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Low-temperature air plasma jet for inactivation of bacteria (S. Aureus and E. Coli) and fungi (C. Albicans and T. Rubrum)

Generally, most of the setups of plasma jet adopted rare gases (e.g., helium and argon) as the working gas. The drawback of using rare gases is that it cannot be continuously used as the gas tank volume is limited, and the cost of using rare gases to yield plasma jet is also higher. Thus, a plasma j...

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Main Authors: Zhang, Xinhua, Kok, Jun Liew, Chong, Chun Shiong, Cai, Xiaohong, Chang, Zhidong, Jia, Hao, Liu, Peng, He, Hua, Liu, Wei, Li, Yuexian
Format: Article
Language:English
Published: Polska Akademia Nauk 2023
Subjects:
QH301 Biology
Online Access:http://eprints.utm.my/104874/1/ChongChunShiong2023_LowTemperatureAirPlasmaJetforInactivation.pdf
http://eprints.utm.my/104874/
http://dx.doi.org/10.12693/APhysPolA.143.12
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spelling my.utm.1048742024-03-25T09:13:13Z http://eprints.utm.my/104874/ Low-temperature air plasma jet for inactivation of bacteria (S. Aureus and E. Coli) and fungi (C. Albicans and T. Rubrum) Zhang, Xinhua Kok, Jun Liew Chong, Chun Shiong Cai, Xiaohong Chang, Zhidong Jia, Hao Liu, Peng He, Hua Liu, Wei Li, Yuexian QH301 Biology Generally, most of the setups of plasma jet adopted rare gases (e.g., helium and argon) as the working gas. The drawback of using rare gases is that it cannot be continuously used as the gas tank volume is limited, and the cost of using rare gases to yield plasma jet is also higher. Thus, a plasma jet using solely air as the working gas could be a potentially promising solution. In this study, a low-temperature air plasma jet using only air as gas was developed. The device was optimized by adjusting the control circuit (deadband, current, voltage and duty ratio), frequencies (50–350 kHz), air pump flow-rate (0–8 L/min), and geometric size of each component. The spectrum of the low-temperature air plasma jet revealed that the main components are N2, and the radicals N/NO occupy 92.5%, while O and O+ occupy less than 7.5%. Under the optimal conditions, where the discharging frequency was at 120 kHz and the output voltage was set to 5–10 kV, its inactivation ability toward microorganisms, such as Staphylococcus aureus, Escherichia coli, Trichophyton rubrum, and Candida albicans was assessed. In addition, the inactivation ability of low-temperature air plasma jet and ozone toward microorganisms was compared. Low-temperature air plasma jet and ozone were applied to microorganisms for a range of treatment times, and the results showed different degrees of microbiological inactivation. The inhibition zones formed on the agar plate were 3.8 cm (Staphylococcus aureus), 3.3 cm (Escherichia coli), 5.3 cm (Trichophyton rubrum), and 3.2 cm (Candida albicans) when a 15 min low-temperature air plasma jet was applied. Comparatively, the diameters of the inhibition zone after 15 min of ozone exposure were 3.8, 5.0, 0.9, and 0.0 cm, respectively. Collectively, the low-temperature air plasma jet showed comparable efficacy to ozone in terms of inactivation ability. This low-temperature air plasma jet demonstrated its potential to be used for medical applications involving the inactivation of microorganisms. Polska Akademia Nauk 2023 Article PeerReviewed application/pdf en http://eprints.utm.my/104874/1/ChongChunShiong2023_LowTemperatureAirPlasmaJetforInactivation.pdf Zhang, Xinhua and Kok, Jun Liew and Chong, Chun Shiong and Cai, Xiaohong and Chang, Zhidong and Jia, Hao and Liu, Peng and He, Hua and Liu, Wei and Li, Yuexian (2023) Low-temperature air plasma jet for inactivation of bacteria (S. Aureus and E. Coli) and fungi (C. Albicans and T. Rubrum). Acta Physica Polonica A, 143 (1). pp. 12-18. ISSN 0587-4246 http://dx.doi.org/10.12693/APhysPolA.143.12 DOI : 10.12693/APhysPolA.143.12
