Enhancing the Hygienic Quality of Some Ghanaian Food Products by Gamma Irradiation

Abstract

The microbiological quality (microbial load and profile) of 6 Ghanaian food products was determined before and after irradiation (0 kGy, 5 kGy, 7.5 kGy, 10 kGy) using standard microbiological methods. The microbial load was estimated by the total viable count (TVC) and moulds and yeasts count (MYC). The range of TVC and MYC of the un-irradiated products were 103 cfu/g - 106 cfu/g and 0 cfu/g - 106 cfu/g respectively. Un-irradiated Banku Mix Powder, Fermented Maize Powder and Cassava Dough Powder had relatively low microbial load (TVC ? 6.1 × 103 cfu/g; MYC ? 4.9 × 102 cfu/g). Un-irradiated Fermented Maize Dough, Kokonte Powder and Cassava Dough had relatively high TVC of >106 cfu/g. Eleven and 3 microbial isolates were detected in the un-irradiated and irradiated products respectively and the most common were Aspergillus niger and Bacillus spp. Irradiation dose of 10 kGy eliminated all microorganisms from the products. Doses of 5 and 7.5 kGy reduced the microbial loads of the products by approximately 1 to 6 log cycles to meet national and international standards. The use of low dose gamma radiation by the local food industry could improve the hygienic quality, extend shelf-life and enhance the competitiveness of the Ghanaian food products in domestic and export markets.

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A. Adu-Gyamfi and V. Appiah, "Enhancing the Hygienic Quality of Some Ghanaian Food Products by Gamma Irradiation," Food and Nutrition Sciences, Vol. 3 No. 2, 2012, pp. 219-223. doi: 10.4236/fns.2012.32032.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] United Nations Industrial Development Organization, “Food Processing Technologies for Africa,” In: H. A. Dirar, Ed., UNIDO, Vienna, 1997.
[2] A. Reilly and A. Westby, “Food Fermentations—Traditional Low-Cost Food Preservation Systems,” In: H. A. Dirar, Ed, Food Processing Technologies for Africa, UNIDO, Vienna, 1997.
[3] R. D. Pace, W. A. Plahar and J. Y. Lu, “Status of Traditional Food Preservation Methods for Selected Ghanaian Foods,” Foods Review International, Vol. 5, No. 1, 1989, pp. 1-12. doi:10.1080/87559128909540842
[4] M. J. R. Nout, F. M. Rombouts and A. Havelaar, “Effect of Accelerated Natural Lactic Fermentation of Infant Food Ingredients on Some Pathogenic Bacteria,” International Journal of Food Microbiology, Vol. 8, No. 4, 1989, pp. 351-361. doi:10.1016/0308-8146(95)00155-7
[5] S. K. Mbugua and I. Njenga, “Anti-Microbial Properties of Fermented Uji as a Weaning Food,” In: A. Westby and P. J. A. Reilly, Eds., Proceedings of a Regional Workshop on Traditional African Foods—Quality and Nutrition. 25-29 November 1991, Stockholm, 1992, pp. 63-68.
[6] L. Jesperson, M. Halm, K. Kpodo and M. Jakobsen, “The Significance of Yeasts and Moulds Occurring in Maize Dough Fermentation for ‘Kenkey’ Production,” International Journal of Food Microbiology, Vol. 24, No. 1-2, 1994, pp. 293-298.
[7] P. Wareing, “Report on a Visit to Ghana to Determine the Incidence and Extent of Mould and Mycotoxin Contamination in Cassava Products,” NRI Report R2011, Falls Church, 1993.
[8] K. A. Kpodo, A. K. Sorenson and M. Jacobsen, “The Occurrence of Mycotoxins in Fermented Maize Products,” Food Chemistry, Vol. 56, No. 20, 1996, pp. 147153. doi:10.1016/0308-8146(95)00155-7
[9] D. L. Eaton and J. D. Groopman, “The Toxicology of Aflatoxins. Human Health, Veterinary and Agricultural Significance,” Academic Press, San Diego, 1994.
[10] F. P. Guengerich, W. W. Johnson, Y. F. Veng and T. Shimade, “Involvement of Cytochrome P450, Glutathione S-Transferase and Epoxide Hydrolase in the Metabolism of Aflatoxin B1 and Relevance to Risk of Human Liver Cancer,” Environmental. Health Perspectives, Vol. 104, 1996, pp. 557-562.
[11] J. Farkas, “Irradiation of Dry Food Ingredients,” CRC Press Inc., Boca Raton, 1988, pp. 39-44,67-69.
[12] Council for Agricultural Science and Technology (CAST), “Radiation Pasteurisation of Food,” Issue Paper No. 7, CAST, Ames, 1996.
[13] International Atomic Energy Agency (IAEA), TECDOC639, Vienna, 1992.
[14] American Society for Testing and Materials (ASTM), “Standard Guide for Irradiation of Spices, Herbs and Vegetable Seasoning to Control Pathogens and other Microorganisms,” ASTM Standard F 1885-98, Denver, 1998.
[15] American Public Health Association (APHA), “Compendium of Methods for the Microbiological Examination of Foods,” In: M. K. Speck, Ed., American Public Health Association, Washington DC, 1996.
[16] J. F. MacFaddin, “Biochemical Tests for Identification of Medical Bacteria,” Williams and Wilkins, Baltimore, 1980.
[17] J. C. Gilman, “A Manual of Soil Fungi,” Iowa State University Press, Annes, 1957.
[18] Ghana Standards, Reference No. GS 210, Ghana Standards Board, Accra, 1998.
[19] Y. S. Lewis, “Spices and Herbs for the Food Industry,” Food Trade Press, Orpington, 1984.
[20] Ghana Standards, Reference Nos. GS 235: 1997; GS236: 1997. Ghana Standards Board, Accra, 1997.

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