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Walter de Gruyter GmbH Biomolecular Concepts 15(1)
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    초록·키워드

    This study explores the synergistic antibacterial effects of essential oils (EOs) and phenolic extracts from three plants against foodborne pathogenic bacteria. The present work aimed to investigate the synergistic effects of the binary and the ternary combinations of extracts using different blend proportions of the following plant extracts: <i>Artemisia campestris</i> (AC), <i>Artemisia herba alba</i> (AHA), and <i>Citrus aurantium</i> (CA). The antimicrobial activities of EOs and phenolic extracts were determined and evaluated against five strains. For the EOs, the results of the DIZ showed the existence of synergism for different combinations of binary blends, such as AC/AHA or AHA/CA against <i>Escherichia coli</i>, and AC/CA against <i>Enterobacter faecalis</i>. In addition, ternary blends of AC:AHA:CA at a ratio of 1/6:2/3:1/6 exhibited a synergy effect, as measured by the CI, against <i>E. coli</i>. On the other hand, for the phenolic extracts, synergistic effects were noticed for binary blends of AC/CA at different ratios against <i>E. coli</i>, <i>E. faecalis,</i> and <i>Pseudomonas aeruginosa</i> strains. Similarly, ternary blends of phenolic extracts presented synergy against <i>E. coli</i>, <i>E. faecalis</i>, <i>P. aeruginosa</i> strains, and even <i>C. albicans</i>. In this case, the blending ratios were crucial determining factors for maximizing the synergy effect. The study established that the proportion of a single drug could play an essential role in determining the bioefficacy of a drug combination treatment. Therefore, the results showed the importance of studying the modulation of antibacterial activities based on the proportions of extracts in the mixture and finding the range of proportions (as determined by SLMD) that have a synergistic/additive/antagonistic effect with no or low side effects, which can be used in a food preservation system.

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