South-East, Nigeria. Nigeria Food Journal, Vol. 25, pp. 111-115, 2007.
AOAC. Official methods of analysis. Association of Official Analytical Chemists Ed., Washington DC. 684 p, 1990.
FAO. Food energy-methods of analysis and conversion factors. FAO Ed, Rome. 97 p, 2002.
Day, R.A., Underwood, A.L., Quantitative analysis 5th ed. Prentice Hall. 701p, 1986.
Latta, M., Eskin, M., Simple method for phytate determination. Journal of Agriculture Food Chemistry, Vol. 28, pp. 1313-1315, 1980.
Pongracz, G., Weiser, H., Matzinger D., Tocopherols- Antioxydant. Fat Science and Technology, Vol. 97, pp. 90-104, 1971.
Rodriguez-Amaya D.B., A guide to carotenoids analysis in foods. ILSI Press, Washington DC. 64 p, 2001.
Singleton, V.L., Orthofer, R., Lamuela-Raventos, R.M., Analysis of total phenols and other oxydant substrates and antioxydants by means of Folin-ciocalteu reagent. Methods Enzymology, Vol. 299, pp. 152-178, 1999.
Choi, C.W., Kim, S.C., Hwang S.S., Choi B.K., Ahn H.J., Lee M.Z., Park S.H., Kim S.K., Anti-oxidant activity and free radical scavenging capacity between Korean medicinal plant and flavonoids by assay guided comparison. Plant Science, Vol. 163, pp.1161-1168, 2002.
Fakeye, I. O., Nigerian leafy vegetable. African Journal of Science (1), pp 55-70, 1999.
Onwuka GI, Nwabara CC, Nwokedi PM, Echendu CA, Asumugha, U, Igboekwe MU., Comparative studies of the efficacy of sun drying, solar dryer and hot air oven in the preservation of tomatoes, okra, pepper and onion. Nigerian Food Journal. Vol. 20, pp. 10 – 14, 2002.
Ifon ET., Bassir O., Latunde-Dada G.O., The nutritive value of some Nigeria leafy vegetables. Part 1,Vitamin and mineral content. Food Chem., Vol. 3, pp 267-350, 2009.
Uwaegbute AC . Vegetables; nutrition and utilization in food crops production, utilization and nutrition. In: Mbah, BN, Nnanyelugo DO (eds) Dotan Publications Limited, Ibadan, 1989.
Lakshmi B, Vimla V. Nutritive value of dehydrated green leafy powders. Journal of Food Science Technology, Vol. 37 no. 5 pp. 465-471, 2000.
Kolawole OM, Ayiboye AE, Aturu EE, Anibijuwun II. Effect of solar drying on the proximate and microbial composition of Abelmoschus esculentus. Journal of Microbiology and Biotechology Research, Vol. 1 pp. 71 – 81, 2011.
Rossello C, Berna A, Mulet A Solar drying of fruits in a Mediterranean climate. Drying Technology, Vol. 8 no. 2 pp. 305 – 321, 2000.
FAO . Human vitamin and mineral requirements. FAO Ed. 361p, 2004.
Turan, M., Kordali, S., Zengin, H., Dursun, A., Sezen Y., Macro and micro-mineral content of some wild edible leaves consumed in Eastern Anatolia. Plant Soil Sciene, Vol. 53 pp. 129-137, 2003.
Okoli JN., Basic nutrition and diet therapy. University of Nigeria press Ltd. UNN Nigeria, p. 74, 2009.
Chaturvedi, V.C., Shrivastava, R. and Upreti, R.K., Viral infections and trace elements: A complex trace element. Current Science, Vol. 87 pp. 1536-1554, 2004.
Trowbridge, F., Martorell, M., Forging effective strategies to combat iron deficiency. Journal of Nutrition, Vol. 85 pp. 875-880, 2002.
Hassan, L.G., Umar, K.J., Umar, Z., Anti-nutritive factors in Tribulus terrestris (Linn) leaves and predicted calcium and zinc bioavailability. Journal of Tropical Bioscience, Vol. 7 pp. 33-36, 2007.
Umar, K.J., Hassan, L.G., Dangoggo, S.M., Inuwa, M., Amustapha, M.N., Nutritional content of Melochia corchorifolia Linn leaves. International Journal and Biological Chemistry, Vol. 1 pp 250-255, 2007.
Ekop, A.S., Eddy, N.O., Comparative studies of the level of toxicants in the seed of Indian almond (Terminalia catappa) and African walnut (Coula edulis). Chemistry Class Journal, Vol. 2 pp. 74-76, 2005.
Khalil, I. A. Saleemullah. Book of Bio Analytical Chemistry 2nd Ed. National Book Foundation Islamabad. pp. 26-29. 2004.
Udofia, U.S., Obizoba IC. Effect of traditional processing techniques on leafy vegetable and starchy staple and their uses in traditional soups and dishes as consumed in Akwa Ibom State. Journal of Biochemistry Investigation, Vol. 3 pp. 1-5, 2005.
Wachap, E., Effect of sun and shade on nutrient qualities of six seasonal Green leafy vegetables used in soups and dishes in Taraba State, Nigeria. Thesis in Nutrition presented to Department of Nutrition, University of Nigeria, Nsukka, 2005.
Russel L, McDowell RL , Vitamin in animal nutrition, comparative aspects to human nutrition. Academy Press Inc; New York, pp. 340 – 352, 1989.
Howard L. A, Wong A. D, Perry A. K, Klein B. P., β-Carotene and ascorbic acid retention in fresh and processed vegetables. Journal of Food Science, Vol. 64 pp. 929–936, 1999.
Rivera, J. R. E., Stone, M. B., Stushnoff, C., Pilon-Smits, E., Kendall, P. A., Effects of Ascorbic acid applied by two hydrocooling methods on physical and chemical properties of green leaf lettuce stored at 5 °C. Journal of Food Science, Vol. 71 pp. 270-276, 2006.
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