Evaluation of Nutritional Quality and Organoleptic Properties of Soy-poundo Yam Flour

J. I. Okoye *

Department of Food Science and Technology, Enugu State University of Science and Technology, Enugu, Nigeria.

J. I. Nwodo

Department of Food Science and Technology, Enugu State University of Science and Technology, Enugu, Nigeria.

S. I. Eze

Department of Home Economics, Federal College of Education, Eha-Amufu, Enugu, Nigeria.

*Author to whom correspondence should be addressed.


This study was designed specifically to evaluate the nutrient composition and sensory properties of soy-poundo yam flours produced from white yam and soybean flours. The white yam tubers and soybean seeds were processed into flours and blended in the ratios of 100:0, 90:10, 80:20, 70:30, 60:40 and 50:50, respectively and used to produce soy-poundo yam flours with 100 % instant yam flour used as control. The samples of soy-poundo yam flour produced were evaluated for nutrient composition and sensory properties using standard methods. The moisture, crude protein, fat, ash  and crude fibre contents of the samples increased significantly (p<0.05) with increase in substitution of soybean flour from 7.56 - 8.36%,  4.41 – 21.14%,  4.18- 5.09%, 2.51- 4.16% and 2.76 - 4.06%, respectively, while their carbohydrate and energy contents decreased from 78.74-57.21% and 370.16- 359.15KJ/100g, respectively. The mineral composition of the samples revealed that the potassium, magnesium, manganese, iron, zinc and copper contents of the products ranged from 78.34 – 164.11mg/100g, 2.46 -17.14mg/100g, 20.48 -125.53mg/100g,1.56 -2.23mg/100g, 1.78 -263mg/100g and 2.88 – 3.64mg/100g, respectively. The vitamin content of the samples showed that the vitamin A, pyridoxine, ascorbic acid, thiamine, vitamin E and niacin contents ranged from 12.00-12.70mg/100g, 2.28-2.59mg/100g, 16.1-17.07mg/100g, 56.07- 74.46mg/100g, 3.34-4.10mg/100g and 2.29 -3.22mg/100g, respectively with the control sample having the least values for all the vitamins evaluated. The sensory properties of the soy-poundo yam flour doughs obtained upon reconstitution of the samples with boiling water also revealed that the colour, taste, texture and aroma of the control sample (Poundo yam prepared from 100% instant yam flour) were the most acceptable to the assessors compared to the samples prepared from the substituted samples. Although the poundo yam dough made from the control sample was the most acceptable, the other test samples prepared from soy-yam composite blends were equally acceptable based on their relatively high scores in all the sensory attributes evaluated by the judges. The study, therefore, showed that the enrichment of yam flour with soybean at different graded levels would not only improve the nutrient contents of soy-poundo yam flour but would also add varieties to poundo yam meal due to improvement in its colour and texture.

Keywords: Poundo yam, soybean flour, supplementation, nutrient composition, sensory properties

How to Cite

Okoye , J. I., Nwodo , J. I., & Eze, S. I. (2024). Evaluation of Nutritional Quality and Organoleptic Properties of Soy-poundo Yam Flour. Archives of Current Research International, 24(4), 71–82. https://doi.org/10.9734/acri/2024/v24i4661


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Malomo O, Ogunmoyela OA. Adekoyeni B OO, Jimoh O, Oluwajoba SO, Sabanwa MO. Rheological and functional properties of soy-poundo yam flour. International Journal of Food Science and Nutrition Engineering. 2012;2(6):101-107.

Okoye JI, Ihiasota NU, Egbujie AE. Quality evaluation of garri produced from cassava mash and soybean flour. Asian Food Science Journal; 2022;21(9):109-118.

Achi OK. Quality attributes of fermented yam flour supplemented with processed soy flour. Plant Foods for Human Nutrition; 2001;54(2):151–158.

Iwuoha CL. Comparative evaluation of physicochemical qualities of flours from steam-processed yam tubers. Food Chemistry. 2004;85:541-551.

Jimoh KO, Olatidoye OP. Evaluation of physicochemical and rheological characteristics of soybean fortified yam flour. Journal of Applied Biosciences; 2009;13:703-706.

Akanbi CT, Oladeji BS. Pasting performance of composite flour from yam, cocoyam, breadfruit and plantain blends. Proceedings of the 32nd Annual Conference of Nigerian Institute of Food Science and Technology. 2008:312-313.

Ekwu FC, Ozo NO, Ikegwu OJ. Quality of fufu from white yam varieties (Dioscorea spp). Nigerian Food Journal; 2005;23:107-113.

Babajide JM, Henshaw FO, Oyewole OB. Effect of yam varieties on the pasting properties and sensory properties of traditional dry yam and its product. Journal of Food Quality. 2007;31(3):295 – 305.

Akinwande BA, Abiodun OA, Adeyemi IA, Akanbi CT. Effect of steaming methods and time on the physical and chemical properties of flour from yam tubers. Nigerian Food Journal; 2008;26(2):97-105.

Abiodun AO, Akinoso R. Effect of the harvesting periods on the chemical and pasting properties of trifoliate yam flour. Food Chemistry; 2014;142:159 –165.

Iwe MO. The Science and Technology of Soybean. Chemistry, Nutrition, Processing and Utilization. 1st edn. Rejoint Communication Services Ltd, Enugu, Nigeria. 2003;11–70.

