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Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:哈尔滨工业大学学报

Volume:41

Issue:9

Page Number:184-187

ISSN No.:0367-6234

Abstract:The sterilizing effect and the inactivation mechanisms of low
   temperature atmospheric pressure heli-um plasma generated by dielectric
   barrier discharge and atmospheric cold plasma jet generated by capillary
   at-mospheric dielectric barrier discharge on baker' s yeast were
   analyzed and compared. The relationship of sur-vival number versus
   plasma treatment time and that of yeast pH value versus plasma treatment
   time using dif-ferent plasmas were studied. The morphology of the yeast
   was observed by scanning electron microscopy. Re-sults demonstrate that
   two kinds of plasma have strong sterilization effect on the yeast. At
   least a 7 log_(10) reduction in the survival number after being treated
   with plasma generated by dielectric barrier discharge and at least a 8
   log _(10)reduction in the survival number after being treated with cold
   plasma jet generated by capillar-y atmospheric dielectric barrier
   discharge are realized. Simultaneously, pH value has remarkable change
   after two kinds of plasma treatment and it is more remarkably changed
   for atmospheric cold plasma jet generated by capillary atmospheric
   dielectric barrier discharge. The yeast treated with two kinds of plasma
   ruptures com-pletely. It is demonstrated that the sterilizing effect of
   cold plasma jet generated by capillary atmospheric die-lectric barrier
   discharge is stronger than that generated by dielectric barrier
   discharge. The inactivation mecha-nisms are concerned with the rupture
   of the yeast and the pH value change.

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