Nutritional Characteristics of Rice (Oryza sativa L.) Composite Flours Obtained by Food Fortification


  •   Violet K. Mugalavai

  •   Kevin O. Aduol

  •   Augustino O. Onkware


High prevalence of protein-energy malnutrition among the vulnerable population, especially children has prompted research on fortification of common staple cereal foods such as rice. However, rice has inferior nutritional value compared to other popular cereals, such as maize, therefore limiting its full utilization. Its storage protein, glutelins, is not easily digested by monogastric animals; therefore, food to food fortification of rice flours provides protein nutritional compensation as well as improvement of other nutrients. This study was carried out to determine the proximate and mineral (Fe, Zn, Mg, Ca, P) composition of rice composite flours. Methodology: The blending ratios (rice: maize: sorghum: pumpkin: carrots: baobab: amaranth) used in the study were 70:0:0:7.5:7.5:5:10 (AT1), 45.5:24.5:0:7.5:7.5:5:10 (AT2), 35:35:0:7.5:7.5:5:10 (AT3), 23.3:23.3:23.3:7.5:7.5:5:10 (AT4) and 100% rice flour (AT5). Proximate analyses were performed according to Association of Official Analytical Chemist (AOAC) methods. Atomic absorption spectroscopy was used to determine the minerals. Data analysis was done using Analysis of Variance (ANOVA). Mean comparisons for treatments were done using Bonferroni tests and significance level was set at P≤0.05. Findings: Moisture content of the composite flours ranged from 10.87 to12.55% and was significantly different (p<0.05). Ash content was not significantly different (p<0.05) and ranged between 1.08 and 1.85%. The fat content ranged between 5.38 and 10.67%; with AT4 having the highest and AT5 having the least fat content. The carbohydrate content was significantly (p<0.05) different among the flour; ranging between 66.65 and 73.51%. Crude fibre ranged between 1.42 and -2.20%, whereas the protein content ranged from 6.88 to 7.73%. Iron content ranged between 0.06 and 0.08 mg/100g zinc ranged from 0.19 to 0.56 mg/100g. The phosphorus content ranged from 0.07 to 0.18 mg/100g with no significant (p<0.05) difference. The calcium content was significantly (p<0.05) different among the flours and ranged from 1.41 to 1.91 mg/100g. Conclusion: The results show that the flour composites have the potential to improve nutritional status of consumers. Thus, consumption of AT1, AT4 and AT5 composite flours with a protein content of 7.3%, 7.7% and 7.4% maybe recommended for children aged 6 - 59 months in order to prevent protein-energy malnutrition.

Keywords: rice flours, proximate, composites, value-added


F. G. Horgan, F. A. Ramal, C. C. Bernal, J. M. Villegas, A. M. Stuart & M. L. P Almazan. (2016). Applying ecological engineering for sustainable and resilient rice production systems. Procedia Food Science, 6(Icsusl International Conference of Sabaragamuwa University of Sri Lanka 2015 (ICSUSL 2015)), 7–15.

F. D. Wireko-manu & C. Amamoo. (2017). Comparative Studies on Proximate and Some Mineral Composition of Selected Local Rice Varieties and Imported Rice Brands in Ghana. Agriculture and Food Sciences Research, 4(1), 1–7.

E. A. Atera, F. N. Onyancha & E. B. O. Majiwa. (2018). Production and marketing of rice in Kenya : Challenges and opportunities. Journal of Development and Agricultural Economics, 10(3), 64–70.

FAO. (2012). Analysis of Incentives and Disincentives for Rice in Kenya, (December). Retrieved from

Ministry of Agriculture. (2018). National Rice Development Strategy (2008 – 2018). Republic of Kenya.

E. A. Atera, J. C. Onyango, T. Azuma, S. Asanuma, & K. Itoh. (2011). Field evaluation of selected NERICA rice cultivars in Western Kenya. African Journal of Agricultural Research, 6(1), 60–66.

Kenya Bureau of Statistics, (2016). Economic Survey 2016. Nairobi, Kenya, 144–165.

E. M. Blase. (2020). Optimisation of Rice Flour Traits for the Production of Indigenous Rice Recipes. Current Research in Nutrition and Food Science, 08(1), 349–359. Retrieved from

J. L. Balindong, R. M. Ward, L. Liu, T. J. Rose, L. A. Pallas, B. W. Ovenden, P. J. Snell, D. L. E. Waters. 2018. Rice grain protein composition influences instrumental measures of rice cooking and eating quality. J Cereal Sci, 79: 35–42.

F. Takaiwa, M. Ogawa, T. W. Okita (1999) Rice Glutelins. In: P. R.Shewry, R. Casey (eds) Seed Proteins. Springer, Dordrecht.

S. Chandra & Samsher. (2013). Assessment of functional properties of different flours. African Journal of Agricultural Research, 8(38), 4849–4852.

