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Abstract Title:

Identification of Essential Oils with Strong Activity against Stationary Phase.

Abstract Source:

Antibiotics (Basel). 2018 Oct 16 ;7(4). Epub 2018 Oct 16. PMID: 30332754

Abstract Author(s):

Jie Feng, Wanliang Shi, Judith Miklossy, Genevieve M Tauxe, Conor J McMeniman, Ying Zhang

Article Affiliation:

Jie Feng


Lyme disease is the most common vector borne-disease in the United States (US). While the majority of the Lyme disease patients can be cured with 2⁻4 weeks antibiotic treatment, about 10⁻20% of patients continue to suffer from persisting symptoms. While the cause of this condition is unclear, persistent infection was proposed as one possibility. It has recently been shown thatdevelops dormant persisters in stationary phase cultures that are not killed by the current Lyme antibiotics, and there is interest in identifying novel drug candidates that more effectively kill such forms. We previously identified some highly active essential oils with excellent activity against biofilm and stationary phaseHere, we screened another 35 essential oils and found 10 essential oils (L. bulbs,Lindl. berries,L. seeds,var.Bruno grass,(T. Nees) Engl. resin,Buch.-Ham. ex Sm. flowers,L. wood,L. leaves,(Lour.) Pers. fruits,Hook. leaves) and the active component of cinnamon bark cinnamaldehyde (CA) at a low concentration of 0.1% have strong activity against stationary phase. At a lower concentration of 0.05%, essential oils ofL. bulbs,Lindl. berries,var.Bruno grass and CA still exhibited strong activity against the stationary phase. CA also showed strong activity against replicating, with a MIC of 0.02% (or 0.2μg/mL). In subculture studies, the top five essential oil hitsL. bulbs,Lindl. berries,(T. Nees) Engl. resin,Buch.-Ham. ex Sm. flowers, and(Lour.) Pers. fruits completely eradicated allstationary phase cells at 0.1%, whilevar.Bruno grass,Hook. leaves,L. wood,L. seeds, andL. leaves failed to do so as shown by visible spirochetal growth after 21-day subculture. At concentration of 0.05%, onlyL. bulbs essential oil and CA sterilized thestationary phase culture, as shown by no regrowth during subculture, whileLindl. berries,(T. Nees) Engl. resin,Buch.-Ham. ex Sm. flowers and(Lour.) Pers. fruits essential oils all had visible growth during subculture. Future studies are needed to determine if these highly active essential oils could eradicate persistentinfection in vivo.

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