A study of the minimum inhibitory concentration and mode of action of oregano essential oil, thymol and carvacrol.

Abstract:

AIMS:The minimum inhibitory concentration (MIC) of oregano essential oil (OEO) and two of its principle components, i.e. thymol and carvacrol, against Pseudomonas aeruginosa and Staphylococcus aureus was assessed by using an innovative technique. The mechanism of action of the above substances was also investigated. METHODS AND RESULTS:The applied technique uses 100-well microtitre plate and collects turbidimetric growth data. To produce the inhibition profiles, a wide range of concentrations were tested for each of the three compounds, as well as for carvacrol-thymol mixtures. Following a specific mathematical analysis of the observed inhibition profiles from all compounds, it was suggested that mixtures of carvacrol and thymol gave an additive effect and that the overall inhibition by OEO can be attributed mainly to the additive antimicrobial action of these two compounds. Addition of low amounts of each additive: (a) increased permeability of cells to the nuclear stain EB, (b) dissipated pH gradients as indicated by the CFDA-SE fluorescent probe irrespective of glucose availability and (c) caused leakage of inorganic ions. CONCLUSION:Mixing carvacrol and thymol at proper amounts may exert the total inhibition that is evident by oregano essential oil. Such inhibition is due to damage in membrane integrity, which further affects pH homeostasis and equilibrium of inorganic ions. SIGNIFICANCE AND IMPACT OF THE STUDY:The knowledge of extent and mode of inhibition of specific compounds, which are present in plant extracts, may contribute to the successful application of such natural preservatives in foods, since certain combinations of carvacrol-thymol provide as high inhibition as oregano essential oil with a smaller flavour impact.

journal_name

J Appl Microbiol

authors

Lambert RJ,Skandamis PN,Coote PJ,Nychas GJ

doi

10.1046/j.1365-2672.2001.01428.x

subject

Has Abstract

pub_date

2001-09-01 00:00:00

pages

453-62

issue

3

eissn

1364-5072

issn

1365-2672

pii

jam1428

journal_volume

91

pub_type

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