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KMID : 1007520170260020447
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Food Science and Biotechnology
2017 Volume.26 No. 2 p.447 ~ p.452
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Antibiotic resistance and tolerance to simulated gastrointestinal conditions of eight hemolytic Bacillus pumilus isolated from pulque, a traditional Mexican beverage
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Gonzalez Vazquez Raquel
Mayorga Reyes Lino
Monroy Lopez Armando
Reyes Nava Luis A.
Rivera Espinoza Yadira
Azaola Espinosa Alejandro
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Abstract
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Traditional fermented sap beverages from two provinces of Mexico were studied for the isolation of pathogenic bacteria from these beverages. Eight strains of hemolytic Gram positive bacteria, identified as Bacillus pumilus (B. pumilus), were isolated. They showed different antibiotic resistance profiles and tolerances to the simulated gastrointestinal conditions. All the B. pumilus isolated were resistant to at least one antibiotic tested. Regarding the simulated gastrointestinal conditions, strains S1 and S3 were able to tolerate all the conditions. Hemolytic activity has been associated with a health risk and is often considered as a virulence determinant associated with pathogenicity. Therefore, the hemolytic activity along with the ability to tolerate gastrointestinal conditions and the resistance to antibiotics exhibited by B. pumilus strains S1 and S3 could be associated with a health risk for pulque consumers.
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KEYWORD
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pulque, Bacillus pumilus, hemolytic activity, antibiotic resistance, simulated gastrointestinal stress
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