Table 1.
The content of free amino acids (FAAs), 5′-nucleotides, and organic acids of Crassostrea gigas depurated at different salinities.
| Content (FAAs, flavor nucleotides, organic acid mg/100 g, mean ± SD) |
|||||||
|---|---|---|---|---|---|---|---|
| Pro-depuration | S26 | S29 | S32 | S35 | S38 | ||
| FAAs | Asp | 71.98 ± 4.26a | 67.82 ± 4.05ab | 68.65 ± 5.49ab | 63.20 ± 8.37b | 63.96 ± 3.53b | 45.57 ± 4.01c |
| Glu | 113.67 ± 7.09a | 110.02 ± 8.19a | 111.17 ± 2.39a | 101.44 ± 8.02b | 100.43 ± 7.28b | 92.04 ± 6.09c | |
| UFAAs | 185.57 ± 6.35a | 177.84 ± 9.24b | 179.82 ± 8.51ab | 164.64 ± 9.39c | 164.39 ± 8.81c | 137.61 ± 7.10e | |
| Thr | 18.46 ± 1.57 | 17.12 ± 1.01 | 18.56 ± 1.08 | 19.57 ± 2.82 | 19.86 ± 7.63 | 20.71 ± 1.34 | |
| Ser | 29.55 ± 4.72 cd | 32.27 ± 2.25bc | 40.59 ± 3.15a | 34.56 ± 3.41b | 28.08 ± 2.88 cd | 25.86 ± 1.66d | |
| Gly | 102.46 ± 7.73a | 47.22 ± 3.21c | 75.08 ± 4.82b | 91.45 ± 3.77ab | 100.53 ± 9.13a | 101.21 ± 8.99a | |
| Ala | 83.81 ± 6.54c | 68.08 ± 5.69c | 86.12 ± 3.04c | 107.98 ± 8.90b | 133.12 ± 8.66a | 148.94 ± 5.51a | |
| Arg | 81.20 ± 7.55 | 77.11 ± 6.12 | 71.07 ± 5.74 | 73.08 ± 7.41 | 74.21 ± 6.72 | 68.84 ± 5.49 | |
| Pro | 122.72 ± 9.13b | 104.13 ± 8.13c | 110.38 ± 8.66bc | 122.93 ± 5.26b | 110.43 ± 7.94bc | 149.81 ± 6.75a | |
| SFAAs | 438.23 ± 19.16b | 345.93 ± 21.41d | 401.83 ± 24.49bc | 449.57 ± 27.57b | 466.21 ± 39.96b | 515.36 ± 43.74a | |
| Val | 11.40 ± 0.82ab | 9.12 ± 0.77b | 10.34 ± 0.53b | 13.26 ± 1.22a | 10.91 ± 2.26b | 11.17 ± 1.00ab | |
| Met | 13.36 ± 1.44ab | 9.99 ± 1.93c | 10.75 ± 0.41bc | 12.99 ± 1.25ab | 14.04 ± 3.98ab | 15.79 ± 0.86a | |
| Ile | 12.86 ± 1.04 | 11.04 ± 1.14 | 11.38 ± 0.82 | 13.82 ± 0.92 | 12.41 ± 1.18 | 12.83 ± 1.11 | |
| Leu | 17.24 ± 1.87 | 13.58 ± 1.24 | 14.17 ± 0.79 | 18.06 ± 1.48 | 15.55 ± 1.31 | 16.11 ± 1.22 | |
| Tyr | 17.62 ± 1.62a | 11.81 ± 1.57b | 14.90 ± 0.74ab | 17.79 ± 1.03a | 16.26 ± 1.20ab | 16.86 ± 0.97a | |
| Phe | 10.21 ± 1.63ab | 7.04 ± 0.46b | 7.31 ± 0.88ab | 10.97 ± 1.33a | 9.57 ± 0.50ab | 10.62 ± 0.86ab | |
| Lys | 17.78 ± 1.22 | 17.49 ± 1.14 | 18.73 ± 1.52 | 23.42 ± 0.93 | 23.58 ± 1.52 | 19.89 ± 1.35 | |
| His | 14.26 ± 1.33ab | 11.64 ± 1.33b | 12.22 ± 0.37b | 16.47 ± 1.02a | 17.65 ± 1.12a | 17.00 ± 1.34a | |
| BFAAs | 114.73 ± 10.57ab | 91.71 ± 8.78b | 99.80 ± 5.26b | 126.78 ± 12.25a | 119.97 ± 12.67ab | 120.27 ± 7.71ab | |
| TFAAs | 738.53 ± 51.69ab | 615.48 ± 42.45c | 681.45 ± 40.06b | 740.99 ± 49.96ab | 750.57 ± 50.99ab | 773.24 ± 62.74a | |
| Organic acids | Succinic acid | 23.66 ± 2.05a | 19.35 ± 1.68ab | 24.77 ± 1.95a | 16.60 ± 1.13b | 24.11 ± 1.51a | 17.78 ± 1.92b |
| Lactic acid | 0.27 ± 0.01ab | 0.28 ± 0.01ab | 0.26 ± 0.02ab | 0.24 ± 0.02b | 0.26 ± 0.01ab | 0.31 ± 0.03a | |
| Nucleotides | Hx | 19.68 ± 1.58a | 14.64 ± 0.91c | 14.79 ± 0.37c | 14.78 ± 0.02c | 13.77 ± 0.26c | 17.15 ± 0.81b |
| AMP | 25.20 ± 2.76bc | 22.59 ± 0.70c | 45.81 ± 3.96a | 45.91 ± 3.31a | 47.19 ± 0.99a | 43.18 ± 0.75a | |
| IMP | 3.54 ± 0.72c | 2.51 ± 0.19d | 5.59 ± 0.06b | 4.79 ± 0.13bc | 6.32 ± 0.12a | 5.79 ± 0.27b | |
| GMP | 10.23 ± 1.10b | 11.04 ± 0.29b | 13.01 ± 1.59a | 12.49 ± 1.92ab | 12.01 ± 1.37ab | 13.38 ± 1.23a | |
| EUC (g MSG/100 g) | 4.50 ± 0.38c | 4.60 ± 0.32c | 6.22 ± 0.71a | 5.38 ± 0.17b | 5.64 ± 0.32b | 5.01 ± 0.56b | |
Means with different letters within a column are significantly different (P < 0.05). Asp, aspartic acid; Glu, glutamic acid; Thr, threonine; Ser, serine; Gly, glycine; Ala, alanine; Arg, arginine; Pro, proline; Cys, cysteine; Val, valine; Met, methionine; Ile, isoleucine; Leu, leucine; Tyr, tyrosine; Phe, phenylalanine; Lys, lysine; His, histidine; TFAAs, total FAAs; UFAAs, total Asp and Glu; SFAAs, total Thr, Ser, Gly, Ala, Arg, and Pro; BFAAs, total Val, Met, Ile, Leu, Phe, Tyr, Lys, and His. Hx, hypoxanthine; AMP, adenosine monophosphate; IMP, inosine monophosphate; GMP, guanosine monophosphate.