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Effect of Traditional Methods of De-bittering on the Proximate and Vitamin Contents of Fresh and Squeezed-Washed Bitter Leaf
International Journal of Nutrition and Food Sciences
Volume 4, Issue 1, January 2015, Pages: 103-110
Received: Jan. 26, 2015; Accepted: Feb. 6, 2015; Published: Feb. 10, 2015
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Agomuo Jude Kelechi, Department of Food Science and Technology, Federal University Dutsin-ma, Katsina State, Nigeria
Alaka Ignatius Chukwuemeka, Department of Food Science and Technology, Ebonyi State University, Ebonyi State, Nigeria
Akajiaku Linda Oluchi, Department of Food Science and Technology, Federal University of Technology Owerri, Owerri, Imo State, Nigeria
Taiwo Mayomi, Department of Food Science and Technology, Federal University Dutsin-ma, Katsina State, Nigeria
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Bitter leaf is a leafy vegetable that is widely consumed and cherished in South-Eastern Nigeria. The effect of traditional methods of de-bittering of bitter leaf (Vernonia amygdalina) on the proximate and vitamin contents was studied using potash, palm oil, and salt and boiling process in squeeze-washing at 3 pre-processing methods of squeeze-wash and periods of 3 to 8 minutes. The percentage retention and losses of nutrients increased simultaneously during squeeze-washing. The sample squeezed-washed with palm oil had nutrient retention ranging between 55 to 100% of moisture, ash, crude fibre, fat, vitamin A and vitamin C than other squeeze-washed samples. This could be due to the rigidity of the cells of the sample squeezed-washed with palm oil which did not allow much nutrient to leach into the squeezed leaf water; whereas, the loss of nutrient was practically of the same magnitude (27.3 to 80.5%) in all other samples. The loss of nutrients was observed to be influenced directly by the cause-and-effect of disintegration changes which usually leads to softening due to the severity of the squeeze-washing on the bitter leaf instead of cellular composition or level of nutrient initially present. Palm oil should be used in the squeeze-washing of bitter leaf for better nutrient retention.
Bitter Leaf, Palm Oil, Potash, Salt, Squeeze-Washing
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Agomuo Jude Kelechi, Alaka Ignatius Chukwuemeka, Akajiaku Linda Oluchi, Taiwo Mayomi, Effect of Traditional Methods of De-bittering on the Proximate and Vitamin Contents of Fresh and Squeezed-Washed Bitter Leaf, International Journal of Nutrition and Food Sciences. Vol. 4, No. 1, 2015, pp. 103-110. doi: 10.11648/j.ijnfs.20150401.24
A.O.A.C. (2005) Official methods of Analysis of Association of Analytical Chemists. Washinghton D.C.
Adeboye, A.S. and Babajide, I.M. (2007) Effects of processing methods on anti-nutrients in selected leafy vegetables. Nigerian Food Journal 25(2): 77-87.
Adepoju, O.L.T., Onasanya, L.O. and Udoh, C.H. (2006). Comparative studies of nutrient composition of cocoyam (Colocassia esculanta) leaf with some green leafy vegetables. Nig. J. Nutr. Sci., 27 (1): 22-26.
Aina, J.O. U.O, E.E. (1990) Bitter Leaf (vernonia amygdalina): A potential tropical hop substitute.. Discovery and Innovation 2:63-66.
Ajayi, I.A., Oderinde R.A, Kalogbola, D.O and Ukponi J.U (2006). Oil of underutilized legumes from Nigeria. Food chemistry 99(1): 115-120.
Ajebesome, P.E and Aina, J.O. (2004). Potential African substitutes for hops in tropical beer brewing. African Journal of Food Technology 9:13-16
Akubugwo, , I.E., Obasi, N.A., Chinyere, G.C. and Ugbofu, A.E. (2007). Nutritional and chemical value of Amarathus hybridus L. leave from Afikpo, Nigeria. African Journal of Biotechnology 6(24):2833-2839.
Akubugwo, I.E., Obasi, N.A., chinyere, C.O and Ugbofu, A.E (2008)Mineral and photochemical contents in leaves of Amaranthus hybridus L. and Solanum nigruumn L. subjected to different processing methods. African Journal of Biochemistry Research 2(3):40-44.
Aletor, M.V. and Adeogun, O.A. (1995). Nutrient and antinutrient compostion of some tropical leafy vegetable. Food chemistry 54(4): 375-379.
Atangwho, I.J., Ebong, P.E, Eyong, E.U., Williams, I.O, Eteng, M.U. and Egbung, G.E. (2009). Comparative chemical composition of leaves of some anti-diabetic medicinal plants: Azadirachta indica, Vernonia amygdalina and Gongronema Latifolium. African Journal of Biotechnology 8(18):4685-4689.
Chima, C.E. and Igyor, M.A. (2007). Micronutrients and anti-nutritional contents of selected tropical vegetable grown in south-Eastern Nigeria. Nigerian Food Journal. 25(1):111-117.
Ejoh, A.A., Djuikwo, V.N., Gouado, I. and Mbofung, C.M. (2007a). Nutritional components of some non-conventional leafy vegetables consumed in Cameroon. Pakistan Journal of Nutrition 6(6):712-717.
Ejoh, A.R., Tchouanguep, M.F. and Fokou, E. (1996). Nutrient compostion of the leaves and flower of Colocassia esculenta and the fruits of Solanum melongena. Plant Food for Human Nutr. 49:107-112.
Enwere, N.J. (1998). Foods of Plant Origin. Afro Orbis Publication Ltd, Nsukka pp.160-166.
Eunok, C., Rongmin, h. and David, B.M (2005). Chemical reaction and stability of Riboflavin in foods. Journal of food Science70 (1): R29-R36.
