MICROBIOLOGICAL QUALITY ASSESSMENT OF COMMERCIALLY PREPARED YOGHURT RETAILED IN SOKOTO STATE, NORTHWESTERN NIGERIA.

Authors

  • Salisu, M. D. National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,
  • Junaidu, A. U. Faculty of Veterinary Medicine, Usmanu Danfodiyo University, Sokoto.
  • Mohammed, A. K. National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,
  • Lamidi, O. S. National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,
  • Suleiman, A. National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,
  • Mustapha, H. National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,
  • Yusuf, M. National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,
  • Sani, R. T, National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,
  • Wunti, Z. M. National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,

Keywords:

Aerobic plate count, Coliform, Yoghurt, pH.

Abstract

Microbiological quality of six brands (18 samples) of yoghurt sampled from retail outlets in
Sokoto, North-western Nigeria were evaluated for the level of quality measures used by the
producers and their wholesomeness for human consumption.
The mean pH value of the yoghurt samples ranges from 3.69-4.50. The mean total aerobic plate
count (TAPC) was 3.37 x 104 cfu/ml while the range was 2.66 x 104 ± 8.3 x 103 to 1.13 x 105 ±
1.17 x 105cfu/ml of yoghurt. There was no significant difference (P>0.05) in the cfu/ml between
the six yoghurt brands analysed.
The aerobic plate mesophilic bacteria isolated were Lactobacillus spp and Streptococcus spp
while E. coli an indicator for coliforms was not detected in any of the samples. The findings of
this study indicates that the bacterial load of some commercially produced yoghurt sold in
Sokoto were within the recommended safe limits of 1.0 – 3.5 x 105 cfu/ml for human
consumption.

Published

2016-12-30