Table 3.

Effects of cold plasma treatment on Gram-negative bacteria inoculated onto the surface of agarized medium. Values with different letters (a–c) within the same column differ significantly (P < 0.05)

Type of plasma	Exposure time (min)	Log reduction
		Escherichia coli	Yersinia enterocolitica	Pseudomonas fluorescens
Helium	2	0.44 ± 0.13 b	1.98 ± 0.02 c	0.01 ± 0.01 a
	5	1.99 ± 0.04 c	1.97 ± 0.04 c	0.38 ± 0.13 b
	10	2.01 ± 0.02 c	2.00 ± 0.01 c	1.97 ± 0.06 c
Argon	2	0.01 ± 0.01 a	0.34 ± 0.09 b	0.01 ± 0.00 a
	5	0.49 ± 0.11 b	1.12 ± 0.07 c	0.01 ± 0.00 a
	10	1.99 ± 0.03 c	1.96 ± 0.04 c	0.63 ± 0.14 b