Sterilization in liquids by air plasma under intermittent discharge

In recent years, cold atmospheric plasma has received attention for medical applications like sterilization, injure treatment, and cancer cell treatment. Plasma sterilization is effective against a wide range of microorganisms. Plasma sterilization devices for contact lens have developed over the ye...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Kairi MURAMATSU, Takehiko SATO, Tomoki NAKAJIMA, Toshikatsu NAGASAWA, Tatsuyuki NAKATANI, Shigeru FUJIMURA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	plasma dielectric barrier discharge sterilization spore reactive species Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/d276c320484b43f2bfaf5780bea91829
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:d276c320484b43f2bfaf5780bea91829
record_format	dspace
spelling	oai:doaj.org-article:d276c320484b43f2bfaf5780bea918292021-11-29T05:52:02ZSterilization in liquids by air plasma under intermittent discharge2187-974510.1299/mej.19-00431https://doaj.org/article/d276c320484b43f2bfaf5780bea918292020-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/1/7_19-00431/_pdf/-char/enhttps://doaj.org/toc/2187-9745In recent years, cold atmospheric plasma has received attention for medical applications like sterilization, injure treatment, and cancer cell treatment. Plasma sterilization is effective against a wide range of microorganisms. Plasma sterilization devices for contact lens have developed over the years. The purpose of this study is to clarify sterilization characteristics under high ozone, low nitric acid, and nitrous acid concentration in liquids. These concentrations are caused by a new cycle of intermittent discharges. Sterilization efficacy is evaluated by inactivating bacillus spores. Concentrations of HNO3, HNO2 and O3 in water were measured using a pack test. Dielectric surface temperature is measured using a thermocouple and thermography to study relationships between the concentration and the temperature. Sterilization of spores in water was achieved for 80 min. Increasing ozone concentration promotes the generation of hydrogen peroxide, which is a well-known factor for sterilization, and •OH, which has strong oxidizing power, however, the concentration of hydrogen peroxide is too low for sterilization, and the life time of •OH is as short as microseconds. Meanwhile, a decrease in the concentration of nitric acid and nitrous acid suppresses the formation of peroxynitrite, which has very strong oxidizing powers and a lifetime of 1 sec. These results suggest a critical role of peroxynitrite in sterilization.Kairi MURAMATSUTakehiko SATOTomoki NAKAJIMAToshikatsu NAGASAWATatsuyuki NAKATANIShigeru FUJIMURAThe Japan Society of Mechanical Engineersarticleplasmadielectric barrier dischargesterilizationsporereactive speciesMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 1, Pp 19-00431-19-00431 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	plasma dielectric barrier discharge sterilization spore reactive species Mechanical engineering and machinery TJ1-1570
spellingShingle	plasma dielectric barrier discharge sterilization spore reactive species Mechanical engineering and machinery TJ1-1570 Kairi MURAMATSU Takehiko SATO Tomoki NAKAJIMA Toshikatsu NAGASAWA Tatsuyuki NAKATANI Shigeru FUJIMURA Sterilization in liquids by air plasma under intermittent discharge
description	In recent years, cold atmospheric plasma has received attention for medical applications like sterilization, injure treatment, and cancer cell treatment. Plasma sterilization is effective against a wide range of microorganisms. Plasma sterilization devices for contact lens have developed over the years. The purpose of this study is to clarify sterilization characteristics under high ozone, low nitric acid, and nitrous acid concentration in liquids. These concentrations are caused by a new cycle of intermittent discharges. Sterilization efficacy is evaluated by inactivating bacillus spores. Concentrations of HNO3, HNO2 and O3 in water were measured using a pack test. Dielectric surface temperature is measured using a thermocouple and thermography to study relationships between the concentration and the temperature. Sterilization of spores in water was achieved for 80 min. Increasing ozone concentration promotes the generation of hydrogen peroxide, which is a well-known factor for sterilization, and •OH, which has strong oxidizing power, however, the concentration of hydrogen peroxide is too low for sterilization, and the life time of •OH is as short as microseconds. Meanwhile, a decrease in the concentration of nitric acid and nitrous acid suppresses the formation of peroxynitrite, which has very strong oxidizing powers and a lifetime of 1 sec. These results suggest a critical role of peroxynitrite in sterilization.
format	article
author	Kairi MURAMATSU Takehiko SATO Tomoki NAKAJIMA Toshikatsu NAGASAWA Tatsuyuki NAKATANI Shigeru FUJIMURA
author_facet	Kairi MURAMATSU Takehiko SATO Tomoki NAKAJIMA Toshikatsu NAGASAWA Tatsuyuki NAKATANI Shigeru FUJIMURA
author_sort	Kairi MURAMATSU
title	Sterilization in liquids by air plasma under intermittent discharge
title_short	Sterilization in liquids by air plasma under intermittent discharge
title_full	Sterilization in liquids by air plasma under intermittent discharge
title_fullStr	Sterilization in liquids by air plasma under intermittent discharge
title_full_unstemmed	Sterilization in liquids by air plasma under intermittent discharge
title_sort	sterilization in liquids by air plasma under intermittent discharge
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/d276c320484b43f2bfaf5780bea91829
work_keys_str_mv	AT kairimuramatsu sterilizationinliquidsbyairplasmaunderintermittentdischarge AT takehikosato sterilizationinliquidsbyairplasmaunderintermittentdischarge AT tomokinakajima sterilizationinliquidsbyairplasmaunderintermittentdischarge AT toshikatsunagasawa sterilizationinliquidsbyairplasmaunderintermittentdischarge AT tatsuyukinakatani sterilizationinliquidsbyairplasmaunderintermittentdischarge AT shigerufujimura sterilizationinliquidsbyairplasmaunderintermittentdischarge
_version_	1718407613769580544

Sterilization in liquids by air plasma under intermittent discharge

Ejemplares similares