Gupta, S., Lakshmi, A.J., Majunah, M. N and. Prakash, J. (2005). Analysis of nutrient and antinutrient contents of underutilized green leafy vegetables LWT. Food Science and Technology 38:339-345.
Hildreth, E.M. (1971) Elementary Science of Food. The trinity Press Worcester, London Pp35-62.
Ifon, E.T and Bassir, O. (1980). The nutritive value of some Nigeria Leafy Vegetable Part 2: the distribution of protein, carbohydrates (including Ethanol, Soluble simple Sugars), Crude fat, Fibre and Ash. Food Chemistry 5:231-235.
Ifon, E.T and Bassir, O. (1989). The nutritive value of some Nigeria leafy Green Vegetable Part 1: vitamin and Mineral contents. Food chemistry 4:263-267.
Igile, G.O., Oleszyek, W., Burda, S. and Jurzysta,N. (1995). Nutritional assessment of Veronomia Amygdalina leaves in growing mice. Journal of Agriculture and Food Chemistry 43:2162-2166.
Ihekoronye, A.I and Ngoddy, P.O (1985) Tropical Fruits and Vegetables in: Intergrated Food Science and Technology for the Tropics, Macmillian pub.Ltd, London p293-311.
International Gaithersburg, MD. USA: 134-143.
Julie, B. (2003). The importance of Vitamins and their role in our body. Ezine Articles pp.1-5.
Kelsay, J.C. and Prather, E. (1985). Mineral balance of Human subject consuming Spinach in low fiber diet and in a diet containing fruits and vegetables. Amer J. Clin. Nutr. 38:12-19.
Kola. A. (1999). Analysis of the nutritive element of some Nigerian leafy vegetables. Proceedings of 3rd annual Conference of Nigerian institute of Food Science and Technology held in Abuja p.158.
Lund, G.O and Smoot,J.M (1982). Dietary fiber content of some tropical fruits and vegetables. J. Agric Food chem…30:1123-1127.
Lassen, A., Kall, M., Hansen, K. and ovesen, L. (2002). A comparison of the retention of vitamins B1, B2 and B6 and cooking yield in pork loin with conventional and enhanced meal-service systems. European Food Research Technology 215:194-199.
Latham, M.G. (1997). Human nutrition in developing world. FAO Rome Food and Nutrition Series. P.315
Latunde-Dada, G.O (1990). Effects of processing on Iron level in and bioavailability from Nigerian vegetables. Journal of Food Science and Agriculture 5:355-361.
Lean M.N., (2006). Vitamins and other bioactive food constituents in: Food Science, Nutrition and Health (7th edition). Edward Hodder Ltd, London pp198-216.
Lewu, M.N., Adebola, P.O and Afolayan, A.J. (2009). Effects of cooking on the proximate composition of the leaves of some accession of Colocassia esculenta (L) Shoot in Kwazulu- Natal Province of South African. African journal of biotechnology 8(8):1619-1622.
Lyimodo, M., Nyagwegwe, S.N and Ap Mnkem (1991) Investigations of Traditional Food for Human Nutrition 41; 53-57.
Mayhew,S. and Penny, A. (1998). Tropical and Subtropical Foods Macmillian Publishers, London, p.107
Morah, G.N. and Obiegbuna, J.E. (2002). The effect of different pre-washing and washing treatment on some chemical and sensory properties of bitter leaf vegetable. Nigerian Food Journal 20:52-57.
Nkafamiya, I.I., Manji, A.J., Modibbo, U.U. and umaru, H.A. (2006). Biochemical evaluation of Casspourea congoensis (Tunti) and Nudea Latifolia (UZZIZA) FRUITS. African Journal of Biotechnology 6(19): 2461-2463.
Nkafamiya, I.I., Oseameahon., S.A. Modibbo, u.U. and Haggai, D. (2010). Vitamins and effect of blanching on nutritional values of non-conventional leafy vegetables. African Journal of Food Science 4(6): 335-341.
Okafor, J. C. (1983). Horticulturally promising indigenous wild plant species of the Nigerian forest zone Acta. Nort. 123:165-176.
Okafor, J.C. (1979). Edible indigenous woody plants in the rural ecosystem (D.U.U. Okali, ed). Proceeding of M.A.B. Workshop on the Nigerian Rainforest Ecosytem. University of Ibadan, Nigeria.
Okafor, J.C. (1995). Conservation and use of traditional vegetables from woody forest species in South-Eastern Nigeria in: Proceedings of the IPGRI Workshop on Genetic Resources of Traditional vegetables in African, Nairobi.
Okwu, D.E. (2004). The phytochemical and vitamin content of indigenous species of South Eastern Nigeria leaves. Journal of Sustained Agriculture and Environment 6:30-34.
Okwu, D.E. Ndu, C.U. (2006). Evaluation of the Phytonutrients, Minerals and vitamin content of some varieties of Yam (Doscorea spp). International Journal of Molecular Medicine and Advanced Sciences 2(2):199-203.
Ruttledge, P. (1991). Preparation Procedures in: Arty. V.D. and Dennis, C. (eds) Vegetables Processing in U.K. Blackie, Glasgow p.68.
Said,H.M. and Mohammed, Z.M. (2006) ”Intestinal Absorption of Water-soluble Vitamins: an update”. Curr. Opin. Gastroenteral 22(2): 140-146.
Saidu, A.N. and Jideobi, N.G. (2009. The proximate and elemental analysis of some leafy vegetables grown in Minna and Environs. Journal of Applied Science Environment and Management 13(4):21-22.
Uwaegbute, A.C. (1989). Vegetable Nutrition and utilization. In: Mba, B.E. and Nnanyelugo D.C. (eds) Food Crops Production, Utilization and nutrition. Dotam Publishers Ltd, Ibadan, Nigeria; pp.145-153.
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