V. K. Mugalavai, J. O. Oyalo, & A. O. Onkware (2020). Characterization of The Nutritional Properties of Sorghum Composite Flours Using Different Food to Food Fortification Approaches. European Journal of Agriculture and Food Sciences, 2(6), 1–7.

X. Li, Y. Liu, N. Li, D. Xie, J. Yu, F. Wang & J. Wang (2016). Studies of phase separation in soluble rice protein / different polysaccharides mixed systems. LWT-Food Science Technology, 65, 676–682.

C.K. Reddy, L. Kimi, S. Haripriya & N. Kang (2017). Effects of Polishing on Proximate Composition, Physico-Chemical Characteristics, Mineral Composition and Antioxidant Properties of Pigmented Rice. Rice Science, 24(5), 241–252.

H. Twinomuhwezi, C. G. Awuchi & M. Rachael (2020). Comparative Study of the Proximate Composition and Functional Properties of Composite Flours of Amaranth, Rice, Millet, and Soybean. American Journal of Food Science and Nutrition, 6(1), 6–19.

U. G. Ojali, A. U. Elijah, A. O. Nicholas & B. R. Morayo (2015). Proximate Composition and Anti-nutrient Properties of Breakfast Cereal Made from Blends of Local Rice, Soybeans and Defatted Coconut Flours. Journal of Nutrition & Food Sciences, 11(ISSN: 2155-9600), 8–10.

U. E. Inyang, C. F. Effiong & A. P. Edima-nyah (2018). Physical Properties, Nutritional Composition and Sensory Evaluation of Cookies Prepared from Rice, Unripe Banana and Sprouted Soybean Flour Blends. International Journal of Food Science and Biotechnology, 3(2), 70–76.

B. O. Juliano (1991). Rice in Human Nutrition. International Rice Research Institute, 26(1).

S. Mohammad & T. Gharibzahedi (2018). Favorite and traditional rice flour e based puddings, breads, and pastries in the north of Iran : A review. Journal of Ethnic Foods, 5(2), 105–113.

J. Pongjanta, A. Naulbunrang, S. Kawngdang, T. Manon & T. Thepjaikat (2006). Utilization of pumpkin powder in bakery products. Songklanakarin J. Sci. Technol., 28(March), 71–79.

J. K. Kikafunda, L. Abenakyo & F. B. Ludwig (2006). Nutritional and Sensory Properties of High Energy / Nutrient Dense Composite Flour Porridges from Germinated Maize and Roasted Beans for Child-Weaning in Developing Countries : A Case for Uganda. Ecology of Food and Nutrition, (45), 279–294.

AOAC, Official Methods of Analysis of AOAC International, 17th edn. (Association of Official Analytical Chemists (AOAC) International, Gaithersburg, 2000).

C. Anino, A. N. Onyango, S. Imathiu, J. Maina & F. Onyangore (2019). Chemical composition of the seed and ‘milk’ of three common bean (Pharsalus vulgaris L) varieties. Journal of Food Measurement and Characterization, 0(0), 0.

K. O. Aduol, A. N. Onyango & S. Imathiu (2020). Proximate, Microbial and Sensory Characteristics of Cowpea Milk Fermented with Probiotic Starter Cultures. European Journal of Agriculture and Food Sciences, 2(4), 2.

M. A. Zubair, M.S. Rahman, M.S. Islam, M. Z. Abedin & M. A. Sikder (2015). A Comparative Study of the Proximate Composition of Selected Rice Varieties in Tangail, Bangladesh. J. Environ. Sci. & Natural Resources, 8(2), 97–102.

D. K. Verma & P. P. Srivastav (2017). Proximate Composition, Mineral Content and Fatty Acids Analyses of Aromatic and Non-Aromatic Indian Rice. Rice Science, 24(1), 21–31.

G. Eshun (2009). Baseline data on the nutrient content and physicochemical properties of selected varieties of soybean, groundnut and rice for the development of nutritious, energy-dense diets.

C. G. Awuchi (2019). Proximate Composition and Functional Properties of Different Grain Flour Composites for Industrial Applications. International Journal of Food Sciences (IJF), 2(1), 43–64.

S. Chandra, S. Singh & D. Kumari (2015). Evaluation of functional properties of composite flours and sensorial attributes of composite flour biscuits. J Food Sci Technol, 52(6), 3681–3688.

M. Iwe, U. Onyeukwu & A. N. Agiriga (2016). Proximate, functional and pasting properties of FARO 44 rice, African yam bean and brown cowpea seeds composite flour. Cogent Food & Agriculture, 2, 1–10.

X. Zheng & Y. Lan (2007). Effects of Drying Temperature and Moisture Content on Rice Taste Quality. Agricultural Engineering International: The CIGR Ejournal, IX (November), 1–9.

