POTENTIAL USE OF 18 TESLA STATIC AND PULSED MAGNETIC FIELDS ON ESCHERICHIA COLI AND SACCHAROMYCES CEREVISIAE

Escherichia coli and Saccharomyces cerevisiae were subjected to 18 Tstatic and pulsed magnetic fields at different temperatures in either phosphate buffer, Mcllvaine buffer, or peptonated water. Colony forming units were recorded after incubation in nutrient and Violet Red Bile agar for E. coli and potato dextrose agar for S. cerevisiae. No inactivation or cell injury was detected due to the influence of the magnetic field whether static or pulsed. As expected, at higher temperatures both inactivation and cell injury were increased. Although further research is needed, magnetic field technology at 18 T or lower does not appear as a feasible option for processing foods. Escherichia coli et Saccharomyces cerevisiae sont soumis a un champ magnetique de 18 T statique et pulse, a differentes temperature et dans differents milieux. Aucune inactivation ou lesion n'est detectee sauf a haute temperature. Ce traitement en champ magnetique n'apparait donc pas etre une technique satisfaisante pour traiter les aliments.