Table 3.
Contents* of free amino acids in different types of tea.
| Compound | Congou black tea | Yellow mountain fuzz tip | Rizhao green tea | Green tea 1 | Green tea 2 | Maojian tea | Yacca tea | Taiping houkui tea | Sword shaped green tea |
|---|---|---|---|---|---|---|---|---|---|
| L-Arginine | 0.203 ± 0.002 | 1.213 ± 0.039 | 0.482 ± 0.009 | 1.339 ± 0.034 | 1.466 ± 0.035 | 0.704 ± 0.020 | 0.875 ± 0.028 | 0.908 ± 0.009 | 1.091 ± 0.010 |
| L-Aspartic acid | 0.812 ± 0.018 | 2.373 ± 0.001 | 2.380 ± 0.012 | 2.302 ± 0.026 | 2.565 ± 0.009 | 2.435 ± 0.005 | 1.951 ± 0.025 | 2.218 ± 0.001 | 3.343 ± 0.037 |
| L-Cysteine | ND | ND | ND | ND | ND | ND | ND | ND | ND |
| L-Cystine | ND | ND | ND | ND | ND | ND | ND | ND | ND |
| L-Glutamic acid | 0.507 ± 0.003 | 2.592 ± 0.002 | 1.712 ± 0.016 | 2.953 ± 0.000 | 2.492 ± 0.033 | 2.003 ± 0.005 | 4.170 ± 0.018 | 3.024 ± 0.014 | 2.948 ± 0.025 |
| Glycine | ND | ND | ND | ND | ND | ND | ND | ND | ND |
| L-Histidine | 0.036 ± 0.002 | 0.149 ± 0.006 | 0.146 ± 0.003 | 0.092 ± 0.003 | 0.209 ± 0.001 | 0.143 ± 0.000 | 0.449 ± 0.010 | 0.120 ± 0.004 | 0.376 ± 0.006 |
| L-Isoleucine | 0.180 ± 0.011 | 0.284 ± 0.008 | 0.369 ± 0.007 | 0.326 ± 0.009 | 0.577 ± 0.007 | 0.427 ± 0.004 | 0.770 ± 0.002 | 0.217 ± 0.004 | 0.735 ± 0.006 |
| L-Leucine | 0.232 ± 0.011 | 0.363 ± 0.007 | 0.343 ± 0.014 | 0.324 ± 0.007 | 0.486 ± 0.006 | 0.333 ± 0.005 | 0.581 ± 0.005 | 0.323 ± 0.006 | 0.649 ± 0.003 |
| L-Lysine | 0.126 ± 0.001 | 0.240 ± 0.002 | 0.334 ± 0.006 | 0.341 ± 0.009 | 0.528 ± 0.001 | 0.361 ± 0.004 | 0.786 ± 0.009 | 0.228 ± 0.006 | 0.766 ± 0.013 |
| L-Methionine | 0.038 ± 0.005 | 0.036 ± 0.001 | 0.022 ± 0.001 | 0.022 ± 0.000 | 0.031 ± 0.001 | 0.021 ± 0.001 | 0.039 ± 0.001 | 0.037 ± 0.001 | 0.033 ± 0.000 |
| L-Phenylalanine | 0.290 ± 0.002 | 0.523 ± 0.005 | 0.557 ± 0.116 | 0.336 ± 0.015 | 0.410 ± 0.010 | 0.640 ± 0.006 | 0.610 ± 0.024 | 0.379 ± 0.009 | 0.437 ± 0.003 |
| L-Proline | 0.051 ± 0.000 | 0.029 ± 0.001 | 0.085 ± 0.001 | 0.059 ± 0.001 | 0.114 ± 0.002 | 0.079 ± 0.001 | 0.173 ± 0.000 | 0.037 ± 0.001 | 0.183 ± 0.002 |
| L-Serine | 0.305 ± 0.013 | 0.332 ± 0.007 | 0.539 ± 0.006 | 0.578 ± 0.008 | 0.684 ± 0.007 | 0.486 ± 0.004 | 0.746 ± 0.011 | 0.411 ± 0.004 | 0.784 ± 0.008 |
| L-Threonine | 0.164 ± 0.004 | 0.566 ± 0.002 | 0.610 ± 0.002 | 0.508 ± 0.000 | 0.740 ± 0.012 | 0.578 ± 0.004 | 0.965 ± 0.002 | 0.536 ± 0.001 | 0.951 ± 0.007 |
| L-Tyrosine | 0.051 ± 0.003 | 0.145 ± 0.002 | 0.074 ± 0.031 | 0.133 ± 0.003 | 0.185 ± 0.003 | 0.151 ± 0.003 | 0.279 ± 0.003 | 0.127 ± 0.001 | 0.165 ± 0.058 |
