Table 5.

Summary. The effect of gap, gas flow rate, plasma treatment time, the occurrence of discharges at the liquid surface, and the stability of pPBS and pPBS with medium, on the concentrations of NO₂ ⁻ and H₂O₂ in pPBS and on the anti-cancer capacity of pPBS for three different cancer cell lines.

	NO2 −	H2O2	U251	LN229	U87
Gap ↗	↘	↘	↘	↘	↘
Gas flow rate ↗	↘	↗	↗	↗	↗
Effect of plasma treatment time: ± linear?	✓	✓	✓	✓	×
Discharges at the liquid surface	↗ × 2	↗ × 4	↗ ≥ × 2	↗ ≥ × 2	↗ ≥ × 2
Stability of pPBS?	✓	✓	✓	✓	✓
Stability of pPBS + medium?	✓	?	×	×	×