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Plasma Medicine
SJR: 0.198 SNIP: 0.183 CiteScore™: 0.57

ISSN Print: 1947-5764
ISSN Online: 1947-5772

Plasma Medicine

DOI: 10.1615/PlasmaMed.2014011969
pages 89-100

Inactivation Treatment of Bacterial Spores Contaminated Spices by Atmospheric Plasma Jet

Yuichiro Takemura
Department of Electric and Electronic Engineering, Kinki University, Higashiosaka, Osaka, Japan
Shungo Umeji
Department of Electric and Electronic Engineering, Kinki University, Higashiosaka, Osaka, Japan
Ketaro Ito
Department of Electric and Electronic Engineering, Kinki University, Higashiosaka, Osaka, Japan
Seito Furuya
Department of Electric and Electronic Engineering, Kinki University, Higashiosaka, Osaka, Japan
M. Furuta
Osaka Prefecture University, Gakuen-cho 1-2, Sakai Naka-ku, 599-8570, Japan;

ABSTRACT

Spices are often added to various food products to utilize their flavor and aroma. The microbial contamination of imported spices has been causing problems in the food industry. Microbial spores of Bacillus species are the common contaminant in many spices. We performed inactivation processing using an atmospheric pressure plasma jet to achieve efficient inactivation of microorganisms for thermosensitive materials such as spices. Based on the results of calorimetry, the growth rate constants of plasma-irradiated black pepper were relatively smaller than those of untreated spices, and the retardation in growth of argon + carbon dioxide plasma-irradiated black pepper was extraordinarily larger than that of untreated spices, as was the growth rate constants. Based on sterility tests, the microorganisms attached to the spice could be sterilized by 5-minute treatment with an argon + carbon dioxide atmospheric plasma jet.