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic QH301 Biology
spellingShingle QH301 Biology
Zhang, Xinhua
Kok, Jun Liew
Chong, Chun Shiong
Cai, Xiaohong
Chang, Zhidong
Jia, Hao
Liu, Peng
He, Hua
Liu, Wei
Li, Yuexian
Low-temperature air plasma jet for inactivation of bacteria (S. Aureus and E. Coli) and fungi (C. Albicans and T. Rubrum)
description Generally, most of the setups of plasma jet adopted rare gases (e.g., helium and argon) as the working gas. The drawback of using rare gases is that it cannot be continuously used as the gas tank volume is limited, and the cost of using rare gases to yield plasma jet is also higher. Thus, a plasma jet using solely air as the working gas could be a potentially promising solution. In this study, a low-temperature air plasma jet using only air as gas was developed. The device was optimized by adjusting the control circuit (deadband, current, voltage and duty ratio), frequencies (50–350 kHz), air pump flow-rate (0–8 L/min), and geometric size of each component. The spectrum of the low-temperature air plasma jet revealed that the main components are N2, and the radicals N/NO occupy 92.5%, while O and O+ occupy less than 7.5%. Under the optimal conditions, where the discharging frequency was at 120 kHz and the output voltage was set to 5–10 kV, its inactivation ability toward microorganisms, such as Staphylococcus aureus, Escherichia coli, Trichophyton rubrum, and Candida albicans was assessed. In addition, the inactivation ability of low-temperature air plasma jet and ozone toward microorganisms was compared. Low-temperature air plasma jet and ozone were applied to microorganisms for a range of treatment times, and the results showed different degrees of microbiological inactivation. The inhibition zones formed on the agar plate were 3.8 cm (Staphylococcus aureus), 3.3 cm (Escherichia coli), 5.3 cm (Trichophyton rubrum), and 3.2 cm (Candida albicans) when a 15 min low-temperature air plasma jet was applied. Comparatively, the diameters of the inhibition zone after 15 min of ozone exposure were 3.8, 5.0, 0.9, and 0.0 cm, respectively. Collectively, the low-temperature air plasma jet showed comparable efficacy to ozone in terms of inactivation ability. This low-temperature air plasma jet demonstrated its potential to be used for medical applications involving the inactivation of microorganisms.
format Article
author Zhang, Xinhua
Kok, Jun Liew
Chong, Chun Shiong
Cai, Xiaohong
Chang, Zhidong
Jia, Hao
Liu, Peng
He, Hua
Liu, Wei
Li, Yuexian
author_facet Zhang, Xinhua
Kok, Jun Liew
Chong, Chun Shiong
Cai, Xiaohong
Chang, Zhidong
Jia, Hao
Liu, Peng
He, Hua
Liu, Wei
Li, Yuexian
author_sort Zhang, Xinhua
title Low-temperature air plasma jet for inactivation of bacteria (S. Aureus and E. Coli) and fungi (C. Albicans and T. Rubrum)
title_short Low-temperature air plasma jet for inactivation of bacteria (S. Aureus and E. Coli) and fungi (C. Albicans and T. Rubrum)
title_full Low-temperature air plasma jet for inactivation of bacteria (S. Aureus and E. Coli) and fungi (C. Albicans and T. Rubrum)
title_fullStr Low-temperature air plasma jet for inactivation of bacteria (S. Aureus and E. Coli) and fungi (C. Albicans and T. Rubrum)
title_full_unstemmed Low-temperature air plasma jet for inactivation of bacteria (S. Aureus and E. Coli) and fungi (C. Albicans and T. Rubrum)
title_sort low-temperature air plasma jet for inactivation of bacteria (s. aureus and e. coli) and fungi (c. albicans and t. rubrum)
publisher Polska Akademia Nauk
publishDate 2023
url http://eprints.utm.my/104874/1/ChongChunShiong2023_LowTemperatureAirPlasmaJetforInactivation.pdf
http://eprints.utm.my/104874/
http://dx.doi.org/10.12693/APhysPolA.143.12
_version_ 1794545941358837760
score 13.211869

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