Table 4.
Amino acids of L. edodes harvested in different culture substrate.
| Amino acids | Control | RS20 | RS40 | RS60 | RS80 |
|---|---|---|---|---|---|
| Aspartic acid | 0.08 ± 0.01 d | 0.10 ± 0.02 d | 0.45 ± 0.07 c | 2.27 ± 0.12 a | 1.69 ± 0.06 b |
| Threonine | 6.09 ± 1.00 b | 7.83 ± 0.83 a | 8.08 ± 0.30 a | 4.82 ± 0.27 c | 5.90 ± 0.18 bc |
| Serine | 0.24 ± 0.03 bc | 0.27 ± 0.02 a | 0.26 ± 0.00 ab | 0.29 ± 0.01 a | 0.23 ± 0.01 c |
| Glutamic acid | 2.00 ± 0.29 d | 2.76 ± 0.29 c | 3.16 ± 0.21 b | 3.90 ± 0.13 a | 3.43 ± 0.09 b |
| Glycine | 0.50 ± 0.06 c | 0.68 ± 0.01 a | 0.68 ± 0.01 a | 0.56 ± 0.02 b | 0.54 ± 0.02 bc |
| Alanine | 2.63 ± 0.38 b | 3.38 ± 0.02 a | 2.60 ± 0.04 b | 0.86 ± 0.03 c | 0.87 ± 0.03 c |
| Cystine | 0.68 ± 0.02 ab | 0.71 ± 0.03 a | 0.63 ± 0.07 b | 0.60 ± 0.02 bc | 0.54 ± 0.04 c |
| Valine | 0.49 ± 0.07 a | 0.55 ± 0.01 a | 0.54 ± 0.01 a | 0.41 ± 0.01 b | 0.38 ± 0.01 b |
| Methionine | 0.07 ± 0.01 a | 0.06 ± 0.01 ab | 0.07 ± 0.01 a | 0.07 ± 0.02 a | 0.05 ± 0.01 b |
| Isoleucine | 0.21 ± 0.03 a | 0.22 ± 0.01 a | 0.20 ± 0.01 a | 0.15 ± 0.01 b | 0.13 ± 0.00 b |
| Leucine | 0.36 ± 0.03 a | 0.35 ± 0.03 a | 0.33 ± 0.01 a | 0.24 ± 0.01 b | 0.23 ± 0.01 b |
| Tyrosine | 0.14 ± 0.04 a | 0.07 ± 0.02 c | 0.08 ± 0.00 bc | 0.10 ± 0.01 abc | 0.11 ± 0.01 ab |
| Phenylalanine | 0.34 ± 0.19 a | 0.30 ± 0.02 a | 0.26 ± 0.01 a | 0.20 ± 0.02 a | 0.21 ± 0.00 a |
| GABA | 0.82 ± 0.19 b | 1.26 ± 0.18 a | 0.68 ± 0.12 b | 0.09 ± 0.01 c | 0.09 ± 0.00 c |
| Ornithine | 3.03 ± 0.54 b | 3.93 ± 0.30 a | 2.82 ± 0.18 b | 1.07 ± 0.04 d | 1.90 ± 0.05 c |
| Lysine | 0.31 ± 0.04 a | 0.28 ± 0.01 a | 0.30 ± 0.01 a | 0.21 ± 0.01 b | 0.21 ± 0.01 b |
| Proline | 0.19 ± 0.01 a | 0.18 ± 0.01 a | 0.17 ± 0.01 a | not detected | not detected |
| Histidine | 0.36 ± 0.06 a | 0.39 ± 0.01 a | 0.35 ± 0.01 a | 0.24 ± 0.01 b | 0.28 ± 0.01 b |
| Arginine | 0.88 ± 0.11 b | 1.24 ± 0.03 a | 0.76 ± 0.03 c | 0.21 ± 0.02 e | 0.34 ± 0.00 d |
| Essential AA | 7.88 ± 1.04 b | 9.59 ± 0.78 a | 9.79 ± 0.32 a | 6.10 ± 0.31 c | 7.11 ± 0.21 bc |
| Total AA | 19.43 ± 2.52 b | 24.59 ± 0.63 a | 22.44 ± 0.29 a | 16.29 ± 0.69 c | 17.14 ± 0.52 c |
| MSG-like | 2.09 ± 0.30 e | 2.87 ± 0.32 d | 3.62 ± 0.28 c | 6.17 ± 0.24 a | 5.12 ± 0.15 b |
| Sweet | 9.64 ± 1.40 b | 12.36 ± 0.83 a | 11.80 ± 0.26 a | 6.53 ± 0.33 c | 7.54 ± 0.23 c |
| Bitter | 2.72 ± 0.38 b | 3.12 ± 0.06 a | 2.52 ± 0.05 b | 1.52 ± 0.08 c | 1.62 ± 0.04 c |
| Tasteless | 1.95 ± 0.19 b | 2.32 ± 0.18 a | 1.69 ± 0.15 c | 1.00 ± 0.03 d | 0.95 ± 0.05 d |
Values (mg/g dry weight) are the means ± SD (n = 3). Means with different letters with a row are significantly different (P < 0.05).
GABA, γ-aminobutyric acid. Essential amino acids, Thr + Val + Met + Ile + Leu + Phe + Lys + Trp, while Trp was not detected in this study. MSG-like, monosodium glutamate-like, Asp + Glu; Tasteless, Cys + Tyr + Lys + GABA; Sweet, Thr + Ser + Gly + Ala + Pro; Bitter, Val + Met + Ile + Leu + Phe + His + Arg + Trp.