Comparative analysis of the physicochemical properties and trace metal content of palm oil, from selected markets in Jos south and Jos north LGA, Plateau state, Nigeria

Comparative Analysis of the Physico-Chemical Properties and Trace Metal Content of Palm Oil

  • Authors

    • Gungshik J. R University of Jos, Nigeria
    • Onyemowo O. A Department of Chemistry, University of Jos, Jos P.M.B. 2084, Jos Plateau State
    • Rabiat L. A Department of Chemistry, University of Jos, Jos P.M.B. 2084, Jos Plateau State
    2024-10-26
    https://doi.org/10.14419/nrn2tt65
  • Physicochemical Properties; Palm Oil; Trace Element; Adulteration Atomic Absorption Spectrophotometer

  • Abstract

    The quality of palm oil samples collected from three different markets in Jos South and Jos North Local Government Area of Plateau State were analyzed and evaluated using standard analytical laboratory procedures. The relative ranges of the physicochemical values obtained were as follows; Moisture Content (MC): 0.56 - 1.89, Iodine value (IV); 51.88 - 55.57 g I2/100g, Peroxide Value (PV): 0.98 - 4.16 mEq02/kg, Saponification Values (SV): 198.46 - 201.54 mgKOH/g, Acid Value (AV): 9.93 - 57.65, and Refractive Index (RI), 1.4576 - 1.4580. The moisture content, iodin value, pH values and acid values were found to exceed the Standard Organization of Nigeria (SON) permissible limits of moisture content (0.29 mgKOH/g), iodine value (45 - 53 mg I2/100g), pH (5 - 7 mg/L), and acid value (0.7 max mg/L) for edible oils respectively while the refractive index, saponification values, peroxide values falls within the SON allowable limits of refractive index (1.4612-1.4707 mg/L), saponification value (195-205 mgKOH/g) and peroxide value (10 mEq02/kg) respectively . The amounts of trace metals (Cu, Zn, Fe, Pb and Cd) determined in the palm oil using the atomic absorption spectrophotometer ranged from Cu(0.34 - 0.52 mg/l), Zn(1.58 - 2.33 mg/l), Fe(19.18 - 26.74 mg/l), Pb(2.87 - 4.06 mg/l) and Cd(1.58 - 2.24 mg/l). However, the levels of Zn, Fe, Pb and Cd exceeded the WHO/FAO recommended values of (1.50, 1.00, 0.05 and 0.02 mg/L) respectively while only Cu concentration was below the WHO/FAO limits of 2.00 mg/L for trace metals in edible palm oil. Consequently, the results of this study shows that the palm oil consumed from these selected markets does not meet the standard quality specification for edible palm oils and hence can post significant health threat to consumers. Therefore, food regulatory agencies should strengthen their surveillance to promote food and health safety of the populace.

  • References

    1. Abdulkadir, A.G and Jomoh, W.L.O. (2013). Comparative analysis of physicochemical properties of extracted and collected palm oil and Tallow, Chem- Research Journal, 4(2):44-45.
    2. Adelaji, J.O. (2006). Evaluation of mineral constituents and physicochemical properties of some oil seed. MSc. Industrial Chemistry, University of Ibadan, Ibadan (Unpublished).
    3. Adepoju-Bello, A.A., Osagiede, S.A. and Oguntibeju, O.O. (2012). Evaluation of the concerntation of some toxic metals in the dietary palm. Journal of Bwanalysis and Bio-medicine 5(2):131-140.
    4. Akanni, M.S., Adekunle, S.A. and Oluyemi, E.A. (2005). Physico-chemical properties of some non-conventional oil seeds, Journal Food Technology, (3):177-181.
    5. Akinola, F.F., Oguntibeju, O.O., Adisa, A.W. and Owojuyibe; O.S. (2010). Physico-chemical properties of palm oil from different palm oil local factories in Nigeria. Journal of Food Agriculture and Environment, 8(3&4):264-269.
    6. Association of Official Analytical Chemists. A.O AC. (1990). Official methods of Analysis 15th ed. Association of Official Chemists Washington DC.
    7. Cahoon, E.B., Clemente, T.E. Damude, H.G. and Kinney, A.J. (2000). Modifying vegetable oils for food and non-food purpose in oil crops. Springer New York, 31-56. https://doi.org/10.1007/978-0-387-77594-4_2.
    8. Faessler, K. (2004). Advanced Fractionation for the Ole chemical industry. Oil and fat conference www.wikipedia.com. Retrieved on 25:07:2008.
    9. Giguere, A., Campbell, P.G., Hare, L. and Couture, P. (2006). Sub-cellular portioning of cadmium, copper, nickel and zinc in indige-nous yellow perch (Perca flavescent) sampled along a polymetallic gradient Aquatic Toxicology, 77(2):178-189. https://doi.org/10.1016/j.aquatox.2005.12.001.
    10. Ichu, C.B. and Nwakanma, H.O. (2020). Comparative study of the physicochemical characterization and quality of editable vegetable oils. International Journal of Research in Informative Science Application and Technique, 3(2):19321-19329. https://doi.org/10.46828/ijrisat.v3i2.56.
    11. International Union of Pure and Applied Chemistry, IUPAC (1987). Standard methods for the analysis of oils, fats and derivatives, 7th edition. Blackwell Scientific Publication Oxford, England, 56-62.
    12. Kardash, E. and Turyan, Y.I. (2005). Acid value determination in vegetable oils by indirect titration in aqueous-alcohol media. Croati-ca Acta, 78(1):99-103.
    13. Nielsen, S.S. (2002). Introduction to the chemical Analysis of Food, 183-204.
    14. Nordstorm, D.K. and Alpers, C.N. (1999). Negative pH, efflorescent mineralogy and consequences for environmental restoration at the iron mountain super fund site, California. Proceeding of the National Academic of Science, 96(7):3455-3462. https://doi.org/10.1073/pnas.96.7.3455.
    15. Oguntibeju, O.O., Esterhuse, A. J. and Truter, E.J. (2009). Red palm oil; Nutritional physiological and therapeutic roles in moving hu-man wellbeing and quality of life British Journal of Biomedical Sciences, 66(4):216-222. https://doi.org/10.1080/09674845.2009.11730279.
    16. Okogeri, O. (2013). Adulteration of crude palm oil with red dye from the leaf or sorghum bicolor. Food Science and Quality Manage-ment, (17):1-6.
    17. Orji, M.U. and Mbata, T.I. (2008). Effect of characterization methods on the quality and spoilage of Nigerian palm oil. African Journal of Biochemistry Research, 2(9):192-196.
    18. Standard Organization of Nigeria (SON, 2000) Standards for edible palm oil and tallow Eds.
    19. Turner R. (2010). Fats and oils quality characteristics extraction and refining overview. Farm energy conference, Manchester. www.uvm.edu/extension. cropsoil/wp-content/uploads/turner-refining.pdf. Retrieved on 12:01;2014.
    20. World Health Organization/Food and Agricultural organization, WHO/FAO (2010) Journal of Nutrition. https//doi.org/10:1017/500071145-1200245. Retrieved on 14:02:2019

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    J. R, G. ., O. A, O. ., & L. A, R. . (2024). Comparative analysis of the physicochemical properties and trace metal content of palm oil, from selected markets in Jos south and Jos north LGA, Plateau state, Nigeria: Comparative Analysis of the Physico-Chemical Properties and Trace Metal Content of Palm Oil. International Journal of Advanced Chemistry, 12(2), 71-76. https://doi.org/10.14419/nrn2tt65