STUDIES ON PATHOGEN INACTIVATION BY GAS DISCHARGE PLASMAS IN LOW GAS PRESSURE

Зохиогч:  Д.Пүрэвдорж

Хамтран зохиогч:

Үйл явц: Бичиж хэвлүүлсэн

Бүтээлийн товч тайлбар:

Inactivation of harmful pathogens using physical and chemical methods is important for thermo-sensitive materials used in the medical and food industries. However, the existing low temperature sterilization methods are not always desirable, the widely used ethylene oxide is highly absorbable in plastic materials and know for its intrinsic toxicity as carcinogenic, ionizing radiation may cause undesirable changes in the material during the sterilization.

Therefore in the present dissertation work, pathogen inactivation kinetics by microwave induced gas discharge plasmas were being investigated for different microwave power densities, the type of microorganisms, gas feed composition and the external factors affecting the pathogen survival in low gas pressure. Gas discharge plasmas demonstrated a notable advantage as a surface sterilizer over the existing methods that decontamination and detoxifying of contaminated matters can be achieved at one time of sterilization cycle. For the first time, we have observed that atmospheric air used for generation of discharge plasma in low gas pressure is highly sporicidal and its destruction efficiency was greatly upgraded (up to 4.5 log reduction of radiation resistant Bacillus pumilus spores for 30 min of plasma treatment at 4.21 W/cm3 microwave power density), when mole fraction of water vapor in the air feed was humidity controlled from 0.00 to 0.05. Consequently this highly sporicidal phenomena of air discharge plasma was speculated due to the generation of hydroxyl free radicals, which has directed in a new approach of sterilizing contaminated matters by using reactive plasma species (free radicals or neutral metastable species).

Хэвлүүлсэн газар: Kyushu University, Fukuoka, Japan

Хэвлүүлсэн огноо: 2002/08/01

Хуудасний тоо: 50

Түлхүүр үг:


Бүтээл нэмсэн:Д.Пүрэвдорж

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