Table 7. Effects of different treatments on the metmyoglobin content (%, w/w) of ground pork during 9 days of refrigerated storage

Treatment	Storage time (days)
Treatment	1	3	5	7	9
UT	62.27±1.33^Aab	59.86±0.71^Aabc	60.23±0.77^Aa	57.83±3.18^Aa	53.18±5.30^Ba
HT	61.51±0.71^Aab	58.12±0.28^Bcd	58.15±0.83^Ba	56.81±0.99^Cab	54.86±0.94^Da
SCT 1	61.15±1.40^Aabc	60.32±2.32^Aab	57.45±0.79^Bab	55.35±2.17^BCab	53.68±1.37^Ca
SCT 2	60.76±1.43^Abc	58.58±0.57^Abcd	48.14±2.14^Bd	49.96±3.66^Bcd	50.04±4.84^Ba
SCT 3	59.15±3.22^Ac	53.68±0.69^ABe	42.54±5.79^Ce	47.86±5.00^BCd	52.37±6.58^ABa
SCT 4	63.26±0.49^Aa	60.65±0.43^Aa	51.50±1.26^Bcd	50.43±2.40^Bcd	50.95±3.12^Ba
SCT 5	62.12±0.43^Aab	58.91±2.31^Aabc	50.87±0.96^Bd	49.68±3.16^Bcd	49.76±3.51^Ba
SCT 6	63.18±0.21^Aa	56.97±0.50^Bd	54.30±1.37^Cbc	50.52±2.72^Dcd	51.22±2.25^Da
SCT 7	61.53±1.32^Aab	59.63±0.34^Babc	52.38±0.58^Dc	53.02±2.33^Dbc	55.93±0.50^Ca

UT: untreatment (control); HT: heat treatment (40°C for 2 h); SCT: supercritical CO₂ treatment (1, 35°C/17.2 MPa/2 h; 2, 40°C/17.2 MPa/2 h; 3, 45°C/17.2 MPa/2 h; 4, 40°C/17.2 MPa/0.5 h; 5, 40°C/17.2 MPa/1 h; 6, 40°C/13.8 MPa/2 h; 7, 40°C/20.7 MPa/2 h).
Different capital letters on the same row indicate significant differences between storage time for the same treatment (p<0.05).
Different lowercase letters in the same column indicate significant differences between treatments on the same storage time (p<0.05).