Eur. Phys. J. Appl. Phys.
Volume 49, Number 1, January 2010
Focus on Plasma Processes
|Number of page(s)||5|
|Section||Focus on Plasma Processes|
|Published online||26 November 2009|
Instrumentation for a plasma needle applied to E. coli bacteria elimination
Instituto Nacional de Investigaciones Nucleares, Laboratorio de Física de Plasmas, AP 18-1027, 11801 México D.F., Mexico
2 Instituto Tecnológico de Toluca, AP 890, Toluca, Estado de México, Mexico
3 Universidad de Guadalajara, CUCEI, Departamento de Farmacobiología, Blvd. Marcelino Barragán No. 1421 esq. Calz. Olímpica, Guadalajara, Mexico
Corresponding author: email@example.com
Accepted: 6 November 2009
Published online: 26 November 2009
Microplasmas are nowadays a powerful tool with multiple practical applications. The performance of a specific instrumentation for a plasma needle capable of producing non-thermal plasmas and a DBD reactor able to produce atmospheric pressure plasmas, both of them designed and already constructed, is reported. These devices operate at 13.56 MHz and are driven by a specifically built radio frequency (RF) resonant converter. The reactors, which operate at atmospheric pressure in a He-air gas mixture at a 1.5 SLPM flow, have been successfully applied to eliminate E. coli bacteria. In the needle case, bacterial samples were submitted typically to a 500 V peak voltage plasma discharge for 120 s. In the DBD treatment, the samples were processed with typical 750 V peak voltage plasma discharges for 80 s. The sample pH was used as a criterion to measure the effectiveness of the plasma treatment, in such a way that the return to the basal pH value after the treatment can be assumed as the validation of the complete bacterial elimination.
PACS: 52.80.Pi – High-frequency and RF discharges / 52.50.Dg – Plasma sources / 87.90.+y – Other topics in biological and medical physics
© EDP Sciences, 2009
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