Ozone Disinfection Efficiency for Indicator Microorganisms at Different pH Values and Temperatures

Jamil, Asma; Farooq, Shaukat; Hashmi, Imran

doi:10.1080/01919512.2017.1322489

Cited by 19 publications

(5 citation statements)

References 21 publications

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“…The efficacy of ozone can be enhanced: high relative humidity increases its efficacy through the formation of aggressive chemicals 27 , 32 , 37 , 39 , 48 , and so does high temperature 36 , 49 – 51 . However, both also accelerate the decay of ozone.…”

Section: Resultsmentioning

confidence: 99%

“…However, both also accelerate the decay of ozone. The net effect remains positive, i.e., higher temperatures and humidity may lead to a lower concentration of ozone but still cause a faster inactivation of microorganisms 49 , 51 .…”

Section: Resultsmentioning

confidence: 99%

“…High efficacy; could be produced from in situ resources Scalability unclear; does not reach into crevices; limited material compatibility which could be developed specifically. The efficacy of ozone can be enhanced: high relative humidity increases its efficacy through the formation of aggressive chemicals 27,32,37,39,48 , and so does high temperature 36,[49][50][51] . However, both also accelerate the decay of ozone.…”

Section: 84mentioning

confidence: 99%

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An airlock concept to reduce contamination risks during the human exploration of Mars

Vrankar,

Verseux,

Heinicke

2023

npj Microgravity

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Protecting the Martian environment from contamination with terrestrial microbes is generally seen as essential to the scientific exploration of Mars, especially when it comes to the search for indigenous life. However, while companies and space agencies aim at getting to Mars within ambitious timelines, the state-of-the-art planetary protection measures are only applicable to uncrewed spacecraft. With this paper, we attempt to reconcile these two conflicting goals: the human exploration of Mars and its protection from biological contamination. In our view, the one nominal mission activity that is most prone to introducing terrestrial microbes into the Martian environment is when humans leave their habitat to explore the Martian surface, if one were to use state-of-the-art airlocks. We therefore propose to adapt airlocks specifically to the goals of planetary protection. We suggest a concrete concept for such an adapted airlock, believing that only practical and implementable solutions will be followed by human explorers in the long run.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: 84mentioning

confidence: 99%

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An airlock concept to reduce contamination risks during the human exploration of Mars

Vrankar,

Verseux,

Heinicke

2023

npj Microgravity

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“…The ozone treatment duration required for achieving a 5 log CFU (Colony-Forming Unit) mL −1 reduction of two Escherichia coli strains in apple juice was faster (4 min) at pH 3.0 than at pH 5.0 (18 min) [ 36 ]. Moreover, the survival of E. coli was higher at pH 8.0 as compared to lower pH values in various types of water [ 37 ]. The optimum buffer pH for Staphylococcus aureus survival is 5.5 to 6.0, in comparison with lower pH [ 38 ].…”

Section: Use Of Ozone In Vegetables Industrymentioning

confidence: 99%

Ozone Treatments for Preserving Fresh Vegetables Quality: A Critical Review

Sarron

Gadonna‐Widehem

Aussenac

2021

Foods

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Ozone is recognized as an antimicrobial agent for vegetables storage, washing, and processing. This strong disinfectant is now being used in the food industry. In this review, the chemical and physical properties of ozone, its generation, and factors affecting ozone processing efficiency were explained as well as recent regulatory developments in the food industry. By then selecting three vegetables, we show that ozone avoids and controls biological growth on vegetables, keeping their attractive appearance and sensorial qualities, assuring nutritional characteristics’ retention and maintaining and increasing the shelf-life. In liquid solution, ozone can be used to disinfect processing water and vegetables, and in gaseous form, ozone helps to sanitize and preserve vegetables during storage. The multifunctionality of ozone makes it a promising food processing agent. However, if ozone is improperly used, it causes some deleterious effects on products, such as losses in their sensory quality. For an effective and a safe use of ozone, specific treatment conditions should be determined for all kinds of vegetables. In a last step, we propose highlighting the different essential characteristics of ozone treatment in order to internationally harmonize the data relating to the treatments carried-out.

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“…Although it is mainly used for water treatment, it has also been proven to be highly effective at eliminating bacteria, fungi, and molds, and inactivating viruses, including the SARS virus, on surfaces and in aerosols suspended in the air [ 11 , 12 , 13 , 14 , 15 ]. Its efficiency depends on the treatment conditions (e.g., concentration, exposure time, temperature, and humidity) and material properties (e.g., surface reactivity and porosity) [ 7 , 10 , 11 , 16 , 17 , 18 ]. Its high oxidant activity affects polyunsaturated acids in the biological membranes of bacteria, molds, fungi, and viruses, while also oxidizing nucleic acids (DNA and RNA) [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Ozone Eliminates SARS-CoV-2 from Difficult-to-Clean Office Supplies and Clinical Equipment

Torres-Mata

García-Pérez

Rodrı́guez-Esparragón

et al. 2022

IJERPH

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(1) Background: Severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2) continues to cause profound health, economic, and social problems worldwide. The management and disinfection of materials used daily in health centers and common working environments have prompted concerns about the control of coronavirus disease 2019 (COVID-19) infection risk. Ozone is a powerful oxidizing agent that has been widely used in disinfection processes for decades. The aim of this study was to assess the optimal conditions of ozone treatment for the elimination of heat-inactivated SARS-CoV-2 from office supplies (personal computer monitors, keyboards, and computer mice) and clinical equipment (continuous positive airway pressure tubes and personal protective equipment) that are difficult to clean. (2) Methods: The office supplies and clinical equipment were contaminated in an area of 1 cm2 with 1 × 104 viral units of a heat-inactivated SARS-CoV-2 strain, then treated with ozone using two different ozone devices: a specifically designed ozonation chamber (for low–medium ozone concentrations over large volumes) and a clinical ozone generator (for high ozone concentrations over small volumes). SARS-CoV-2 gene detection was carried out using quantitative real-time polymerase chain reaction (RT-qPCR). (3) Results: At high ozone concentrations over small surfaces, the ozone eliminated SARS-CoV-2 RNA in short time periods—i.e., 10 min (at 4000 ppm) or less. The optimum ozone concentration over large volumes was 90 ppm for 120 min in ambient conditions (24 °C and 60–75% relative humidity). (4) Conclusions: This study showed that the appropriate ozone concentration and exposure time eliminated heat-inactivated SARS-CoV-2 RNA from the surfaces of different widely used clinical and office supplies, decreasing their risk of transmission, and improving their reutilization. Ozone may provide an additional tool to control the spread of the COVID-19 pandemic.

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Ozone Disinfection Efficiency for Indicator Microorganisms at Different pH Values and Temperatures

Cited by 19 publications

References 21 publications

An airlock concept to reduce contamination risks during the human exploration of Mars

An airlock concept to reduce contamination risks during the human exploration of Mars

Ozone Treatments for Preserving Fresh Vegetables Quality: A Critical Review

Ozone Eliminates SARS-CoV-2 from Difficult-to-Clean Office Supplies and Clinical Equipment

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