INHIBITION OF SOME PATHOGENS IN FERMENTED MILK BY ZABADY STARTER | ||||
| Journal of Food and Dairy Sciences | ||||
| Article 9, Volume 25, Issue 7, July 2000, Page 4401-4411 PDF (792.61 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jfds.2000.259202 | ||||
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| Authors | ||||
| T. S. M Shady,1; M. M. Zin El-Din2; Fatma A. Fathi3 | ||||
| 1Microbiol. Dept., Soil, Water and Environ. Res. Institute, Agric. Res. Center, Giza, Egypt. | ||||
| 2Dairy Dept., Fac. of Agric., Mansoura Univ., Mansoura, Egypt. | ||||
| 3Food Technol. and Dairy Dept., National Res. Center, Dokki, Cairo, Egypt. | ||||
| Abstract | ||||
| The inhibition of some undesirable microorganisms namely Escherichia coli, Staphylococcus aureus, Salmonella typhimurium, Listeria monocytogenes and Bacillus cereus in fermented milk (Zabady) by mixed cultures of yoghurt (Streptococcus salivarius subsp. thermophilus and Lactobacillus delbreuckii subsp. bulgaricus) was studied. Results of this study revealed that acidity of Zabady treatments increased, while pH values decreased throughout storage period. The rates of increasing acidity and decreasing pH values were higher in treatments stored at room temperature than those stored at 5-7°C. Counts of target organisms declined sharply in the presence of lactic starter. The rate of disappearance at room temperature was higher than that at 5-7°C. The inhibition zone varied with the different target organisms. Supernatant obtained from the harvest of lactic culture incubated at room temperature had higher inhibitory effect than that at 5-7°C. Non boiled fluid had greatest effect than boiled extracts. | ||||
| Keywords | ||||
| Lactic acid bacteria (LAB); inhibition; target; yoghurt; Listeria; Escherichia; Staphylococcus; Salmonella; Bacillus | ||||
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