. 2014 Aug 31;34(4):525–532. doi: 10.5851/kosfa.2014.34.4.525

Table 3. Effect of ozone exposure on TBARS, catalase activity and glutathione peroxidase activity of ground Hanwoo beef inoculated with E. coli O157:H7 at refrigeration temperature.

Bacteria	Inoculation with E. coli O157:H7	Ozone treatment	Storage (d)
Bacteria	Inoculation with E. coli O157:H7	Ozone treatment	0	1	2	3
TBARS (mg MA/kg sample)	No	No	0.66±0.02^B	0.71±0.01^cAB	0.72±0.02^cA	0.74±0.01^bA
	No	Yes	0.66±0.02^B	0.76±0.03^bA	0.75±0.01^bA	0.79±0.06^abA
	Yes	No	0.67±0.05^B	0.72±0.02^cA	0.73±0.02^cA	0.74±0.02^bA
	Yes	Yes	0.67±0.05^B	0.81±0.02^aA	0.80±0.02^aA	0.84±0.05^aA
Catalase/CAT activity (U/g sample)	No	No	449.2±27.7^A	438.8±24.6^A	411.2±42.9^abB	403.6±28.07^abB
	No	Yes	449.2±27.7^A	426.4±24.4^B	397.4±31.2^bC	373.6±41.78^bC
	Yes	No	449.2±27.7^A	447.1±49.1^A	422.2±23.9^aB	416.7±43.40^aB
	Yes	Yes	449.2±27.7^A	431.9±40.3^A	399.5±27.7^bB	377.7±56.35^bC
Glutathione peroxidase (GPx) activity (U/g sample)	No	No	1.26±0.10^A	1.24±0.11^A	1.23±0.15^A	0.86±0.22^abB
	No	Yes	1.26±0.10^A	1.25±0.11^A	1.17±0.28^A	0.71±0.33^bB
	Yes	No	1.26±0.10^A	1.26±0.11^A	1.27±0.14^A	0.92±0.17^aB
	Yes	Yes	1.26±0.10^A	1.21±0.13^A	1.18±0.15^A	0.80±0.23^abB

Mean values±standard deviation.

^a-cMeans in the same column followed by different letters in superscript lower-case are significantly different (p<0.05).

^A-CMeans in the same row followed by different letters in superscript upper-case are significantly different (p<0.05).