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http://dx.doi.org/10.48022/mbl.2110.10008

Anti-Hemolytic and Antimicrobial Effects against Multidrug-Resistant Bacteria of Enterococcus faecalis Isolated from Human Breast Milk  

Yi, Eun-Ji (Department of Alternative Medicine, Kyonggi University)
Lee, Jeong-eun (Department of Alternative Medicine, Kyonggi University)
Jo, So-Yeon (Department of Food and Nutrition, Baewha Women's University)
Kim, Soo-bin (Department of Food and Nutrition, Chung-Ang University)
Yu, Du-na (Department of Biotechnology, Kyung Hee University)
Kook, Moochang (Department of Food and Nutrition, Baewha Women's University)
Kim, Ae Jung (The Graduate School of Alternative Medicine, Kyonggi University)
Publication Information
Microbiology and Biotechnology Letters / v.49, no.4, 2021 , pp. 519-527 More about this Journal
Abstract
In this study, the hemolysis of Enterococcus faecalis BMSE-HMP strains, isolated from human breast milk, was investigated, and the anti-hemolytic and antimicrobial effects on multidrug-resistant (MDR) bacteria were investigated. The enzyme activity of E. faecalis BMSE-HMP 4 strains was measured, and it was found that the activities of esterase and esterase lipase were the highest. In addition, no hemolytic reaction was observed in any of the isolates. Subsequently, the anti-hemolytic activity against MDR strains causing hemolysis was evaluated. E. faecalis BMSE-HMP002 had the highest anti-hemolytic activity against Staphylococcus aureus CCARM 3855 at 75.71 ± 10.00%. The anti-hemolytic activity against Escherichia coli DC 2 CCARM 0238 and Pseudomonas aeruginosa CCARM 0223 showed that the activity of BMSE-HMP001 was highest at 76.92 ± 2.99% and 87.93 ± 1.93%, respectively. Examination of the antimicrobial effects against the MDR bacteria Staphylococcus spp., Escherichia spp., Pseudomonas spp., Salmonella spp., Klebsiella spp., Enterobacter spp., and E. faecalis BMSE-HMP strains showed antimicrobial effects against both gram-positive and gram-negative strains. Breastfeeding delivers enterococci into the intestinal tract of newborns by lactation, and its usefulness is attracting attention as it has been reported that enterococci have a potential effect on neonatal immune development. In this study, the hemolytic and antimicrobial effects of E. faecalis BMSE-HMP strains on MDR bacteria were investigated, to confirm their potential as useful lactic acid bacteria. Additional studies on the antibiotic resistance and toxicity of the E. faecalis BMSE-HMP strains, isolated in this study, are necessary to prove it safe for use.
Keywords
Human breast milk; anti-hemolytic activity; antimicrobial effect; Enterococcus faecalis;
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