title: Antibacterial and antiproliferative peptides in synbiotic yogurt-Release and stability during refrigerated storage.
abstract: The search for alternative therapeutics is on the rise due to the extensive increase in bacterial resistance to various conventional antibiotics and side effects of conventional cancer therapies. Bioactive peptides released from natural sources such as dairy foods by lactic acid bacteria have received attention as a potential source of biotherapeutic peptides. However, liberation of peptides in yogurt depends on proteolytic activities of the cultures used. Thus, this research was conducted to establish generation of inhibitory peptides in yogurt against pathogenic bacteria and cancer cells during storage at 4°C for 28d. Water-soluble crude peptide extracts were prepared by high-speed centrifugation of plain and probiotic yogurts supplemented with or without pineapple peel powder (PPP). The inhibition zones against Escherichia coli and Staphylococcus aureus by PPP-fortified probiotic yogurt at 28d of storage were, respectively, 25.89 and 11.72mm in diameter, significantly higher than that of nonsupplemented control yogurts. Antiproliferative activity against HT29 colon cancer cells was also significantly higher in probiotic yogurt with PPP than in nonsupplemented probiotic yogurt. Overall, crude water-soluble peptide extracts of the probiotic yogurt with PPP possessed stronger inhibitory activities against bacteria and cancer cells than controls, and these activities were maintained during storage. However, activities were lowered substantially during in vitro gastrointestinal digestion. These findings support the possibility of utilizing dairy-derived bioactive peptides in the development of a superior alternative to the current generation of antibacterial and anticancer agents, as well as a functional ingredient in foods, nutraceuticals, and pharmaceuticals.
authors.affiliation: Advanced Food Systems Research Unit, College of Health and Biomedicine, Victoria University, Werribee Campus, PO Box 14428, Melbourne, Victoria 8001, Australia.
authors.forename: B N P
authors.initials: BNP
authors.lastname: Sah
authors.affiliation: Advanced Food Systems Research Unit, College of Health and Biomedicine, Victoria University, Werribee Campus, PO Box 14428, Melbourne, Victoria 8001, Australia.
authors.forename: T
authors.initials: T
authors.lastname: Vasiljevic
authors.affiliation: Advanced Food Systems Research Unit, College of Engineering and Science, Victoria University, Werribee Campus, PO Box 14428, Melbourne, Victoria 8001, Australia.
authors.forename: S
authors.initials: S
authors.lastname: McKechnie
authors.affiliation: Advanced Food Systems Research Unit, College of Health and Biomedicine, Victoria University, Werribee Campus, PO Box 14428, Melbourne, Victoria 8001, Australia. Electronic address: Osaana.Donkor@vu.edu.au.
authors.forename: O N
authors.initials: ON
authors.lastname: Donkor
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents; D010455:Peptides; D019936:Probiotics / Q000737:chemistry; D013211:Staphylococcus aureus; D058616:Synbiotics; D015014:Yogurt / Q000382:microbiology*
chemical_list: D000900:Anti-Bacterial Agents; D010455:Peptides
keywords: antibacterial activity; anticancer activity; peptides; pineapple; probiotics