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Antibacterial Activity of Probiotic Yoghurt and Soy-Yoghurt against Escherichia coli and Staphylococcus aureus
| Content Provider | Semantic Scholar |
|---|---|
| Author | Abdel-Gawad, Ia El-Sayed, Ezzat El-Zeini, Hm Hafez, Salam M. El Saleh, Fatimah M. |
| Copyright Year | 2016 |
| Abstract | Introduction: Biopreservation systems in food are becoming increasingly interesting for the industry and consumer. Methods: Yoghurt milk and soymilk samples were inoculated separately with E.coli or S. aureus immediately after adding the starter (bifidobacteria and/or yoghurt culture) to investigate the antimicrobial activity of probiotic yoghurt and soy-yoghurt. Results: Probiotic yoghurt containing Bifidobacterium lactis (Bb-12) and Bifidobacterium longum (Bb-46) exhibited a slight pH drop compared with plain yoghurt (without bifidobacteria) during the refrigerated storage period. Plain yoghurt and probiotic yoghurt containing Bb-12 and Bb-46 inoculated with or without test organisms showed a significant (P<0.05) increase in lactic and acetic acids than the probiotic soy-yoghurt containing Bb-12 and Bb-46 which produces not only lactic and acetic acids but also formic acid. From the initial count of E.coli, % decreases were 96.00, 99.43, 99.14, 97.14 and 98.43%, for the plain yoghurt, probiotic yoghurt containing Bb-12 & Bb-46 and soy-yoghurt containing Bb-12 and Bb-46, respectively. E. coli counts were disappeared in probiotic yoghurt, soyyoghurt and plain yoghurt after 2, 3 and 5 days of storage, respectively .The decrease percentage for the plain yoghurt, probiotic yoghurt containing Bb-12 and Bb-46 and soy-yoghurt containing Bb-12 & Bb-46 were 85.62, 93.36, 95.58, 93.36 and 95.58 from the initial inoculum level, respectively. The growth of S.aureus was not detected in the probiotic yoghurt containing Bbl 2 and Bb-46 after the 10th day of storage. Low numbers of S.aureus survived in the plain yoghurt and probiotic soy-yoghurt Bb12 and Bb-46, after 15 days of cold storage. Conclusion: According to this data probiotic yoghurt, Soy-yoghurt and their antibacterial metabolites can be used to control pathogenic microorganisms |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.omicsonline.org/open-access/antibacterial-activity-of-probiotic-yoghurt-and-soyyoghurt-against-escherichia-coli-and-staphylococcus-aureus-2155-9600.1000303.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Acids Anti-Bacterial Agents Bacteria Bifidobacterium animalis Cryopreservation Metabolite Microorganism Probiotics SOY ISOFLAVONES Soybean Oil Soybeans Staphylococcus aureus enterotoxin B Ab.IgE:ACnc:Pt:Ser:Qn Yogurt formic acid negative regulation of defense response to bacterium |
| Content Type | Text |
| Resource Type | Article |
