Quality and Safety of Soybean Oils in Makurdi: Physicochemical Properties, Contaminants, and Residues
DOI:
https://doi.org/10.54536/ajfst.v4i2.4592Keywords:
Aflatoxins, Heavy Metal, Physicochemical Properties, Refining, Soybean OilAbstract
The study aimed to investigate the physiochemical properties, heavy metals, total aflatoxins, and solvent residues in soybean oils produced in some parts of the Makurdi metropolis. The oil samples were collected from “Seraph” and “Hule and Sons” vegetable oil factories in Makurdi. Samples include: Seraph crude soybean oil (A1), Seraph Refined soybean oil (A2), Hule and Sons crude soybean oil (B1), and Hule and Sons refined soybean oil (B2). Analysis showed that the physicochemical properties varied between the refined and unrefined samples. Specific gravity increased from 0.807 to 0.923, 0.822 to 0.931 for A1 and A2 and B1 and B2 respectively. The peroxide value reduced from 9.71 to 9.6 (mEq.O2kg-1) after refining. Iodine value and moisture content also reduced with refining. Cadmium, arsenic, and lead were detected only in the crude soybean oil (A1 and B1) copper content reduced from 5.3 to 2.6 mg/kg, and nickel decreased from 0.55 to 0.01 mg/kg upon refining. Crude soybean oil content (A1 and B1) total aflatoxins of 6.05 ppm and 7.10 ppm respectively. No aflatoxin was detected in the refined oil samples. Major chemical compounds and solvent residues in refined soybean oil (A2) composed of 21.10% 2,4–Decadienal, 18.16% n-Hexadecanoic acid, 4.66% Bicyclo [3.1.1] heptane, 4.45% 1,6,10,14–Hexadecatetraen-3-ol, 4.17% p-xylene, 4.22% cyclohexane, 5.05% cyclopentane, 1.69% 9-Eicosyne and 3.88% toluene. While B2 composed mainly of 2,4-decadienal (27.92%), 2-pentene (17.42%), Bicyclo [3.1.1] heptane (2.10%), 9-octadecyne (1.45%), 2-methyl-E-7-octadecane (1.31%), 2-Heptenal (2.17%), Cyclohexane (2.33%) and Hexanal (2.90%). Refining has a significant role in the physicochemical properties of soybean oil. Refining greatly reduces heavy metal content and aflatoxin in crude vegetable oils.
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References
Aghemwenhio, I. S., Timilehin, A. A., & A, G. (2017). Susceptibility of beta-haemolytic Escherichia coli to commonly used antibiotics in selected hospitals in Delta State, Southern Nigeria. Archives of Clinical Microbiology, 08(02), 1–7.
Asemave, K., Ubwa, S. T., & Anhwange, B. (2012). Comparative evaluation of some metals in palm oil, groundnut oil, and soybean oil from Nigeria. International Journal of Modern Chemistry, 1(1), 27–35.
Association of Official Analytical Chemists (AOAC). (2015). Official methods of analysis (21st ed.). Washington, D. C., USA.
Attah, J. C., & Ibemesi, J. A. (1990). Solvent extraction of the oils of rubber, melon, pumpkin, and oilbean seeds. Journal of the American Oil Chemists’ Society, 67(1), 25–27.
Bello, I. (2015). Physicochemical properties of some commercial groundnut oil products sold in Sokoto metropolis, Northwest Nigeria.
Cerutti, M. L. M. N., De Souza, A. A. U., & De Souza, S. M. D. A. G. U. (2012). Solvent extraction of vegetable oils: Numerical and experimental study. Food and Bioproducts Processing, 90(2), 199–204.
Codex Alimentarius Commission. (2009). Joint FAO/WHO Food Standards Programme, Codex Committee on Fats and Oils. Rome.
Gando, M., Ferida, I., Yusuf, C., & Hassan, A. (2014). Concentrations of metals in roadside foods sold in Kano. Journal of Agricultural and Food Chemistry, 50, 237–243.
Gu, Q. (2019). Prediction and risk assessment of five heavy metals in maize and peanut: A case study of Guangxi, China. Environmental Toxicology and Pharmacology, 70, 103199.
Idris, Y. M. A., Mariod, A. A., Alfaig, I., & Ali, A. (2010). Determination of aflatoxin levels in Sudanese edible oils. Food and Chemical Toxicology, 48(8–9), 2539–2541.
