Antimicrobial Interaction between Endophytic Actinobacteria Associated with Listea Cubeba and Listea Cubeba Essential Oils Against Food Borne Bacteria

Thu Trang Vu1, , Hai Van Nguyen1, Thi Hanhuyen Vu2, Quyet Tien Phi2, Thi Yen Do1, Ky Son Chu1
1 Hanoi University of Science and Technology - No. 1, Dai Co Viet, Hai Ba Trung, Ha Noi, Viet Nam
2 Vietnam Academy of Science and Technology - No. 18, Hoang Quoc Viet, Ha Noi, Viet Nam

Main Article Content

Abstract

The purpose of the study was to investigate the antimicrobial activity of endophytic actinomycetes isolated from Listea cubeba (L. cubeba) and its essential oil on two food-borne pathogenic bacteria Gram-positive Escherichia coli ATCC 25922 (E. coli) and Gram-positive Staphylococcus aureus ATCC 25923 (S. aureus) individual and in combination. The results indicated that 3 among 7 endophytic actinomycetes (MPT44, MPT42, MPT 62) showed antibacterial activity against tested strains with the antibacterial diameter ranging from 17 – 44 mm. Using the broth micro-dilution assay, minimum inhibitory concentration (MIC) of endophytic actinomycetes bacteria were from 6.25 to 25 µl/ml. From the indices of fractional inhibitory concentration (FIC) of the combination of L. cubeba essential oil and its endophytic actinomycetes, the synergistic effects were found against E. coli, S. aureus. The combination of L. cubeba essential oil and its endophytic actinomycetes broth culture enhances the antimicrobial efficacy gainst foodborne pathogens 3 to 8 times comparing with individual treatment. In addition, the combination use of essential oils and secondary metabolites from endophytic bacteria should be useful way to enhance food security.

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References

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