Effect of different process conditions on the physicochemical and antimicrobial properties of plasma-activated water

Cai, Zhicheng; Wang, Jiamei; Wang, Y. Y.; Sang, Xiaohan; Zeng, Lizhi; Deng, Wentao; Zhang, Jianhao

doi:10.1088/2058-6272/acde34

Cited by 8 publications

(3 citation statements)

References 42 publications

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“…Chemical inactivation includes chlorine bactericides, electrolyzed water, plasma-activated water (PAW), and organic acids. PAW is an innovative cold bacterial inactivation technology developed in recent years (Cai et al, 2023;Soni et al, 2021) to mitigate the drawbacks of cold plasma, such as uneven treatment to unregular food, side effects on the appearance of fruits and constraints on size of products (Gao et al, 2021). PAW offers the benefits of convenience, minimal chemical residue, effective inactivation of pathogens (Pourbagher et al, 2023), biodegradable characteristic, and negligible impact on food quality (Xiao et al, 2023), showing promising effect on postharvest preservation (Liu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of integrated systems of precooling and plasma‐activated water‐based bacterial inactivation

Liu,

Li,

et al. 2024

J Food Process Engineering

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Plasma‐activated water (PAW) is produced by treating aqueous solution with cold plasma. PAW is rich in reactive oxygen and nitrogen species, making it a safe and efficient approach for the inactivation of pathogens. In this paper, two types of integrated systems of precooling and PAW‐based bacterial inactivation for fruits and vegetables were proposed. One is cold water precooling (CWP) and PAW, the other is differential pressure precooling (DPP) and PAW. The influencing factors of PAW preparation and the bacterial inactivation effect of PAW suspension were experimentally investigated. The results demonstrated that with the increase in preparation time, the pH decreased, with a concurrent increase in temperature, electrical conductivity, and redox potential. The physicochemical properties of PAW were affected by temperature, with the optimal temperature being about 17°C. As the preparation time and bacterial inactivation time increased, the decontamination effect of PAW against Escherichia coli increased in suspension bacterial inactivation. Conversely, with the decrease in PAW temperature, the bacterial inactivation effect weakened. Furthermore, PAW was applied through CWP and DPP combined with PAW for precooling snow peas. Soaking CWP showed a 2.1 log reduction of background bacteria after 10 days of storage. Spraying CWP showed a 1.1 log reduction of background bacteria after 5 days of storage. DPP showed a 0.8 log reduction of background bacteria after 10 days of storage, and the appearance of snow peas surpassed those of the control group. Integrated systems of precooling and PAW‐based bacterial inactivation indicated promising effects on maintaining the safety and quality of snow peas.Practical applicationsPAW is a sterilization method with the advantage of easy preparation, low cost, minimal chemical residue, and effective sterilization. PAW could be produced simply by discharge on the tap water, which is very practical for its up‐scale application. In this study, different parameters on the physicochemical properties of PAW were evaluated, which was helpful in designing industrial PAW‐producing equipment. Besides, integrated systems of precooling and PAW sterilization for fruits and vegetables were proposed, which showed prominent sterilization and good preservation effects. The integrated systems could maintain the freshness of fruits and vegetables and prevent bacterial contamination during precooling by combining PAW sterilization and precooling, which will help extend the shelf lives of fruits and vegetables. In addition, this combination will prevent agricultural product waste and maintain the safety of fruits and vegetables.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of integrated systems of precooling and plasma‐activated water‐based bacterial inactivation

Liu,

Li,

et al. 2024

J Food Process Engineering

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“…The industrial, medical, and national defense fields widely use pulse discharge in water technology, such as nanomaterial preparation, water quality treatment, and shale gas plugging removal [1][2][3]. The mechanism of this is the liquid electric effect accompanied by physical effects such as light, heat, and force [4,5].…”

Section: Introductionmentioning

confidence: 99%

Novel method for identifying the stages of discharge underwater based on impedance change characteristic

GAO 高,

KANG 康,

GONG 龚

et al. 2024

Plasma Sci. Technol.

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It is difficult to determine the discharge stages in a fixed time of repetitive discharge underwater due to the arc formation process being susceptible to external environmental influences. This paper proposes a novel underwater discharge stage identification method based on the Strong Tracking Filter (STF) and impedance change characteristics. The time-varying equivalent circuit model of the discharge underwater is established based on the plasma theory analysis of the impedance change characteristics and mechanism of the discharge process. The STF is used to reduce the randomness of the impedance of repeated discharges underwater, and then the universal identification resistance data is obtained. Based on the resistance variation characteristics of the discriminating resistance of the pre-breakdown, main, and oscillatory discharge stages, the threshold values for determining the discharge stage are obtained. These include the threshold values for the resistance variation rate (K) and the moment (t). Experimental and error analysis results demonstrate the efficacy of this innovative method in discharge stage determination, with a maximum mean square deviation of Scr less than 1.761.

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“…Atmospheric pressure plasma interacting with liquids exists in various fields, such as biomedicine [1][2][3], environmental protection [4][5][6], food agriculture [7,8], and analytical chemistry [9,10]. Plasma-liquid interactions are capable of generating a large number of reactive species that play a key role in applications [11,12], such as hydroxyl radicals (OH), atomic oxygen (O), and hydrogen peroxide (H 2 O 2 ).…”

Section: Introductionmentioning

confidence: 99%

Effect of liquid surface depression size on discharge characteristics and chemical distribution in the plasma-liquid anode system

LING 凌,

DAI 戴,

CHANG 常

et al. 2024

Plasma Sci. Technol.

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Atmospheric pressure plasma-liquid interactions exist in a variety of applications, including wastewater treatment, wound sterilization, and disinfection. In practice, the phenomenon of liquid surface depression will inevitably appear. The applied gas will cause a depression on the liquid surface, which will undoubtedly affect the plasma generation and further affect the application performance. However, the effect of liquid surface deformation on the plasma is still unclear. In this study, numerical models are developed to reveal the mechanism of liquid surface depressions affecting plasma discharge characteristics and the consequential distribution of plasma species, and further study the influence of liquid surface depressions of different sizes generated by different helium flow rates on the plasma. Results show that the liquid surface deformation changes the initial spatial electric field, resulting in the rearrangement of electrons on the liquid surface. The charges deposited on the liquid surface further increase the degree of distortion of the electric field. Moreover, the electric field and electron distribution affected by the liquid surface depression significantly influence the generation and distribution of active species, which determines the practical effectiveness of the relevant applications. This work explores the phenomenon of liquid surface depression, which has been neglected in previous related work, and contributes to further understanding of plasma-liquid interactions, providing better theoretical guidance for related applications and technologies.

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Effect of different process conditions on the physicochemical and antimicrobial properties of plasma-activated water

Cited by 8 publications

References 42 publications

Experimental investigation of integrated systems of precooling and plasma‐activated water‐based bacterial inactivation

Experimental investigation of integrated systems of precooling and plasma‐activated water‐based bacterial inactivation

Novel method for identifying the stages of discharge underwater based on impedance change characteristic

Effect of liquid surface depression size on discharge characteristics and chemical distribution in the plasma-liquid anode system

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