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Isolation, Purification and Characterization of Antimicrobial Peptides Produced from Saccharomyces boulardii

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Saccharomyces boulardii was used for antimicrobial peptides production. Separation process of produced antimicrobial peptides was conducted using ultrafiltration technique through dialysis membranes with porous 10 (MWCO) kDa. The inhibition activity was determined against four bacterial isolates. As a result, higher inhibition zone against Bacillus cereus were 26, 29 and 33 mm after adding 50, 75 and 100 µL of concentrated peptide, respectively. After that, peptide passed through the Sephadex G-50 column to achieve purified peptide using gel filtration. The high activity of purified peptide was confirmed based on the second peak reaching to 37 mm of bacterial inhibition zone while other peaks did not show any inhibition against tested bacteria. Some of the important characteristics of purified bioactive peptide were applied. Antimicrobial peptides stability was studied and found to be stable at pH range from 5 to 7 values studied in addition to its inhibition activity reached to 100%. Regarding thermal stability, it was observed that the peptide was fully activity at a both 60–80 °C for 30 min. Moreover, molecular weight of a peptide was identified using electrophoresis technique with SDS measured at 5792 Dalton.

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Correspondence to Alaa Kareem Naimah.

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Naimah, A.K., Al-Manhel, A.J.A. & Al-Shawi, M.J. Isolation, Purification and Characterization of Antimicrobial Peptides Produced from Saccharomyces boulardii . Int J Pept Res Ther 24, 455–461 (2018).

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