William S, Akiko A. History of whole dry soybeans used as beans or ground, mashed or flaked. Journal of Food Science. 2013;12:212- 254.

Bolarinwa IF, Olaniyan SA, Adebayo LO, Ademole AA. Malted sorghum-soybean composite flour: preparation chemical and physico-chemical properties. Journal of Food Processing Technology. 2015;6(8): 1-7.

Song TT. Economic and health benefits of soybean seeds. Journal of Food Science and Agriculture. 2000;8:38–40.

Ndife JI, Abdulraheem LO, Zakari UM. Evaluation of the nutritional and sensory quality of functional bread produced from whole wheat and Soybean flour blends. Africa Journal of Food Science. 2011;5(2): 66-72.

FIIRO. Instant poundo yam flour production technology. American Journal of Food Science; 2005;2(3):60-80.

AOAC. Official Methods of Analysis Association of Official Analytical Chemists. Washington, DC, USA. 2010;18:614-521.

Okaka JC. Teach Yourself Sensory Evaluation and Experimentation. Ocjanco Academic Publishers, Enugu, Nigeria. 2010;68- 69.

Oluwamukomi MO, Adeyemi AO. Physicochemical, pasting and sensory properties of “poundo” yam enriched with defatted soybean flour. Journal of Applied Tropical Agriculture; 2015;20(1): 89-95.

Okaka JC, Akobundu ENT, Okaka ANC. Food and Human Nutrition. An Integrated Approach. Ocjanco Academic Publishers, Enugu, Nigeria. 2006;102-144.

Gyoung D, Mebrahtu RD.Protein, fibre, and lipid contents of vegetable protein. Journal of the American Dietetic Association. 2003;98(9):44 – 49.

Gbenga DA, Emmanuel OA, Daniel BL, Margaret MM. Nutritional composition of yam flour fortified with soy- pomace. International Journal of Research and Scientific Innovation; 2019;6:22–60.

Okafor GO. Fundamentals of Food and Nutrition. His Glory Academic Publishers, Enugu, Nigeria. 2011;69 – 88.

Fabiyi EF. Soy processing, utilization and benefits. Pakistan Journal of Nutrition; 2006;5(5):453 – 457.

Trindad PT, Mallinlin AC, Valdez DH, Loyola AS, Askali-Mercado FC, Castillo JC, Encabo RR, Musa OB, Maglaya AS, Chua MT. Dietary fibre from coconut flour: a functional food. Innovative Food Science and Emerging Technologies; 2006;7:309-317.

Lattimer JM, Haub MD. Effect of dietary fibre and its components on metabolism of healthy nutrients. Critical Reviews in Biochemistry and Molecular Biology. 2010; 2:1226- 1289.

Nwamarah JU, Uwaegbute AC. Chemical and organoleptic evaluation of soybean-yam recipes as possible snacks and food for children. Journal of Biological Research; 2006;4(1):18 – 22.

Jackson SL, Cogswell ME, Zhao L, Terry AL, Wang CY, Wright J. Associations between urinary sodium and potassium excretion and blood pressure among adults in the United States. National Health and Nutrition Examination Survey. 2018; 173:237 – 246.

Maestric DM, Kumar V, Gai Z. History and seed composition of soybean cultivars evaluated in different regions. Journal of Food Science and Agriculture. 2002;77: 494–524.

Larsson SC, Wolk A. Magnesium intake and risk of type 2- diabetes: A meta-analysis. International Journal of Medicine. 2006;262:208 – 214.

Liu KS. Chemistry and nutritional value of soybean components. Journal of Nutritional Biochemistry. 2006;25–113.

Wesslsing Resmic R. Iron and mechanisms of emotional behaviour. Journal of Nutritional Biochemistry. 2014; 25(11):1101-1107.

Folake OS, Bolank OO, Titilope A. Nutrient and antinutrient contents of soy-enriched tapioca. Food and Nutrition Bulletin. 2012; 33:784-789.

Whittaker P. Iron and zinc interactions in humans. American Journal of Clinical Nutrition; 2001;68:442 – 446.

Bonham M, O’Connor JM, Hannigan BM, Strain, JJ. The immune system as a physiological indicator for marginal copper status. British Journal of Nutrition; 2002;87 (5)393– 403.

Beleke A, Beleke E. Proximate and mineral composition of Ethiopian yam (Dioscorea specie). Journal of Food and Nutrition. 2018;6:12-17.

Jacob RA, Sotoundeh G. Vitamin, function and status in chronic disease. Nutrition in Clinical Care. 2002;5:66– 74.

Alinnor IJ, Akalezi CO. Proximate and mineral composition of Dioscorea rotundata (white yam) and Colocasia esculenta (white cocoyam). Pakistan Journal of Nutrition. 2010;9(10):998–1001.

Bruno RS, Mah E. Vitamin as a natural antioxidant. Journal of Biomedical Sciences. 2014;5(3):482 – 499.

Butt MS, Batool R. Nutritional and functional properties of some promising legume protein isolates. Pakistan Journal of Nutrition. 2010;9(4):374-379.

Olaoye OA, Ade-Omowaye BIO. Composite Flours and Breads; Potential of Local Crops in Developing Countries. In: Preedy, V.R., Watson, R.R. and Patel, V.B. (edn), flours and breads and their fortification in health and disease prevention. Academic Press, Elsaevier, London. 2011; 189 – 193.