Table 2.
Theanine, melatonin, and serotonin content in Arabica and Robusta coffee brews (µg g−1).
| Coffee 1 | Unroasted–Green (G) /Roasting Degree (R1–R3; Light, Medium, Dark) |
Theanine | Melatonin | Serotonin |
|---|---|---|---|---|
| Coffea arabica | ||||
| ABM | G | 5.27 ± 0.21 | 0.0006 ± 0.0001 | 15.48 ± 0.13 |
| R1 | 0.09 ± 0.01 | 0.0030 ± 0.0003 | 0.13 ± 0.02 | |
| R2 | 0.16 ± 0.02 | 0.0051 ± 0.0004 | 0.05 ± 0.01 | |
| R3 | 0.12 ± 0.02 | 0.0027 ± 0.0002 | 0.09 ± 0.02 | |
| ABMT | G | 3.64 ± 0.09 | 0.0009 ± 0.0001 | 9.96 ± 0.11 |
| R1 | 0.06 ± 0.01 | 0.0036 ± 0.0003 | 0.13 ± 0.03 | |
| R2 | 0.08 ± 0.01 | 0.0038 ± 0.0003 | 0.03 ± 0.01 | |
| R3 | 0.15 ± 0.02 | 0.0072 ± 0.0005 | 0.09 ± 0.01 | |
| AC | G | 3.57 ± 0.09 | 0.0014 ± 0.0001 | 20.67 ± 1.01 |
| R1 | 0.05 ± 0.01 | 0.0028 ± 0.0003 | 0.20 ± 0.02 | |
| R2 | 0.03 ± 0.01 | 0.0019 ± 0.0002 | 0.11 ± 0.01 | |
| R3 | 0.29 ± 0.03 | 0.0022 ± 0.0002 | 0.10 ± 0.01 | |
| AG | G | 3.87 ± 0.09 | 0.0006 ± 0.0001 | 22.41 ± 1.21 |
| R1 | 0.09 ± 0.01 | 0.0015 ± 0.0002 | 0.25 ± 0.03 | |
| R2 | 0.03 ± 0.01 | 0.0064 ± 0.0005 | 0.16 ± 0.02 | |
| R3 | 0.11 ± 0.01 | 0.0053 ± 0.0005 | 0.10 ± 0.01 | |
| AP | G | 4.68 ± 0.12 | 0.0009 ± 0.0001 | 33.26 ± 1.13 |
| R1 | 0.04 ± 0.01 | 0.0019 ± 0.0002 | 0.23 ± 0.02 | |
| R2 | 0.06 ± 0.01 | 0.0019 ± 0.0002 | 0.13 ± 0.01 | |
| R3 | 0.10 ± 0.01 | 0.0023 ± 0.0002 | 0.10 ± 0.01 | |
| AUB | G | 2.08 ± 0.08 | 0.0016 ± 0.0002 | 13.67 ± 0.74 |
| R1 | 0.04 ± 0.01 | 0.0018 ± 0.0002 | 0.16 ± 0.01 | |
| R2 | 0.03 ± 0.01 | 0.0014 ± 0.0001 | 0.10 ± 0.01 | |
| R3 | 0.03 ± 0.01 | 0.0020 ± 0.0002 | 0.11 ± 0.01 | |
| AUD | G | 6.34 ± 0.13 | 0.0024 ± 0.0002 | 31.15 ± 1.23 |
| R1 | 0.06 ± 0.01 | 0.0034 ± 0.0002 | 0.15 ± 0.03 | |
| R2 | 0.11 ± 0.01 | 0.0018 ± 0.0001 | 0.13 ± 0.01 | |
| R3 | 0.18 ± 0.02 | 0.0016 ± 0.0001 | 0.09 ± 0.01 | |
| AL | R2 | 0.06 ± 0.01 | 0.0038 ± 0.0002 | 0.06 ± 0.01 |
| Coffea robusta | ||||
| RBC1 | G | 6.60 ± 0.17 | 0.0014 ± 0.0002 | 16.22 ± 0.97 |
| R1 | 0.15 ± 0.01 | 0.0038 ± 0.0003 | 0.13 ± 0.01 | |
