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| Effects of antibacterial compounds produced by Saccharomyces cerevisiae in Koumiss on pathogenic Escherichia coli O8 and its cell surface characteristics |
| CHEN Yu-jie1, 2, WANG Chun-jie3, HOU Wen-qian2, WANG Xiao-shuo1, GALI Bing-ga1, HUASAI Si-mu-ji-de2, YANG Si-qin2, WU A-qi-ma2, ZHAO Yu-fei1, WU Ying-ga1, CHEN Ao-ri-ge-le2 |
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1 Vocational and Technical College, Inner Mongolia Agricultural University, Baotou 014109, P.R.China
2 College of Animal Science, Inner Mongolia Agricultural University, Hohhot 010018, P.R.China
3 College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot 010018, P.R.China
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Abstract The effects of antibacterial compounds produced by Saccharomyces cerevisiae in Koumiss on pathogenic Escherichia coli O8 and its cell surface characteristics were investigated. S. cerevisiae isolated from Koumiss produced antibacterial compounds which were active against pathogenic E. coli O8 as determined by the Oxford cup method. The aqueous phases from S. cerevisiae at pH=2.0 (S2) and pH=8.0 (S8) were extracted and tested, respectively. The organic acids of S2 and S8 were determined by high performance liquid chromatography (HPLC), and the concentrations of killer toxins were determined by enhanced bicinchoninic acid (BCA) Protein Assay Kit. The minimum inhibition concentration (MIC) and the minimum bactericidal concentration (MBC) of S2 and S8 on E. coli O8 were determined by the broth microdilution method. The effects of S2 and S8 on the growth curve of E. coli O8 were determined by turbidimetry, and the hydrophobicities of E. coli O8 cell surface were determined using the microbial adhesion to solvents method, the permeation of E. coli O8 cell membrane were determined by the o-nitrophenyl-β-D-galactoside (ONPG) method. Aqueous phases at pH 2.0 and 8.0 had larger inhibition zones and then S2 and S8 were obtained by freeze-drying. The main component in S2 was citric acid and it was propanoic acid in S8. Other organic acids and killer toxins were also present. Both the MICs of S2 and S8 on E. coli O8 were 0.025 g mL–1, the MBCs were 0.100 and 0.200 g mL–1, respectively. The normal growth curve of E. coli O8 was S-shaped, however, it changed after addition of S2 and S8. E. coli O8 was the basic character, and had a relatively hydrophilic surface. The hydrophobicity of E. coli O8 cell surface and the permeation of E. coli O8 cell membrane were increased after adding S2 and S8. The present study showed that S2 and S8 inhibit the growth of pathogenic E. coli O8 and influence its cell surface characteristics.
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Received: 14 July 2016
Accepted:
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| Fund: This work was supported by the National Natural Science Funds, China (31260570, 31260590, 31060318), the National Key Technologies R&D Program (2012BAD12B09-3), the Innovation Projects of Inner Mongolia Graduate Education, China (B20141012911). |
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Corresponding Authors:
CHEN Ao-ri-ge-le, Mobile: +86-13848138961, E-mail: aori6009@163.com
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| About author: CHEN Yu-jie, Mobile: +86-18548180220, E-mail: chenyujie 434479069@163.com |
Cite this article:
CHEN Yu-jie, WANG Chun-jie, HOU Wen-qian, WANG Xiao-shuo, GALI Bing-ga, HUASAI Si-mu-ji-de, YANG Si-qin, WU A-qi-ma, ZHAO Yu-fei, WU Ying-ga, CHEN Ao-ri-ge-le .
2017.
Effects of antibacterial compounds produced by Saccharomyces cerevisiae in Koumiss on pathogenic Escherichia coli O8 and its cell surface characteristics. Journal of Integrative Agriculture, 16(03): 742-748.
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