Table 3. Effects of different treatments on the color values of ground pork during 9 days of refrigerated storage

Color value	Treatment	Storage time (days)
Color value	Treatment	1	3	5	7	9
CIE L*	UT	43.26±0.92^Be	44.13±1.05^ABd	45.04±1.04^Ad	44.51±1.21^ABd	45.59±0.58^Ad
	HT	45.79±0.17^Ad	45.41±0.02^Ad	45.67±2.79^Ad	44.01±1.43^Ad	46.08±1.69^Ad
	SCT 1	53.73±1.88^Aa	53.90±0.99^Aa	53.78±0.82^Ab	51.85±1.55^Abc	51.35±2.54^Abc
	SCT 2	54.51±1.16^Aa	54.65±1.90^Aa	52.68±2.17^Ab	51.95±3.51^Abc	51.81±2.41^Abc
	SCT 3	55.80±1.1^Aa	55.54±1.65^Aa	56.70±1.59^Aa	55.60±0.29^Aa	55.71±0.75^Aa
	SCT 4	48.34±0.99^ABc	49.45±0.36^ABc	47.43±1.38^Bd	50.02±2.73^Ac	49.70±1.07^ABc
	SCT 5	51.46±2.37^Ab	51.61±0.33^Ab	50.06±1.83^Ac	51.85±1.34^Abc	49.79±2.09^Abc
	SCT 6	55.39±1.91^Aa	55.8±1.04^Aa	53.62±0.61^ABb	51.86±2.00^Bbc	52.52±1.01^Bb
	SCT 7	54.74±0.40^Aa	54.37±1.29^Aa	53.44±0.26^Ab	53.8±0.53^Aab	50.98±1.17^Bbc
CIE a*	UT	10.79±1.32^Aa	9.85±0.84^Aab	10.55±0.88^Aa	7.28±0.66^Bb	6.60±0.34^Bab
	HT	7.83±1.21^Bc	6.50±0.10^Cc	8.76±1.47^Abcd	8.83±0.90^Aa	6.78±0.08^Cab
	SCT 1	8.67±0.45^Abc	8.84±1.23^Ab	9.62±0.74^Aabc	5.93±0.72^Bc	5.34±1.06^Bc
	SCT 2	8.97±0.77^Abc	9.43±0.67^Ab	8.00±0.70^Bcd	5.87±0.36^Bc	5.49±0.32^Cc
	SCT 3	9.62±0.35^Aab	8.67±1.39^Ab	8.89±0.85^Aabcd	7.41±0.27^Bb	7.15±0.18^Bab
	SCT 4	9.43±0.43^ABb	8.58±0.15^Bb	9.94±0.41^Aab	6.98±1.55^Cbc	7.22±0.18^Ca
	SCT 5	9.44±0.33^Ab	9.59±1.11^Aab	8.61±2.45^ABbcd	7.00±1.43^Bbc	6.85±0.17^Bab
	SCT 6	9.26±0.61^Ab	9.49±0.22^Aab	7.18±0.25^Bd	5.65±0.66^Cc	5.58±1.13^Cc
	SCT 7	8.59±0.85^Bbc	10.78±0.62^Aa	7.15±0.32^Cd	6.16±0.41^Dbc	6.22±0.49^Dc
CIE b*	UT	6.83±0.87^Ac	4.43±0.26^Bf	3.70±0.49^BCe	2.96±0.44^Cb	2.97±0.37^Cd
	HT	8.07±0.70^Abc	8.39±0.04^Acd	3.40±0.55^Be	2.27±0.64^Cb	2.43±0.57^Cd
	SCT 1	9.09±0.71^Aab	9.16±1.53^Aabc	7.02±0.74^Bb	5.57±0.45^Ca	6.50±0.29^BCbc
	SCT 2	9.41±1.11^Aab	10.33±0.22^Aa	6.10±0.77^Bcd	6.40±0.77^Ba	6.33±1.38^Bb
	SCT 3	10.20±0.71^Aa	9.56±0.41^Aabc	8.31±0.63^Ba	6.08±0.41^Ca	6.51±1.11^Cb
	SCT 4	8.10±0.99^Abc	6.71±0.86^Be	4.20±0.22^Ce	4.86±0.35^Cb	4.46±0.47^Cc
	SCT 5	9.43±0.68^Aab	7.61±0.97^Bde	5.53±0.43^Cd	5.68±1.64^Cab	4.65±1.29^Cbc
	SCT 6	9.82±0.72^Aa	9.93±0.82^Aab	7.22±1.13^Bb	7.97±0.61^Ba	7.17±0.89^Ba
	SCT 7	9.70±0.92^Aa	8.72±1.04^Bbcd	6.69±0.20^CDbc	7.55±0.28^Ca	6.40±0.26^Da

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).