| R2 | 0.13 ± 0.01 | 0.0120 ± 0.0009 | 0.07 ± 0.01 | |
| R3 | 0.18 ± 0.02 | 0.0039 ± 0.0002 | 0.07 ± 0.01 | |
| RBC2 | G | 8.73 ± 0.41 | 0.0039 ± 0.0002 | 28.11 ± 1.21 |
| R1 | 0.09 ± 0.01 | 0.0040 ± 0.0002 | 0.11 ± 0.01 | |
| R2 | 0.40 ± 0.08 | 0.0044 ± 0.0003 | 0.12 ± 0.01 | |
| R3 | 0.08 ± 0.01 | 0.0026 ± 0.0002 | 0.10 ± 0.01 | |
| RT | G | 2.75± 0.11 | 0.0072 ± 0.0003 | 18.52 ± 0.87 |
| R1 | 0.20 ± 0.01 | 0.0025 ± 0.0002 | 0.21 ± 0.02 | |
| R2 | 0.12 ± 0.01 | 0.0039 ± 0.0002 | 0.13 ± 0.01 | |
| R3 | 0.11 ± 0.01 | 0.0052 ± 0.0003 | 0.11 ± 0.01 | |
| RU | G | 7.39 ± 0.18 | 0.0053 ± 0.0002 | 19.52 ± 0.99 |
| R1 | 0.11 ± 0.01 | 0.0084 ± 0.0004 | 0.22 ± 0.01 | |
| R2 | 0.08 ± 0.01 | 0.0060 ± 0.0003 | 0.16 ± 0.02 | |
| R3 | 0.63 ± 0.06 | 0.0035 ± 0.0002 | 0.11 ± 0.01 | |
| RUBB | G | 10.11 ± 0.19 | 0.0043 ± 0.0002 | 16.00 ± 0.87 |
| R1 | 0.91 ± 0.02 | 0.0036 ± 0.0002 | 0.08 ± 0.01 | |
| R2 | 0.14 ± 0.01 | 0.0017 ± 0.0002 | 0.10 ± 0.02 | |
| R3 | 1.34 ± 0.01 | 0.0039 ± 0.0002 | 0.09 ± 0.02 | |
| RV | G | 9.61 ± 0.21 | 0.0051 ± 0.0003 | 19.33 ± 0.98 |
| R1 | 0.65 ± 0.03 | 0.0092 ± 0.0004 | 0.09 ± 0.01 | |
| R2 | 0.39 ± 0.03 | 0.0021 ± 0.0002 | 0.23 ± 0.01 | |
| R3 | 0.19 ± 0.02 | 0.0065 ± 0.0004 | 0.12 ± 0.01 | |
| RVD | G | 7.79 ± 0.20 | 0.0025 ± 0.0002 | 0.90 ± 0.08 |
| R1 | 0.26 ± 0.03 | 0.0044 ± 0.0003 | 0.04 ± 0.01 | |
| R2 | 0.16 ± 0.02 | 0.0031± 0.0002 | 0.04 ± 0.01 | |
| R3 | 0.15 ± 0.02 | 0.0024 ± 0.0002 | 0.04 ± 0.01 | |
| RVBB | G | 8.63 ± 0.24 | 0.0061 ± 0.0005 | 19.67 ± 1.12 |
| R1 | 0.12 ± 0.02 | 0.0028 ± 0.0002 | 0.25 ± 0.03 | |
| R2 | 0.08 ± 0.01 | 0.0054 ± 0.0004 | 0.22 ± 0.03 | |
| R3 | 0.40 ± 0.01 | 0.0038 ± 0.0003 | 0.17 ± 0.02 | |
| RVBBS | G | 0.27 ± 0.03 | 0.0018 ± 0.0002 | 0.20 ± 0.02 |
| R1 | 0.10 ± 0.01 | 0.0015 ± 0.0002 | 0.05 ± 0.01 | |
| R2 | 0.14 ± 0.01 | 0.0035 ± 0.0003 | 0.08 ± 0.01 | |
| R3 | 0.19 ± 0.02 | 0.0024 ± 0.0002 | 0.05 ± 0.01 | |
1 Abbreviations and information about the coffee was provided in Table 1.