Ikebueze, A., Mghweno, L., Magoha, H., Nakajugo, A., & Wekesa, M. J. (2009). Environmental cadmium and lead pollution and contamination in food sold in Anambra State. African Journal of Environmental Science and Technology, 2(10), 349–356.
Kalappurayil, T. M., & Joseph, B. P. (2017). A review of pharmacognostical studies on Moringa oleifera Lam. flowers. Pharmacognosy Journal, 9(1).
Karunarathna, N. B., Fernando, C. J., Munasinghe, D. M. S., & Fernando, R. (2019). Occurrence of aflatoxins in edible vegetable oils in Sri Lanka. Food Control, 101, 97–103.
Kenechi, N., Felix, A., Linus, C., & Kayode, A. (2017). Analysis of the physicochemical properties of palm oil within Isialangwa Local Government Area of Abia State, Nigeria. International Journal of Bioorganic Chemistry, 2(4), 159–162.
Lagerwerff, J., & Specht, A. (2017). Contamination of roadside soil vegetation with cadmium, nickel, lead, and zinc. Journal of Environmental Science and Technology, 4, 583–586.
Makni, M., Haddar, A., Ben Fraj, A., & Zeghal, N. (2015). Physico-chemical properties, composition, and oxidative stability of olive and soybean oils under different conditions. International Journal of Food Properties, 18(1), 194–204.
Mehmood, T., Ahmad, A., Ahmed, A., & Khali, N. (2012). Quality evaluation and safety assessment of different cooking oils available in Cross River State. Journal of Chemical Society of Nigeria, 34(3), 18–25.
Michulec, M., & Wardencki, W. (2004). Determination of solvent residues in vegetable oils and pharmaceuticals by headspace analysis and capillary gas chromatography. Chromatographia Supplement, 60, 273–277.
Mohdaly, A. A. E.-R., El-Hameed Seliem, K. A., Maher Abu EL-Hassan, A. E.-M., & Mahmoud, A. A. T. (2017). Effect of refining process on the quality characteristics of soybean and cottonseed oils. International Journal of Current Microbiology and Applied Sciences, 6(1), 207–222.
Murshed, S. A. A., Bacha, N., & Alharazi, T. (2019). Detection of total aflatoxins in groundnut and soybean samples in Yemen using enzyme-linked immunosorbent assay. Journal of Food Quality, 1(1), 1–7.
Negash, D. (2018). A review of aflatoxin: Occurrence, prevention, and gaps in both food and feed safety. Journal of Applied Microbiology Research, 1(1), 35–43.
Ohimain, E. I., Izah, S. C., & Fawari, A. D. (2013). Quality assessment of crude palm oil produced by semi-mechanized processor in Bayelsa State, Nigeria. Discourse Journal of Agriculture and Food Science, 1(11), 171–181.
Okechalu, J. N., Dashen, M., Lar, P. M., Okechalu, B., & Gushop, T. (2011). Microbiological quality and chemical characteristics of palm oil sold within Jos metropolis, Plateau State, Nigeria. Journal of Microbiology and Biotechnology Research, 1(2), 107–112.
PACA. (2015). Aflatoxin impacts and potential solutions in agriculture, trade and health: An introduction to aflatoxin impacts in Africa. IARC Monograph, 82, 172–300.
Pankaj, S. K., Shi, H., & Keener, K. M. (2017). A review of novel physical and chemical decontamination technologies for aflatoxin in food. Trends in Food Science & Technology, 71, 73–83.
Sowley, E. (2016). Aflatoxins: A silent threat in developing countries. African Journal of Biotechnology, 159(35), 1864–1870.
Srbinovska, A., Conchione, C., Ursol, L. M., Lucci, P., & Moret, S. (2020). Occurrence of n-alkanes in vegetable oils and their analytical determination. Foods, 9(10), 1–19.
Waqas, M. (2021). Occurrence of aflatoxins in edible vegetable seeds and oil samples available in Pakistani retail markets and estimation of dietary intake in consumers. International Journal of Environmental Research and Public Health, 18(15), 1–12.
World Health Organization (WHO). (2019). Standard for named vegetable oils: Report of the 17th session of the WHO/FAO Committee on Fats and Oils. London, 19–23.
Zhang, W., Cao, X., & Liu, S. Q. (2020). Aroma modulation of vegetable oils—A review. Critical Reviews in Food Science and Nutrition, 60(9), 1538–1551.
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