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Reduction of Legionella spp. in Water and in Soil by a Citrus Plant Extract Vapor

Identifieur interne : 000939 ( Main/Exploration ); précédent : 000938; suivant : 000940

Reduction of Legionella spp. in Water and in Soil by a Citrus Plant Extract Vapor

Auteurs : Katie Laird [Royaume-Uni] ; Elena Kurzbach [Royaume-Uni] ; Jodie Score [Royaume-Uni] ; Jyoti Tejpal [Royaume-Uni] ; George Chi Tangyie [Royaume-Uni] ; Carol Phillips [Royaume-Uni]

Source :

Applied and Environmental Microbiology [ 0099-2240 ] ; 2014.

RBID : PMC:4178682

Abstract

Legionnaires' disease is a severe form of pneumonia caused by Legionella spp., organisms often isolated from environmental sources, including soil and water. Legionella spp. are capable of replicating intracellularly within free-living protozoa, and once this has occurred, Legionella is particularly resistant to disinfectants. Citrus essential oil (EO) vapors are effective antimicrobials against a range of microorganisms, with reductions of 5 log cells ml⁻¹ on a variety of surfaces. The aim of this investigation was to assess the efficacy of a citrus EO vapor against Legionella spp. in water and in soil systems. Reductions of viable cells of Legionella pneumophila, Legionella longbeachae, Legionella bozemanii, and an intra-amoebal culture of Legionella pneumophila (water system only) were assessed in soil and in water after exposure to a citrus EO vapor at concentrations ranging from 3.75 mg/liter air to 15g/liter air. Antimicrobial efficacy via different delivery systems (passive and active sintering of the vapor) was determined in water, and gas chromatography-mass spectrometry (GC-MS) analysis of the antimicrobial components (linalool, citral, and β-pinene) was conducted. There was up to a 5-log cells ml⁻¹ reduction in Legionella spp. in soil after exposure to the citrus EO vapors (15 mg/liter air). The most susceptible strain in water was L. pneumophila, with a 4-log cells ml⁻¹ reduction after 24 h via sintering (15 g/liter air). Sintering the vapor through water increased the presence of the antimicrobial components, with a 61% increase of linalool. Therefore, the appropriate method of delivery of an antimicrobial citrus EO vapor may go some way in controlling Legionella spp. from environmental sources.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4178682

DOI: 10.1128/AEM.01275-14
PubMed: 25063652
PubMed Central: 4178682

Affiliations:

Royaume-Uni

Le document en format XML

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<front><div type="abstract" xml:lang="en"><p>Legionnaires' disease is a severe form of pneumonia caused by <named-content content-type="genus-species">Legionella</named-content>
 spp., organisms often isolated from environmental sources, including soil and water. <named-content content-type="genus-species">Legionella</named-content>
 spp. are capable of replicating intracellularly within free-living protozoa, and once this has occurred, <named-content content-type="genus-species">Legionella</named-content>
 is particularly resistant to disinfectants. Citrus essential oil (EO) vapors are effective antimicrobials against a range of microorganisms, with reductions of 5 log cells ml<sup>−1</sup>
 on a variety of surfaces. The aim of this investigation was to assess the efficacy of a citrus EO vapor against <named-content content-type="genus-species">Legionella</named-content>
 spp. in water and in soil systems. Reductions of viable cells of <named-content content-type="genus-species">Legionella pneumophila</named-content>
, <named-content content-type="genus-species">Legionella longbeachae</named-content>
, <named-content content-type="genus-species">Legionella bozemanii</named-content>
, and an intra-amoebal culture of <named-content content-type="genus-species">Legionella pneumophila</named-content>
 (water system only) were assessed in soil and in water after exposure to a citrus EO vapor at concentrations ranging from 3.75 mg/liter air to 15g/liter air. Antimicrobial efficacy via different delivery systems (passive and active sintering of the vapor) was determined in water, and gas chromatography-mass spectrometry (GC-MS) analysis of the antimicrobial components (linalool, citral, and β-pinene) was conducted. There was up to a 5-log cells ml<sup>−1</sup>
 reduction in <named-content content-type="genus-species">Legionella</named-content>
 spp. in soil after exposure to the citrus EO vapors (15 mg/liter air). The most susceptible strain in water was <named-content content-type="genus-species">L. pneumophila</named-content>
, with a 4-log cells ml<sup>−1</sup>
 reduction after 24 h via sintering (15 g/liter air). Sintering the vapor through water increased the presence of the antimicrobial components, with a 61% increase of linalool. Therefore, the appropriate method of delivery of an antimicrobial citrus EO vapor may go some way in controlling <named-content content-type="genus-species">Legionella</named-content>
 spp. from environmental sources.</p>
</div>
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Reduction of Legionella spp. in Water and in Soil by a Citrus Plant Extract Vapor

Reduction of Legionella spp. in Water and in Soil by a Citrus Plant Extract Vapor

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