Cyanide and Heavy Metal Concentration of Fermented Cassava Flour (Lafun) Available in the Markets of Ogun and Oyo States of Nigeria

Authors: Adebayo-Oyetoro A. O., Oyewole O. B., Obadina A. O, Omemu M. A.

Abstract:

Fermented cassava flours (lafun) sold in Ogun and Oyo States of Nigeria were collected from 10 markets for a period of two months and analysed to determine their safety status. The presence of trace metals was due to high vehicular movement around the drying sites and markets. Cyanide and moisture contents of samples were also determined to assess the adequacy of fermentation and drying. The result showed that sample OWO was found to have the highest amount of 16.02±0.12mg/kg cyanide while the lowest was found in sample OJO with 10.51±0.10mg/kg. The results also indicated that sample TVE had the highest moisture content of 18.50±0.20% while sample OWO had the lowest amount of 12.46±0.47%. Copper and lead levels were found to be highest in TVE with values 28.10mg/kg and 1.1mg/kg respectively, while sample BTS had the lowest values of 20.6mg/kg and 0.05mg/kg respectively. High value of cyanide indicated inadequate fermentation.

Keywords: Cyanide, fermented, heavy metal, lafun.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1087253

References:

[1] Ano, A.O. (2003): Studies on the effect of Liming on the Yield of two cassava cultivars. In: NRCRI Annual Report 2003: 9
[2] Egesi, C., Mbanaso, E., Ogbe, F., Okogbenin, E. and Fregene, M (2006). Development of cassava varieties with high value root quality through induced mutations and marker-aided breeding. NRCRI, Umudike Annual Report 2006: 2-6
[3] Ugwu B.O and Ukpabi U.J (2002): Potential of soy-cassava flour processing to sustain increasing production in Nigeria. Outlook on Agriculture 31(2): 129-133
[4] Oluwole, O. B.; Olatunji, O. O. and Odunfa, S. A. (2004): A process technology for conversion of dried cassava chips into gari. Journal of Food Science and Technology 22: 65 -77
[5] Bradbury J.H, A Cumbana, Mirione E, Cliff J (2007): Reuction of cyanide content of cassava flour in Mozambique by the wetting method. Food Chemistry 101: 894-897.
[6] Onwuka G.I and Ogboju N.J (2007): Effect of Fermentation on the quality and Physicochemical Properties of cassava Based Fufu Products made from Two cassava Varieties NR8212 and Nwangbisi. Journal of Food Technology 5 (3): 261-264.
[7] Oyewole, O.B. and Sanni, L.O (1995): Constraints in traditional cassava food processing: The case of fufu production. In Cassava Food Processing, (T. Agbor Egbe, A. Bauman, T. Griffon and S. Treche, eds.) pp. 523–529, ORSTOM, France.
[8] Padonou S.W, Hounhouigan J.D, Nago M.C (2009). Physical, chemical and microbiological characteristics of lafun produced in Benin. African Journal of Biotechnology 8(14): 3320-3325.
[9] Das, A., (1990). Metal ion induced toxicity and detoxification by chelation therapy. In: 1st(ed) A text book on medical aspects of bioinorganic chemistry, CBS, Delhi, p. 17-58
[10] Onwuka, G.I., 2005. Food Analysis and Instrumentation (Theory and Practice). 1st Edn., Napthali Prints, Surulere, Lagos-Nigeria, pp: 140- 160.
[11] AOAC (2001): Association of Official Analytical Chemist. Official Method of Analysis. 17th ed. AOAC Press, Gaithersburg, USA.
[12] Edem Christopher A., Grace Iniama, Vincent Osabor, Rebbeca Etiuma and Matilda Ochelebe, (2009). A Comparative Evaluation of Heavy Metals in Commercial Wheat Flours Sold in Calabar-Nigeria. Pakistan Journal of Nutrition, 8: 585-587.
[13] FAO/WHO. (1991). Joint FAO/WHO Food standards programme. Codex Alimentarius Commission XII (Suppl. 4). Rome; FAO.
[14] Sanni L, B. Maxiya-Dixon, J.Akanya, C.I Okoro, Y. Alaya, C.V Egwuonwu, R. Okechukwu, A.Dixon (2005): Standards for cassava products and guidelines for export. IITA, Ibadan, Nigeria. Pp23.
[15] Dhas P.K, Chitra P and Mary A.R (2011). Study on the Effect of hydrogen cyanide exposure in cassava workers Indian J Occup Environ Med. 15(3):133-6.
[16] Hamel J: A (2011). Review of Acute Cyanide Poisoning with a treatment Update. Critical Care Nurse: 3(1): 72-82
[17] Sanni L, B. Maxiya-Dixon, J.Akanya, C.I Okoro, Y. Alaya, C.V Egwuonwu, R. Okechukwu, A.Dixon (2005): Standards for cassava products and guidelines for export. IITA, Ibadan, Nigeria. Pp23.
[18] Obadina, A.O., Oyewole, O.B. and Archibong, U.E. (2011). Short Communication. Effect of processing on the qualities of noodles produced from corn grit and cassava flour. International Food Research Journal 18(4): 1563-1568.
[19] Magomya, A.M., Yebpella, G.G., Udiba, U.U.,Amos, H.S and Latayo, M.S. (2013). Potassium Bromate and Heavy Metal Content of Selected Bread Samples Produced in Zaria, Nigeria International Journal of Science and Technology Volume 2 No. 2. 232-237
[20] Salama, A.K. and M.A. Radwan,( 2005). Heavy metals (Cd, Pb) and trace elements (Cu, Zn) contents in some foodstuff from the Egyptian market. Emirate J. Food Agric., 17: 34-42.
[21] USDA (2003). Zinc in foods draft for comments. Foreign Agricultural Service (GAIN Report) CH3043.
[22] Uchino T, Roychowdhury T, Ando M, Tokunaga H. (2006). Intake of arsenic from water, food composites and excretion through urine, hair from a studied population in West Bengal, India. Food Chem Toxicol. 44(4):455-61.
[23] Obanijesu E.O and J.O Olajide (2009): Trace Metal Pollution Study on Cassava Flour’s Roadside Drying Technique in Nigeria. Appropriate Technologies For Protection In developing World, VI, 333-339.
[24] Joint FAO/WHO Food Standards Programme CODEX Alimentarius Commission. Eighteenth Session Geneva 3-14 July 1989.
[25] Jarup, L., Hazards of heavy metal contamination (2003) Br Med Bull; 68: 167-82.