Evaluation of microbiological quality of raw milk, sour milk and artisanal yoghurt from Ouagadougou, Burkina Faso

Abstract

The present study was undertaken to investigate the microbiological quality of milk and artisanal dairy products sold in Ouagadougou markets. Forty-five (45) samples of milk and dairy products including raw milk, sour milk and yoghurt were collected and analyzed for aerobic mesophilic bacteria (AMB), total coliforms (TC), thermotolerant coliforms (TTC), Staphylococcus aureus (S. aureus), lactic acid bacteria (LAB) and yeasts and moulds (YM). The coliforms bacteria were then purified and identified by using API 20E system. The mean values of TC, TTC, S. aureus LAB and YM in the raw milk were 8.95, 6.43, 6.21, 4.83, 8.01 and 4.78 log cfu mL -1 respectively, In sour milk they were 10.44, 5.62, 4.12, 6.98, 7.38 and 3.75 log cfu mL -1 respectively, while in yoghurt samples the mean values of TC, TTC, S. aureus LAB and YM were 9.98, 5.77, 5.50, 6.12, 9.78 and 4.86 log cfu mL -1 respectively. The dominant coliforms isolated from raw milk, sour milk and yoghurt samples were found to be Escherichia coli, Klebsiella pneumonia and Enterobacter cloacae. Citrobacter spp was not found in any of the analyzed samples. The wide range of the samples analyzed did not comply with the standards quality. Thus it is necessary to set up an awareness program including capacity building of all the actors working in the sector of milk and dairy products.

Raw cow milk nutritional content and microbiological quality predictors of South Gondar zone dairy farmers in Ethiopia, 2020

“…The result of S. aureus was 8 ± 0.2log CFU/100mL-1. This finding is higher than the acceptable limit set by the EU (absence in 1 ml) [ 29 ]. This may be attributed to these microorganisms contaminating raw cow milk through the poor hygienic condition of the milker, contaminated water supplies, not clipping, brushing, cleansing, and sanitizing udder, milking area, and milk utensils before milking.…”

“…The mean value of Yeast in raw cow milk is also higher than a result found in DawaChefe (0.46log CFU/100mL-1) [ 27 ], Eastern Ethiopia (3 ± 0.1log CFU/100mL-1) [ 30 ], and Addis Ababa (4 ± 0.5log CFU/100mL-1) [ 24 ]. The mean value of Yeast and Mold reported in this paper was higher than the limit allowed by the EU 2004 (5 log CFU/mL-1) [ 29 ].…”

“…mean E. coli value of this finding is higher than the result obtained from the rift valley of Ethiopia (4 ± 0.1 log CFU/100mL-1), Addis Ababa (5 ± 2 log CFU/100mL-1) [ 24 ], East Wollega (7log CFU/100mL-1) [ 23 ], Dawachefe, Ethiopia (5log CFU/100mL-1) [ 27 ] and Bench Maji-Zone, Ethiopia (5 ± 0.3log CFU/100mL-1) [ 28 ]. Moreover, the current result of the mean TC value was higher than the limit allowed by EU (5logsCFU/100mL-1) [ 29 ].…”