Table 8. Change of essential amino acid contents (%) of frozen duck breast meat by thawing methods and storage periods
Treatments1 | Methionine | Threonine | Valine | Iso-leucine | Leucine | Phenylalanine | Lysine | Histidine | Arginine | EAA |
1-S | 0.51±0.013 | 0.96±0.01ab | 0.91±0.01cd | 0.83±0.01ab | 1.74±0.01a | 0.80±0.01bcd | 1.77±0.01a | 0.59±0.01ab | 1.31±0.02a | 9.43±0.06a |
1-F | 0.52±0.01 | 0.98±0.01a | 0.93±0.01bc | 0.85±0.01a | 1.76±0.02a | 0.82±0.01abc | 1.81±0.02a | 0.61±0.01a | 1.32±0.01a | 9.60±0.11a |
3-S | 0.52±0.01 | 0.98±0.02a | 0.90±0.01cd | 0.85±0.02a | 1.75±0.04a | 0.84±0.02a | 1.81±0.04a | 0.61±0.01a | 1.35±0.03a | 9.61±0.21a |
3-F | 0.50±0.01 | 0.96±0.01ab | 0.88±0.01de | 0.85±0.01a | 1.72±0.02ab | 0.83±0.01ab | 1.77±0.02a | 0.58±0.01ab | 1.32±0.02a | 9.40±0.08a |
6-S | 0.50±0.01 | 0.93±0.01bc | 0.85±0.01e | 0.80±0.01bcd | 1.65±0.01bc | 0.80±0.01bcd | 1.65±0.01b | 0.54±0.01cd | 1.20±0.01b | 8.92±0.04b |
6-F | 0.51±0.01 | 0.90±0.02c | 0.82±0.01f | 0.77±0.01d | 1.59±0.03c | 0.78±0.01d | 1.60±0.04b | 0.51±0.02d | 1.18±0.03b | 8.67±0.18b |
12-S | 0.50±0.01 | 0.90±0.01c | 0.95±0.02b | 0.79±0.01cd | 1.69±0.03ab | 0.79±0.01cd | 1.66±0.03b | 0.52±0.01cd | 1.20±0.03b | 9.01±0.14b |
12-F | 0.51±0.01 | 0.95±0.01ab | 0.99±0.01a | 0.83±0.01abc | 1.76±0.01a | 0.82±0.01ab | 1.73±0.01a | 0.56±0.01bc | 1.24±0.01b | 9.38±0.03a |
Storage period | | | | | | | | | |
1 | 0.52±0.014 | 0.97±0.01a | 0.92±0.01b | 0.84±0.01a | 1.75±0.01a | 0.81±0.01b | 1.79±0.01a | 0.60±0.01a | 1.32±0.01a | 9.52±0.07a |
3 | 0.51±0.01 | 0.97±0.01a | 0.89±0.01c | 0.85±0.01a | 1.73±0.02a | 0.83±0.01a | 1.79±0.02a | 0.59±0.01a | 1.34±0.02a | 9.50±0.11a |
6 | 0.51±0.01 | 0.91±0.01b | 0.84±0.01d | 0.78±0.01c | 1.62±0.02b | 0.79±0.01b | 1.63±0.02c | 0.53±0.01b | 1.19±0.01b | 8.80±0.11c |
12 | 0.50±0.01 | 0.93±0.01b | 0.97±0.01a | 0.81±0.01b | 1.72±0.02a | 0.81±0.01b | 1.70±0.02b | 0.54±0.01b | 1.22±0.02b | 9.20±0.11b |
Thawing | | | | | | | | | | |
Slow | 0.51±0.015 | 0.94±0.01 | 0.90±0.01 | 0.82±0.01 | 1.70±0.02 | 0.81±0.01 | 1.72±0.01 | 0.57±0.01 | 1.27±0.02 | 9.24±0.11 |
Fast | 0.51±0.01 | 0.95±0.01 | 0.91±0.02 | 0.82±0.01 | 1.71±0.02 | 0.81±0.01 | 1.73±0.03 | 0.56±0.01 | 1.27±0.02 | 9.26±0.12 |
P-value2 | | | | | | | | | | |
P × T | NS | ** | ** | ** | ** | ** | ** | ** | ** | ** |
Period | NS | ** | ** | ** | ** | ** | ** | ** | ** | ** |
Thawing | NS | NS | NS | NS | NS | NS | NS | NS | NS | NS |
SD, standard deviation.
1, 3, 6, 12 (mon), storage periods in deep freezer; S (slow), F (fast), thawing methods.
Probability of contrast, NS, No significance, * P<0.05, ** P<0.01.
Values are means±SD of 3 repetitions (3 samples per repetition).
Values are means±SD of 6 repetitions (3 samples per repetition).
Values are means±SD of 12 repetitions (3 samples per repetition).