플라즈마를 이용한 수용액 내에서의 살모넬라 살균

Abstract

Since plasma was identified in 1879, it has been applied into wide field, specially, in material processing like etching and deposition. Recently, non-thermal plasma applications are growing fast in biological and medical fields. Non-thermal plasma is an excellent source of many germicidal factors such as UV radiation, ions, electrons, excited atoms, molecules and so on. Both the plasma physics research group and biomedical research group showed a high interest of ？cold？ plasma sterilization. Non-thermal plasmas also have been used in the other medical field like tissue treatment, blood coagulation, surface modification, and treatment of skin cancer. Some of these processes also are accompanied by sterilization. Compared to the conventional water sterilization methods such as irradiation, heat, chemicals (like chlorination, ozonation), high pressure, filtration, plasma sterilization has its own merit, for example, high efficiency, low cost and less by-product.the most recently investigation represented that plasma sterilization can be more efficient in acidic environment then distilled water. On the other hand, some researchers purported that in their plasma treatment of water, in alkaline solutions the efficiency of oxidation of phenol is much high than under acidic condition and the density of free hydroxyl radical (OH？), which is considered one of the most important inactivation factors of plasma water treatment, is also much higher. Therefore, a wider range of pH value was studied and compared. First, non-thermal air plasma sterilization of Salmonella in liquid solutions, whose pH values were from 1 to 14, was presented in this work. The different phenomenon appeared between the acidic solutions and the alkaline solutions expressly. Therefore, the complicated distinct bacterial inactivation mechanisms were discussed after that. The pH value changes after the plasma exposure were also tested to estimate the plasma effect. Nevertheless, the determinations of the primary factors of plasma water sterilization and the synergisms between the factors still need a further study.