Safety Assessment of Lactic Acid Bacteria Isolated from Foods and Drugs

doi:10.7506/spkx1002-6630-201419035

Abstract

Abstract:

Totally 36 lactic acid bacteria (LAB) strains were isolated from different samples. The analysis of antibiotic
susceptibility showed that 26 strains of them were resistant to one or more antibiotic agents, and 4 of the 26 strains carried
antibiotic resistant genes. The tetracycline resistant genes tet (M) and tet (L), carried by Enterococcus faecium KN9 could
be transferred to the recipient Lactococcus lactis MG1614 by conjugation. We also assessed the ability of production of
undesirable metabolites, and the results showed that some of 36 isolates could produce tyramine or/and histamine, but none
of them could produce nitroreductase or azoreductase. Therefore, we could conclude that most of the isolates are safe, and
E. faecium KN9 carrying tetracycline resistance genes may be detrimental to human beings so that it is necessary to perform
safety assessment of lactic acid bacteria before they are applied.

Key words: lactic acid bacteria, safety assessment, antibiotic resistance, conjugation, biogenic amine

CLC Number:

YANG Pu, KONG Wen-tao, SUN Zhi-lan, XU Yi, KONG Jian. Safety Assessment of Lactic Acid Bacteria Isolated from Foods and Drugs[J]. FOOD SCIENCE, doi: 10.7506/spkx1002-6630-201419035.

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Safety Assessment of Lactic Acid Bacteria Isolated from Foods and Drugs

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