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Table 3 Free amino acid profile of the leg muscle during 7-week storage at −20 °C

From: Postmortem changes in physiochemical and sensory properties of red snow crab (Chionoecetes japonicus) leg muscle during freeze storage

Amino acid Storage period (week)
0 1 3 5 7
Nutritionally non-essential amino acid (mg 100 g−1, wet base)
 Alanine 270.9 264.5 278.4 264.3 176.0
 Aspartic acid 1.2 3.9 4.8 4.2 5.3
 Glutamic acid 26.0 21.2 10.7 26.9 26.6
 Glycine 657.0 582.8 562.8 450.1 359.3
 Tyrosine 59.1 20.9 31.7 19.5 20.0
 Sum 1014.2 893.3 888.4 765.0 567.2
Nutritionally essential amino acid (mg 100 g−1, wet base)
 Threonine 1.3 7.0 18.3 5.1 21.5
 Valine 58.1 46.2 59.4 56.2 53.2
 Methionine 60.5 33.4 43.1 59.6 47.9
 Isoleucine 53.3 37.3 36.8 50.6 39.1
 Leucine 68.9 52.3 44.4 65.4 72.8
 Phenylalanine 61.8 39.1 51.0 42.0 36.6
 Lysine 91.7 83.0 93.2 121.1 71.7
 Arginine 672.6 609.3 293.3 387.2 231.2
 Sum 1068.2 907.6 639.5 787.2 573.7
Other amino acid (mg 100 g−1, wet base)
 Phosphoserine 3.8 8.8 4.5 6.8 5.3
 Taurine 210.0 172.7 192.9 182.6 135.0
 Sarcosine 75.1 58.7 68.7 47.2 53.8
 Ammonia 19.7 12.2 7.6 9.8 12.7
 Sum 308.6 252.4 273.7 246.4 206.8
Total 2391.0 2053.3 1801.6 1798.6 1347.7