| L-Valine | 3.495 ± 0.013 | 3.182 ± 0.047 | 5.153 ± 0.013 | 3.235 ± 0.035 | 3.216 ± 0.001 | 5.009 ± 0.031 | 5.848 ± 0.038 | 2.233 ± 0.042 | 7.403 ± 0.078 |
| L-Alanine | 0.217 ± 0.005 | 0.150 ± 0.000 | 0.111 ± 0.001 | 0.190 ± 0.003 | 0.194 ± 0.002 | 0.183 ± 0.003 | 0.212 ± 0.007 | 0.163 ± 0.010 | 0.181 ± 0.005 |
| Theanine | 2.787 ± 0.009 | 11.638 ± 0.198 | 5.330 ± 0.020 | 5.775 ± 0.170 | 5.843 ± 0.023 | 4.499 ± 0.024 | 5.745 ± 0.040 | 9.073 ± 0.008 | 3.844 ± 0.010 |
| L-Tryptophan | 0.102 ± 0.001 | 0.258 ± 0.005 | 0.188 ± 0.001 | 0.160 ± 0.001 | 0.131 ± 0.042 | 0.236 ± 0.003 | 0.202 ± 0.006 | 0.206 ± 0.009 | 0.195 ± 0.001 |
| L-Asparagine | 0.254 ± 0.001 | 0.629 ± 0.001 | 1.354 ± 0.004 | 0.607 ± 0.005 | 1.303 ± 0.001 | 1.154 ± 0.028 | 3.248 ± 0.025 | 0.401 ± 0.007 | 1.987 ± 0.001 |
| L-Glutamine | 0.311 ± 0.002 | 5.773 ± 0.098 | 0.793 ± 0.014 | 1.637 ± 0.003 | 2.647 ± 0.005 | 1.949 ± 0.002 | 2.265 ± 0.040 | 5.168 ± 0.028 | 1.931 ± 0.005 |
| Aminoadipic acid | ND | ND | ND | ND | ND | ND | ND | ND | ND |
| α-Aminobutyric acid | ND | ND | ND | ND | ND | ND | ND | ND | ND |
| β-Aminobutyric acid | ND | ND | ND | ND | ND | ND | ND | ND | ND |
| γ-Aminobutyric acid | 0.059 ± 0.005 | 0.119 ± 0.004 | 0.017 ± 0.002 | 0.072 ± 0.003 | 0.073 ± 0.005 | 0.052 ± 0.003 | 0.051 ± 0.004 | 0.052 ± 0.005 | 0.045 ± 0.003 |
| Citrulline | 0.004 ± 0.000 | 0.029 ± 0.000 | 0.015 ± 0.000 | 0.023 ± 0.001 | 0.041 ± 0.000 | 0.011 ± 0.001 | 0.012 ± 0.000 | 0.026 ± 0.001 | 0.036 ± 0.001 |
| Hydroxyproline | 0.017 ± 0.000 | 0.020 ± 0.000 | 0.024 ± 0.000 | 0.029 ± 0.000 | 0.020 ± 0.000 | 0.021 ± 0.000 | 0.019 ± 0.000 | 0.022 ± 0.000 | 0.020 ± 0.000 |
| Hydroxylysine | ND | ND | ND | ND | ND | ND | ND | ND | ND |
| 1-Methyl-L-histidine | 0.013 ± 0.000 | 0.015 ± 0.000 | 0.016 ± 0.000 | 0.014 ± 0.000 | 0.017 ± 0.000 | 0.015 ± 0.000 | 0.018 ± 0.000 | 0.016 ± 0.000 | 0.021 ± 0.000 |
| 3-Methyl-L-histidine | ND | 0.009 ± 0.000 | 0.011 ± 0.000 | 0.010 ± 0.001 | 0.012 ± 0.000 | 0.009 ± 0.000 | 0.016 ± 0.000 | 0.010 ± 0.001 | 0.031 ± 0.001 |
| L-Ornithine | ND | ND | ND | ND | ND | ND | ND | ND | ND |
| Sarcosine | ND | 0.018 ± 0.000 | ND | ND | ND | ND | ND | ND | ND |
| DL-Homocysteine | ND | ND | ND | ND | ND | ND | ND | ND | ND |
| L-Pipecolic acid | 0.045 ± 0.001 | 0.083 ± 0.001 | 0.117 ± 0.003 | 0.117 ± 0.001 | 0.182 ± 0.002 | 0.133 ± 0.003 | 0.281 ± 0.001 | 0.081 ± 0.003 | 0.269 ± 0.007 |
| Total | 10.299 ± 0.041 | 30.765 ± 0.371 | 20.782 ± 0.106 | 21.181 ± 0.307 | 24.163 ± 0.160 | 21.631 ± 0.092 | 30.311 ± 0.119 | 26.018 ± 0.105 | 28.422 ± 0.187 |
*
Value (mg/g) = mean ± SD (n = 3). ND, not detectable.