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- W2993665171 abstract "Background and Objectives: Antimicrobial peptides produced by lactic acid bacteria have gained enormous attention owing to their health benefits. This study aimed to isolate, purify and characterize the antibacterial protein produced by au- tochthonous Lactobacillus casei TA0021 strain. Materials and Methods: The antagonistic activity of L. casei TA0021 against a number of pathogenic bacteria was tested by agar well diffusion assay. The antimicrobial agent in the neutralized supernatant fluids was subjected to the action of proteolytic enzymes, catalase, lipase and lysozyme, and their tolerance to variable pH and temperature was estimated. The proteinaceous antagonistic compound was precipitated by 60% w/v ammonium sulphate, desalted and subjected to cation exchange and gel filtration chromatography. Approximate molecular weight of Lactocin was determined by SDS-PAGE and non-denaturing gel electrophoresis. Hemoglobin release assay and cytotoxicity effect of Lactocin TA0021 was determined. The results were statistically analyzed. Results: The antagonistic agent active against Salmonella Typhimurium and Shigella flexneri appeared resistant to catalase and lipase treatments, while sensitive to the tested proteolytic enzymes. Lactocin TA0021 resisted acidic pH values of 3.0, while alkaline pH values of ˃9 completely destroyed the activity. The antibacterial peptide was approximately 68 KDa and heat labile as lost its activity at 100°C after 5 minutes. The bacteriocin was non-toxic to MRC-5 cell lines and non-hemolytic. Purification method lead to increase in antibacterial activity while, subsequent decrease in recovery and yield was observed with increasing purification fold. Conclusion: The purified antimicrobial protein from L. casei TA0021 might be used for application in medicinal and food products." @default.
- W2993665171 created "2019-12-13" @default.
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- W2993665171 date "2019-12-04" @default.
- W2993665171 modified "2023-09-26" @default.
- W2993665171 title "Physico-chemical and cytotoxic analysis of a novel large molecular weight bacteriocin produced by Lactobacillus casei TA0021" @default.
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- W2993665171 doi "https://doi.org/10.18502/ijm.v11i5.1958" @default.
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