Author/Authors :
Haghshenas، Babak نويسنده Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran. , , Haghshenas، Minoo نويسنده School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran. , , Nami، Yousef نويسنده Institute of Biosciences, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. , , Yari Khosroushahi، Ahmad نويسنده Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran. , , Abdullah، Norhafizah نويسنده Chemical and Environmental Engineering Department, Faculty of Engineering, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. , , Barzegari، Abolfazl نويسنده Research Center of Pharmaceutical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran. , , Rosli، Rozita نويسنده Institute of Biosciences, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. , , Hejazi، Mohammad Saeed نويسنده Tabriz University of Medical Sciences, Faculty of Pharmacy, Tabriz, Iran. ,
Abstract :
Purpose: Probiotics are microorganisms, which show beneficial health effects on hosts once consumed in sufficient amounts. Among probiotic bacteria, the bioactive compounds from lactic acid bacteria (LAB) group can be utilized as preservative agents. LAB group can be isolated and characterized from traditional dairy sources. This study aimed to isolate, identify, and biologically characterize probiotic LAB strains from Iranian traditional dairy products. Methods: A total of 19 LAB strains were identified by sequencing of their 16S rRNA genes. They were examined for adherence to human intestinal Caco-2 cells and tolerance to low pH/high bile salts and simulated in vitro digestion conditions. Moreover, they were evaluated further to assess their ability to prevent the adhesion of Escherichia coli 026 to the intestinal mucosa, inhibitory functions against pathogens, and sensitivity to conventional antibiotics. Results: L. plantarum 15HN and E. mundtii 50H strains displayed ? 71% survival rates at low pH/high bile salts and ? 40% survival rates in digestive conditions. Their adherences to Caco-2 cells were 3.2105 and 2.6105 CFU mL-1 respectively and high values of anti-adhesion capability were observed (?36%). They inhibited the growth of 13 and 11 indicator pathogens respectively. Moreover, they were sensitive or semi-sensitive to seven and three out of eight antibiotics respectively. Conclusion: L. plantarum 15HN and E. mundtii 50H, which were isolated from shiraz product, displayed above-average results for all of the criteria. Therefore, they can be introduced as novel candidate probiotics that could be used in the food industry.
