Plasma-activated water: antibacterial activity and artifacts?

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Abstract

Broad biological activities of “plasma-activated water” (PAW) have drawn great attentions recently. Treatment of water using gas discharge plasma led to acidic solutions with excellent and broad antibacterial activity. Because PAW caused severe membrane damages in bacteria and diffused freely in extracellular matrix, PAW also demonstrated good anti-biofilm activity. However, further studies revealed that trace amounts of metal ions (mainly copper and zinc) in PAW brought by plasma treatment played key roles in bacteria inactivation. The contribution of metal ions to the antibacterial activity varied among PAWs from different working gases. However, solution acidification caused by reactive species in plasma was essential. The experimental results demonstrated that potential artifacts in reported biological activities of PAWs should be considered.

Original languageEnglish
Pages (from-to)26699-26706
Number of pages8
JournalEnvironmental Science and Pollution Research
Volume25
Issue number27
DOIs
StatePublished - 1 Sep 2018

Keywords

  • Anti-biofilm activity
  • Antibacterial activity
  • Biofilm
  • Metal
  • Non-thermal plasma
  • Plasma-activated water

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