Effects of aqueous ozone on Pseudomonas syringae viability and ice nucleating activity

Sarron, Elodie; Cochet, N.; Gadonna‐Widehem, Pascale

doi:10.1016/j.procbio.2013.05.018

Cited by 8 publications

(8 citation statements)

References 49 publications

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“…All results were reproducible across three experiments for each pollen type. We note that the two prior studies of ozone aging of biological particles have also either shown suppression of IN activity or no effect (Attard et al, 2012;Sarron et al, 2013).…”

Section: Ice Nucleation Activity Of Chemically Oxidized Pollenmentioning

confidence: 61%

“…Another term used for pollen compounds released into the atmosphere are subpollen particles (SPPs) with submicron sizes (Steiner et al, ). A few prior studies of oxidation of biological/organic ice nucleating materials have been conducted, all via ozone oxidation (Attard et al, ; Brooks et al, ; Sarron et al, ; Wang & Knopf, ). However, experiments assessing the effect of the most important oxidant in the atmosphere, the hydroxyl radical (OH), have not been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Another term used for pollen compounds released into the atmosphere are subpollen particles (SPPs) with submicron sizes (Steiner et al, 2015). A few prior studies of oxidation of biological/organic ice nucleating materials have been conducted, all via ozone oxidation (Attard et al, 2012;Brooks et al, 2014;Sarron et al, 2013;Wang & Knopf, 2011 surface oxidation and react in clouds, given that cloud water OH is known to form via a number of sources (Lelieveld & Crutzen, 1991).…”

Section: Introductionmentioning

confidence: 99%

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Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen

Gute

Abbatt

2018

Geophysical Research Letters

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Pollen carry water extractable compounds with ice nucleating (IN) activity. This study investigates whether the hydroxyl radical, as the major atmospheric oxidant, can affect the IN activity of silver birch and grey alder subpollen particles under in‐cloud conditions for deposition freezing mode conditions at 234 K. It is found that oxidation increases the supersaturation ratio with respect to ice necessary for the onset of ice nucleation and decreases the fraction of particles which initiate ice nucleation. This reduction of IN activity under equivalent oxidation conditions does not occur with a mineral dust sample (Arizona Test Dust). Chemical analysis of fresh and oxidized pollen material indicates a change of molecular structure with a loss of conjugation and an increase in oxidized functional groups, such as carbonyls. This is the first demonstration that in‐cloud oxidation may lower the IN abilities of biological particles such as pollen.

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Section: Ice Nucleation Activity Of Chemically Oxidized Pollenmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen

Gute

Abbatt

2018

Geophysical Research Letters

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“…Recently, the effects of the pH of cloud water, UV light, NO 2 and O 3 on the INA of Pseudomonus syringae have been examined (Attard et al, 2012;Sarron et al, 2013). Their results indicated that acidic pH has strong effects on the INA of Pseudomonus syringae, which can be highly reduced at the temperatures above -8°C.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Study of Effects of Atmospheric Pollutants on Ice Nucleation Activity of Bacteria

Wang

Sun

et al. 2015

Aerosol Air Qual. Res.

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Ice nuclei of some bacterial origin as ice catalysts can initiate ice nucleation at temperatures as warm as -2°C in certain laboratory experiments. The ice nucleation activities of airborne bacteria in the real atmosphere may be different from those experiments. To estimate the impact of typical atmospheric pollutants including monocarboxylic acids (MCAs), dicarboxylic acids (DCAs) and ammonia sulfate on ice nucleation activity of P.syringae pv lachrymans and P.syringae pv.panici, we have conducted some experiments by means of the modified Vali's droplet freezing testing method in the immersion freezing mode with the mixture of the pure water and the polluted water. Our results show that the ice nucleation activity of bacterial origins can be regulated by such pollutant compounds even though the onset freezing temperatures of water droplets mainly depend on the concentrations of ice nucleation-active bacteria. Atmospheric acids can decrease ice nucleation activity of P.syringae pv lachrymans and P.syringae pv.panici. However, the onset freezing temperatures of water droplets immersed with ice nucleation-active P.syringae pv lachrymans will be enhanced by the low concentration of such atmospheric pollutants.

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“…As a very reactive oxidizing agent, O 3 has proved effective against a broad spectrum of living organisms and chemicals. It kills bacteria, fungi, yeasts, viruses and protozoa [17,18,[22][23][24][25][26][27][28] storage pests, such as insects & mites. It also has the potential to degrade mycotoxins, pesticides and toxic chemical wastes [2, 7-9, 26, 29-34].…”

Section: Ozone Gasmentioning

confidence: 99%

Effectiveness of Ozone Gas Application Methods against Combined Multi-Contaminants in Food

Christ¹,

Savi²,

Scussel³

2017

fph

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Despite the ozone (known as GRAS -generally recognized as safe) gas treatments published for each food living organism or chemical decontamination, they are not necessarily present or contaminate food individually. Most of the time, they are present all together. Therefore, the most important point, regarding an O 3 application method to be chosen is its effectiveness to all contaminants that may be in the target food. Therefore, ozone gas decontamination methods that gather combined multi-contaminants and their effectiveness in food were surveyed. Both, for inactivation of living organisms (insects, mites, fungi, yeasts and bacteria) and degradation of toxic compounds (pesticides and mycotoxins). They are the main need for an effective and comprehensive commercial decontamination application. This review brings details on O 3 formation energy sources, its application conditions (concentration / time of exposure), container characteristics (volume / material type / sealed or hermetic) and effectiveness for different food (type / contamination level / batch size/moisture content). From the studies and data reported, ozone has shown to be an efficient green agent for combined multi-decontamination, thus prolonging the food storage and shelf life. It does not cause/produce adverse effects on food quality.

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Effects of aqueous ozone on Pseudomonas syringae viability and ice nucleating activity

Cited by 8 publications

References 49 publications

Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen

Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen

Laboratory Study of Effects of Atmospheric Pollutants on Ice Nucleation Activity of Bacteria

Effectiveness of Ozone Gas Application Methods against Combined Multi-Contaminants in Food

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