Cold Atmospheric Plasma Inactivation of Microbial Spores Compared on Reference Surfaces and Powder Particles
| Autor: | Maria Consuelo Pina-Pérez, Christoph Ellert, Michael Beyrer, Alan Howling, David Martinet, Irina Smeu |
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| Rok vydání: | 2020 |
| Předmět: |
spores
uv-c Atmospheric-pressure plasma Dielectric barrier discharge dielectric barrier discharge Industrial and Manufacturing Engineering resistance Matrix (chemical analysis) 03 medical and health sciences 0404 agricultural biotechnology low-pressure plasma Safety Risk Reliability and Quality D-value foodborne pathogens 0303 health sciences 030306 microbiology Chemistry glow-discharge Process Chemistry and Technology fungi temperature 04 agricultural and veterinary sciences decontamination Contamination 040401 food science direct atmospheric plasma Surface energy Spore bacillus-subtilis spores inactivation kinetics Chemical engineering Electrode impact heat Food Science |
| Zdroj: | Food and Bioprocess Technology |
| ISSN: | 1935-5149 1935-5130 |
| DOI: | 10.1007/s11947-020-02438-5 |
| Popis: | Heat-resistant spores on a dry, heat- and water-sensitive food matrix are difficult to inactivate. Radioactive or X-ray exposure is allowed and accepted only for some selected commodities. Non-thermal atmospheric pressure plasma treatments could offer an efficient, fast, and chemical-free solution. The effectiveness of direct contact cold atmospheric plasma (CAP) generated by a dielectric barrier discharge (DBD) device and air as process gas was evaluated against spores of Bacillus spp., Geobacillus spp., and Penicillium spp. A maximum of 3 log10 cycles of inactivation was achieved for B. coagulans spores exposed for only 10 s at low surface energy of 0.18 W/cm2 determined directly at the electrodes. This corresponds to an initial decimal reduction time of D1 = 0.1 min. Spores of B. subtilis are the most resistant amongst the studied strains (D1 = 1.4 min). The determining parameter in the modeling of the inactivation curve is surface energy. Non-porous, native starch granules or shells from diatoms, a highly porous material, were also contaminated with spores and treated by DBD CAP. The inactivation level was significantly reduced by the presence of powders. Considering plasma diagnostics, it can be concluded that the spore shell is the primary and main target for a plasma-induced inactivation. The inactivation affect scales with surface energy and can be controlled directly via process time and/or discharge power. |
| Databáze: | OpenAIRE |
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