Abstract
Dry powder food ingredients imported to Japan contain large amounts of viable bacteria and coliform bacteria, and we need a simple, low-cost, dry nonthermal decontamination method without spoiling nutrients, color, fragrance, and flavor. In this study, it is shown that the decontamination performance against viable bacteria and coliform bacteria is proportional to the plasma irradiation time when OH and O3 radicals are incident on the dry powder food ingredients placed in an atmospheric-pressure nonequilibrium DC pulse discharge Ar + O2 mixture gas plasma jet. Our study revealed that there is a correlation between the plasma irradiation time and DC pulse frequency increase and the decontamination effect on the general bacterial count.
Highlights
Introduced in 1991 by the Japanese government, the FOSHU (Foods for Specified Health Use) system [1,2,3,4,5] expanded the food market including supplements and Chinese herbal medicine. e supply of food ingredients including supplements and Chinese herbal medicine greatly depends on both domestic production and importation. e companies taking part in FOSHU market are lately experiencing problems—especially food poisoning caused by orally transmitted bacteria—with large amounts of viable bacteria and coliform bacteria in the dry powder food ingredients imported from abroad
A simple, lowcost, dry nonthermal decontamination method is needed without affecting the qualities such as nutrients, color, fragrance, and flavor in the facilities producing FOSHU using dry powder food ingredients containing viable bacteria and coliform bacteria
To sterilize viable bacteria and coliform bacteria without spoiling nutrients, color, fragrance, and flavor, a new methodology using atmospheric-pressure nonequilibrium DC pulse discharge plasma is proposed for use at low temperatures so as to perform the irradiation of OH radicals to dry powder food ingredients. erefore, it is shown that the decontamination effect against viable bacteria and coliform bacteria in the dry powder food ingredients increases proportionally to the irradiation time and pulse frequency of the plasma irradiated using an atmospheric-pressure nonequilibrium DC pulse discharge Ar + O2 mixture gas plasma jet generated by high-frequency DC pulsed power supply
Summary
Toshifumi Yuji ,1 Kenichi Nakabayashi, Hiroyuki Kinoshita, Narong Mungkung ,3 Yoshifumi Suzaki, Sarizam Mamat, and Hiroshi Akatsuka 6. Dry powder food ingredients imported to Japan contain large amounts of viable bacteria and coliform bacteria, and we need a simple, low-cost, dry nonthermal decontamination method without spoiling nutrients, color, fragrance, and flavor. It is shown that the decontamination performance against viable bacteria and coliform bacteria is proportional to the plasma irradiation time when OH and O3 radicals are incident on the dry powder food ingredients placed in an atmospheric-pressure nonequilibrium DC pulse discharge Ar + O2 mixture gas plasma jet. Our study revealed that there is a correlation between the plasma irradiation time and DC pulse frequency increase and the decontamination effect on the general bacterial count
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