SENSITIZATION OF ESCHERICHIA COLI O157:H7 TO ACIDIC CONDITIONS BY CHITOSAN AND NANOCHITOSAN

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ZAREI M.; POURMAHDI BORUJENI M.; KESHAVARZ Z.

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Journal: JOURNAL OF VETERINARY MICROBIOLOGY Year:2016 | Volume:12 | Issue:1 (32) Page(s): 47-59

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Title

SENSITIZATION OF ESCHERICHIA COLI O157:H7 TO ACIDIC CONDITIONS BY CHITOSAN AND NANOCHITOSAN

Author(s)

ZAREI M. | POURMAHDI BORUJENI M. | KESHAVARZ Z. | Issue Writer Certificate

Keywords

ESCHERICHIA COLI O157:H7Q2

CHITOSANQ1

NANOCHITOSANQ1

ACID TOLERANCEQ1

Abstract

Chitosan, a natural nontoxic biopolymer derived by de acetylation of chitin, has received considerable attention for its commercial applications in the food industry. In the present study, the ability of CHITOSAN and CHITOSAN nanoparticles to sensitize Escherichia coli O157: H7 to low pH was assessed. To achieve this purpose, cells of E. coli O157: H7 were exposed to pH 4 and 5 adjusted by adding hydrochloric and acetic, acids into TSB, in the presence of 0.0, 0.05, 0.1 and 0.2 % CHITOSAN, for one hour. CHITOSAN did not show antibacterial activity at pH 5, while 0.2 % nano CHITOSAN made E. coli O157: H7 cells more sensitive to this pH. However, antibacterial activity of both CHITOSAN and nano CHITOSAN were higher at pH 4, where 0.2 % CHITOSAN and 0.1 and 0.2 % nano CHITOSAN showed significant antibacterial effects on E. coli O157: H7 at this pH. In general, the higher antibacterial activity of nano CHITOSAN than CHITOSAN may be due to the nanoparticle's larger surface area and higher affinity with bacterial cells. Results of the fluorescent staining demonstrated that CHITOSAN and nano CHITOSAN exerted their effect by disrupting the cellular membrane of the cells.

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APA: Copy

ZAREI, M., POURMAHDI BORUJENI, M., & KESHAVARZ, Z.. (2016). SENSITIZATION OF ESCHERICHIA COLI O157:H7 TO ACIDIC CONDITIONS BY CHITOSAN AND NANOCHITOSAN. JOURNAL OF VETERINARY MICROBIOLOGY, 12(1 (32) ), 47-59. SID. https://sid.ir/paper/152090/en

Vancouver: Copy

ZAREI M., POURMAHDI BORUJENI M., KESHAVARZ Z.. SENSITIZATION OF ESCHERICHIA COLI O157:H7 TO ACIDIC CONDITIONS BY CHITOSAN AND NANOCHITOSAN. JOURNAL OF VETERINARY MICROBIOLOGY[Internet]. 2016;12(1 (32) ):47-59. Available from: https://sid.ir/paper/152090/en

IEEE: Copy

M. ZAREI, M. POURMAHDI BORUJENI, and Z. KESHAVARZ, “SENSITIZATION OF ESCHERICHIA COLI O157:H7 TO ACIDIC CONDITIONS BY CHITOSAN AND NANOCHITOSAN,” JOURNAL OF VETERINARY MICROBIOLOGY, vol. 12, no. 1 (32) , pp. 47–59, 2016, [Online]. Available: https://sid.ir/paper/152090/en

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