B. I. Offia-olua (2014). Chemical, Functional and Pasting Properties of Wheat (Triticumspp) -Walnut (Juglansregia) Flour. Food and Nutrition Sciences, 5(August), 1591–1604.

O. A. T. Ebuehi & A. C. Oyewole (2007). Effect of cooking and soaking on physical characteristics, nutrient composition and sensory evaluation of indigenous and foreign rice varieties in Nigeria. African Journal of Biotechnology, 6(8), 1016–1020.

E. Adu-kwarteng, W.O. Ellis, I. Oduro & J. T. Manful (2003). Rice grain quality : a comparison of local varieties with new varieties under study in Ghana. Food Control, 14, 507–514.

C. Diako, E. Sakyi-dawson, B. Bediako-Amoa, F.K Saalia & J. T. Manful (2010). Consumer Perceptions, Knowledge and Preferences for Aromatic Rice Types in Ghana. Nature and Science, 8(12), 12–19.

M. Frei, P. Siddhuraju & K. Becker (2003). Studies on the in vitro starch digestibility and the glycemic index of six different indigenous rice cultivars from the Philippines. Food Chemistry, 83, 395–402.

G. B. Gregorio (2002). Progress in Breeding for Trace Minerals in Staple Crops. American Society for Nutritional Sciences, (March), 500–502.

M. A. Grusak (2013). Enhancing Mineral Content in Plant Food Products. Journal of the American College of Nutrition, 21(3), 178–183.

K. O. Jimoh & O. P. Olatidoye (2009). Evaluation of physicochemical and rheological characteristics of soybean fortified yam flour. Journal of Applied Biosciences, 13, 703–706.

A. A. Mahmoud, S. Sukumar & H. B. Krishnan (2008). Interspecific Rice Hybrid of Oryza sativa × Oryza nivara reveals a Significant Increase in Seed Protein Content. Journal of Agricultural and Food Chemistry, 56(2), 476–482.

A. O. Oko & S. I. Ugwu (2011). The proximate and mineral compositions of five major rice varieties in Abakaliki , South-Eastern Nigeria. International Journal of Plant Physiology and Biochemistry, 3(2), 25–27.

M. Rivero-huguet, R. Huertas, L. Francini, L.Vila, E. Darré & L. Tecnológico (2006). Concentrations of As , Ca , Cd , Co , Cr , Cu , Fe , Hg , K , Mg , Mn , Mo , Na , Ni , Pb , and Zn in Uruguayan Rice Determined by Atomic Absorption Spectrometry. Atomic Spectroscopy, 27(1), 51–59.

P. Roy, T. Ijiri, H. Okadome, D. Nei, T. Orikasa, N. Nakamura & T. Shiina (2008). Effect of processing conditions on overall energy consumption and quality of rice (Oryza sativa L.). Journal of Food Engineering, 89(3), 343–348.

M. W. Tenagashaw, G. M. Kenji, E. T. Melaku, S. Huyskens-Keil & J. N. Kinyuru (2016). Proximate composition and selected functional properties of complementary foods from teff fortified with soybean and orange-fleshed sweetpotato. RUFORUM Working Document Series (ISSN 1607-9345), 14(1), 953–965.

T. P. Trinidad, A. C. Mallillin, R. S. Sagum, D. P. Briones, R. R. Encabo & B. O. Juliano (2009). Iron absorption from brown rice / brown rice-based meal and milled rice / milled rice-based meal. International Journal of Food Sciences and Nutrition, 60(8), 688–693.

FAOSTAT statistical database. Rome: Food and Agriculture Organization, 2001.

J. Barron, "Black rice bran, the next superfood? Baseline of Health Foundation. 21ST SEPT." Retrieved from, 2010.

T. K. Abbey, A. Alhassan, K. Ameyibor, J. W. Essiah, E. Fometu, and M. B. Wiredu, Integrated science for senior secondary schools vol. 75, 76, 451. Accra North, Ghana: Unimax Maxmillan Ltd, 2001.

R. L. Tinsley and P. Emeritus, Increasing rice productivity for the kpong irrigation project. Akuse-Asutsuare, Ghana: Colorado State University ACDI/VOCA Farmer-to-Farmer Program, 2009.

R. K. Singh, P. L. Gautam, S. Saxena, and S. Singh, Scented rice germplasm: Conservation evaluation and utilization. In: Singh, U., S., Singh, R., K., andKhush, G., S., Aromatic rices. New Delxi, Calcutta: Oxford & IBH Publishing Co. Pvt. Ltd, 2000.FAO, PAN American Health Organization, and WHO, ‘’Food Handlers Manual Instructions, ‘’ FAO and WHO, Washington, D.C., USA, 2017.


How to Cite
Mugalavai, V. K., Aduol, K. O., & Onkware, A. O. (2021). Nutritional Characteristics of Rice (Oryza sativa L.) Composite Flours Obtained by Food Fortification. European Journal of Agriculture and Food Sciences, 3(1), 79-83.