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2 2009

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Study of low temperature inactivation of spores using microwave excited air plasma

Nagatsu M., Singh M. K., Zhao Y., Fujioka Y., Ogino A.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

Vol. 3, No. 4

108-111

In the present study, we investigated the inactivation characteristics and contribution of different inactivating factors generated in a low temperature and low pressure nitrogen, oxygen and air-simulated plasma for the inactivation of Geobacillus stearothermophilus spores. We used three optical filters i.e. thin quartz (lambda>180 nm), lithium fluorine (LiF, lambda>120 nm) and Pyrex glass (lambda>300 nm) plates to identify the most efficient wavelength range. The effect of optical radiations alone was studied through placing a small isolated and evacuated chamber with spore sample inside the plasma chamber.

Investigation of low temperature plasma capabilities to modify the structure and function of bio-polymers

Motrescu I., Hara T., Ogino A., Tanaka S., Fujiwara T., Kawagishi H., Kodani S., Popa G., Nagatsu M.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

Vol. 3, No. 4

150-152

The possibility to modify biopolymers using low temperature plasma is investigated. Two types of plasma are employed in this study: an atmospheric pressure plasma and a low pressure microwave plasma. In both cases changes of the structure and function of the exposed molecules are reported, the effects being stronger for the low-pressure plasma irradiation.