Research Article

ASSESSMENT OF THE MICROBIOLOGICAL STATUS OF SOME COMMERCIAL YOGHURT BRANDS SOLD IN OWERRI METROPOLIS, IMO STATE, NIGERIA

Chikwendu, C. L1*, Obi, R. K2, Amadi, E.S2
1 Department of Microbiology, Federal University of Technology, P. M. B. 1526 Owerri, Imo State Nigeria
2 Dept. of Microbiology, Federal University of Technology Owerri, Nigeria
* Corresponding author: chinwe.chikwendu@yahoo.com
Published: Jun, 2015
DOI: 10.67614/njm.2015.43fmnjur
Pages: 2872-2877

Abstract

An assessment of the microbiological quality of seven commercial brands of yoghurt drinks sold in Owerri metropolis was determined using standard microbiological procedures. The physical parameters of the brands at time of purchase were also determined. The results showed that the pH values of the samples ranged from 4.29-4.46, while their temperature readings were between 8 and 17°c. While average total heterotrophic counts rang ed from 2.00x105 to 2.04x106cfu/ml, average coliform counts were from 8.0x104 to 2.01xl06cfu/ml and average total fungal counts ranged from 3.5xl05 to 2.5xl06sfu/ml. Four bacterial genera were identified among the isolates and included Escherichia coli, Staphylococcus aureus, Streptococcus spp. and Lactobacillusspp. The fungal genera identified were Candida albicans, Aspergillusfumigatus, Aspergillusglaucusand Saccharomyces cerevisiae.Escherichia coli were isolated from all the seven yoghurt brands sampled. The result of this study therefore indicated poor Microbiological standards of commercial yoghurts sold in Owerri metropolis at the time of this research. This result underlines the need for improved hygienic measures in the processing, storage and distribution of these products to avert public health challenges

Keywords

Yoghurt microbiological safety public health microbiological status physical parameters.

References

  1. Adams, M. R. and Moss, M. O. (1995). Food Microbiology. 4th ed. The Royal Society of Chemistry, Cambridge, UK. Pp. 263 – 266.
  2. Arnott, B. M., Zentmyer, G. A. and Nishijima, W. T. (1997). Microbial Analysis of Food. 3rd ed. Longman Science, Essex, UK. Pp. 721 – 723.
  3. Chandan, R. C. (2006). History and Consumption Trends. In: Chandan R. C. (Ed). Manufacturing Yogurt and Fruit Milks. Blackwell Publishing, Oxford UK. Pp. 3-15.
  4. De, N., Goodluck, T. M. and Bobai, M. (2014). Microbiological quality assessment of bottled yogurt of different brands sold in central market Kaduna Metropolis, Kaduna, Nigeria. International Journal of Current Microbiology and Applied Science, 3(2): 20-27.
  5. FAO (1979). Food and Agriculture Organisation. Manual of food quality control. 4 microbiological Analysis. FAO food and nutrition paper, FAO Italy paper, 14 (4): C3 – C5, D2.
  6. Fleet, G. (1990). Yeasts in dairy products. Journal of Applied Bacteriology, 68: 199 – 211.
  7. Fleet, G. (1992). Spoilage yeasts. Critical Review in Biotechnology, 12: 1 – 44.
  8. Foschino, R., Garzarolli, C., Ottogli, G. (1993). Microbial contaminants cause swelling and inward collapse of yoghurt packs. LeLait, 73: 395 – 400.
  9. Frazier, W. C. and Westhoff, D. C. (1978). Food Microbiology. 5th ed. Tata McGraw Hill Publi. Company Ltd, New York. p.540.
  10. Habibu, U. A. and Mukhtar, M. D. (2002). Comparative study on microbial contaminants of hand and machine sealed "zobo" drink of hibiscus sabdariffa. Nigerian Journal of Research and Production, 1(3): 127 – 137.
  11. Ifeanyi, V. O., Ihesiaba, E. O., Muomaife, O. M. and Ikenga, C. (2013). Assessment of Microbiological Quality of Yoghurt sold by Street Vendors in Onitsha Metropolis, Anambra State, Nigeria. British Microbiology Research Journal, 3(2): 198-205.
  12. Moreira, S. R., Schaeaen, R. F., de Carvalho, E. P., Wheats, A. E. (2001). Isolation and identification of yeasts and filamentous fungi from yoghurts in Brazil. Brazilian Journal of Microbiology, 32: 117 – 122.
  13. Mukhtar, M. D., Oyeyi, T. I. and Kawo, A. H. (2001). A retrospective study of enteric infections in Kano State between 1985 and 1996. NISEB Journal, 1(1): 61 – 70.
  14. Nduka, U. (2004). Public Health Food and Industrial Microbiology. 3rd ed. BOBPECO Publi. Benin, Nigeria, p.307.
  15. Okpala, N. N. and Jideani, I. A. (2006). Comparative study of microbial quality of commercial and laboratory produced yoghurts. Nigerian Journal of Microbiology, 20(2): 917 – 926.
  16. Onuorah, S. I. and Adekeye, J. O. (1979). Occurrence of Staphylococcus aureus and coliforms in "kunun-zaki" and utensils used in its preparation, Samaru Zaria. Journal of Food and Agriculture, 1: 31 – 34.
  17. Perdigon, G., Alvarez, S., Rachiedm, M., Agüero, G. and Gobbato, N. (1995). Immune System Stimulation by Probiotics. Journal of Dairy Science, 78:1597-1606.
  18. Philip, L. C. (1977). Food and water – borne diseases. Microbiology. 4th edn. W. B. Saunders Publi. London, p 401.
  19. Prescott, L. M., Harley, J. P. and Klein, D. A. (2008). Microbiology. 7th ed. McGraw Hill Publi. Boston, New York. Pp. 1038-1040.
  20. Serra, M., Trujillo, J.A., Guamis, B. and Ferragut, V. (2009). Flavor profiles and survival of starter cultures of yogurt produced from high pressure homogenized milk. International Dairy Journal, 19:106-109.
  21. Taura, D. W., Mukhtar, M. D. and Kawo, A. H. (2005). Assessment of microbial safety of some brands of yoghurt sold around old campus of Bayero University, kano. Nigerian Journal Microbiology, 19(1-2): 521 – 528.
How to Cite

L, C. C., K, O. R., & E.S, A. (2015). ASSESSMENT OF THE MICROBIOLOGICAL STATUS OF SOME COMMERCIAL YOGHURT BRANDS SOLD IN OWERRI METROPOLIS, IMO STATE, NIGERIA. Nigerian Journal of Microbiology, 28(1), 2872-2877. https://doi.org/10.67614/njm.2015.43fmnjur

C. C. L, O. R. K, and A. E.S, "ASSESSMENT OF THE MICROBIOLOGICAL STATUS OF SOME COMMERCIAL YOGHURT BRANDS SOLD IN OWERRI METROPOLIS, IMO STATE, NIGERIA," Nigerian Journal of Microbiology, vol. 28, no. 1, pp. 2872-2877, June 2015. doi: 10.67614/njm.2015.43fmnjur

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