Low-Temperature Air Plasma Jet for Inactivation of Bacteria <i>S. Aureus</i> and <i>E. Coli</i>) and Fungi (<i>C. Albicans</i> and <i>T. Rubrum</i>)

Generally, most of the setups plasma jet adopted rare gases (e.g., helium and argon) as working gas. The drawback using is that it cannot be continuously used gas tank volume limited, cost to yield also higher. Thus, a solely air could potentially promising solution. In this study, low-temperature only was developed. device optimized by adjusting control circuit (deadband, current, voltage duty ratio), frequencies (50-350 kHz), pump flow-rate (0-8 L/min), geometric size each component. spectrum revealed main components are N2, radicals N/NO occupy 92.5%, while O O+ less than 7.5%. Under optimal conditions, where discharging frequency at 120 kHz output set 5-10 kV, its inactivation ability toward microorganisms, such Staphylococcus aureus, Escherichia coli, Trichophyton rubrum, Candida albicans assessed. addition, ozone microorganisms compared. Low-temperature were applied for range treatment times, results showed different degrees microbiological inactivation. inhibition zones formed on agar plate 3.8 cm (Staphylococcus aureus), 3.3 (Escherichia coli), 5.3 (Trichophyton rubrum), 3.2 (Candida albicans) when 15 min applied. Comparatively, diameters zone after exposure 3.8, 5.0, 0.9, 0.0 cm, respectively. Collectively, comparable efficacy in terms ability. This demonstrated potential medical applications involving microorganisms.