Vapour phase: a potential future use for essential oils as antimicrobials?

Laird, Katie; Phillips, Carol A

doi:10.1111/j.1472-765x.2011.03190.x

Cited by 129 publications

(82 citation statements)

References 43 publications

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“…Our findings confirm those of fellow researchers who stated that application in the vapour phase is preferred because of increased volatile activity and the ability to use lower concentrations. 40 In the present study, concentrations used in the volatile experiment were at a lower garlic concentration than the amended media experiments. Furthermore, increased antifungal activity was noted.…”

Section: 27mentioning

confidence: 91%

In-vitro effects of garlic extracts on pathogenic fungi Botrytis cinerea, Penicillium expansum and Neofabraea alba

2015

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HOW TO CITE:Daniel CK, Lennox CL, Vries FA. In-vitro effects of garlic extracts on pathogenic fungi Botrytis cinerea, Penicillium expansum and Neofabraea alba. In-vitro effects of garlic extracts on pathogenic fungi Botrytis cinerea, Penicillium expansum and Neofabraea albaThe antifungal activity of garlic extracts applied directly and through volatile release was tested against the growth of postharvest pathogens Botrytis cinerea, Penicillium expansum and Neofabraea alba. Mycelial growth of B. cinerea and P. expansum was inhibited by aqueous and ethanol dilutions on garlic extract amended media (direct method) in a dose-response manner. The aqueous dilution was more effective than the ethanol dilution. Both dilutions inhibited mycelial growth of N. alba to a similar extent but no trend in data was noted across the concentration range. Calculated EC 50 values indicated that 13.36% and 8.09% aqueous dilutions could be used to inhibit growth of B. cinerea and P. expansum, respectively; however, values generated for N. alba either bordered on or exceeded the concentration range. The volatile vapour application of garlic was able to inhibit mycelial growth and spore germination of all pathogens at concentrations as low as 20%. Gas chromatography-mass spectrometry analysis showed that 85.95% of compounds present in the garlic sample belonged to a sulphur or sulphur-derived group. Allicin, the active component of garlic, was not found; however, breakdown products of allicin were present in high amounts. Overall, the antifungal activity of garlic extracts for the control of B. cinerea and P. expansum was confirmed. Further investigations into the antifungal effect of garlic extracts on N. alba is required, although garlic volatiles seem to be effective. This report is the first of antifungal activity of garlic extracts against N. alba -the causal agent of bull's eye rot, one of the major diseases of apples.

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Section: 27mentioning

confidence: 91%

In-vitro effects of garlic extracts on pathogenic fungi Botrytis cinerea, Penicillium expansum and Neofabraea alba

2015

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“…Moreover, application of essential oils in the vapour phase has been shown to be effective at low concentrations due to the volatility and therefore is a more attractive fumigant for postharvest disease (Lopez-Reyes et al, 2010;Laird and Phillips, 2011). One essential oil that has these properties is thyme oil (TO) whose active ingredient is thymol, which is a natural monoterpene phenol derivative.…”

Section: Introductionmentioning

confidence: 99%

Expression of pathogenesis-related (PR) genes in avocados fumigated with thyme oil vapours and control of anthracnose

et al. 2016

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Highlights• Thyme oil fumigation effectively controlled the anthracnose in avocados.• Defence enzymes (chitinase and β-1,3-glucanase) were induced by thyme oil fumigation.• Thyme oil fumigation initiated the expression and activities of defense enzymes. AbstractThyme oil (TO) fumigation (96 μL L -1 ) to cv. Hass and Ryan avocados significantly reduced anthracnose incidence compared to prochloraz and to untreated control. Also enhanced activities of β-1,3-glucanase, chitinase were noted in both cultivars. TO fumigation induced the expression of both β-1,3-glucanase and chitinase genes in naturally infected fruit of both cultivars, during storage at 7 or 7.5 °C for up to 21 d and during subsequent simulated market shelf conditions at 20 °C for 5 d. However, the impact of TO fumigation on the β-1,3-glucanase gene expression was higher in both cultivars. Higher gene regulation and β-1,3-glucanase, chitinase activities were observed in cv. Ryan compared to Hass. Although TO 2 fumigation significantly reduced anthracnose incidence in both naturally infected cultivars, the inhibitory effect was slightly higher in cv. Ryan than Hass. Thus postharvest TO fumigation had positive effects on enhancing anthracnose disease resistance during storage and also gave a residual effect during the simulated shelf life.

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“…The hydrophilic components of EOs are more critical in direct contact than volatile substances, whereas in vapor phase the volatile components could be both hydrophilic and hydrophobic [51]. This may occur due to high number of monoterpenes in vapor of EOs, they can attack the bacteria easily compare to liquid phase [52]. Thus, citrus as well as menthe and eucalyptus oils can be used as air decontaminants in fields and they can be good candidates to be used in agriculture as bio bactericide.…”

Section: Chemical Composition Of Essential Oilsmentioning

confidence: 99%

Evaluation of the Potential of Some Essential Oils in Biological Control against Phytopathogenic Agent Pseudomonas syringae pv. Tomato DC3000 Responsible for the Tomatoes Speck

Sabir¹,

Elkhalfi²,

Errachidi³

et al. 2017

J Plant Pathol Microbiol

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To investigate biological control mains against phytopathogenic agent Pseudomonas syringae pv. tomato DC3000, responsible for bacterial speck, tests on the antibacterial activity of six essential oils were carried out. The essential oils, obtained by hydro distillation, was analyzed by gas chromatography (GC). The determination of the antibacterial activity of the essential oils carried out in-vitro using the well diffusion, micro atmosphere methods and the determination of MIC and CMB. Only essential oils of Cedrus atlantica had a negative activity against the bacterial strain. However, the overall results of this study suggested that Mintha pulegium, Thym vulgaris, Eucalyptus globulus essential oils had potential as a bio-pesticide for the control of bacterial speck disease of tomato. genetics and biotechnology (PGMB) [5]. This strain is characterized by the production of an endotoxin (pyoverdine) [10] and by its multiple resistance to antibiotics (rifampicin) [4]. The P. syringae pv. tomato cultures were grown on King's B and LB with rifampicin (50 g/ml) agar plates for strain verification.

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Vapour phase: a potential future use for essential oils as antimicrobials?

Cited by 129 publications

References 43 publications

In-vitro effects of garlic extracts on pathogenic fungi Botrytis cinerea, Penicillium expansum and Neofabraea alba

In-vitro effects of garlic extracts on pathogenic fungi Botrytis cinerea, Penicillium expansum and Neofabraea alba

Expression of pathogenesis-related (PR) genes in avocados fumigated with thyme oil vapours and control of anthracnose

Evaluation of the Potential of Some Essential Oils in Biological Control against Phytopathogenic Agent Pseudomonas syringae pv. Tomato DC3000 Responsible for the Tomatoes Speck

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