Table 3.
Furan levels in instant coffee, coffee mix and liquid coffee (canned coffee, Americano)
| Type | Sample | Furan (ng/g, ng/mL) |
|---|---|---|
| Instant coffee | I_1 | 139.13 ± 6.72b |
| I_2 | 214.61 ± 8.61c,d | |
| I_3 | 1197.96 ± 66.39j | |
| I_4 | 609.56 ± 25.43h | |
| I_5 | 161.21 ± 2.86b,c | |
| I_6 | 405.78 ± 5.26f | |
| I_7 | 1345.70 ± 17.37k | |
| I_8 | 2155.47 ± 42.39m | |
| I_9 | 517.82 ± 22.60g | |
| I_10 | 49.93 ± 0.77a | |
| I_11 | 831.13 ± 60.63i | |
| I_12 | 870.64 ± 54.69i | |
| I_13 | 206.05 ± 5.38c,d | |
| I_14 | 276.31 ± 4.55e | |
| I_15 | 276.20 ± 4.44e | |
| I_16 | 1715.24 ± 53.84l | |
| I_17 | 259.37 ± 6.39d,e | |
| Coffee mix | M_1 | 22.19 ± 0.63a,b |
| M_2 | 81.11 ± 11.19e | |
| M_3 | 161.51 ± 11.27f | |
| M_4 | 42.80 ± 5.97b,c,d | |
| M_5 | 182.57 ± 26.00f,g | |
| M_6 | 63.47 ± 6.68d,e | |
| M_7 | 39.30 ± 1.29b,c | |
| M_8 | 65.50 ± 5.44d,e | |
| M_9 | 60.32 ± 9.64c,d,e | |
| M_10 | 201.91 ± 30.08g | |
| M_11 | 10.87 ± 1.38a | |
| M_12 | 12.83 ± 1.92a | |
| Canned coffee | C_1 | 15.49 ± 2.49a |
| C_2 | 27.34 ± 2.14b | |
| C_3 | 36.64 ± 0.90c | |
| C_4 | 99.35 ± 6.82d | |
| Americano | A_1 | 77.35 ± 3.79a |
| A_2 | 144.59 ± 23.11b | |
| A_3 | 209.09 ± 8.89c | |
| A_4 | 169.27 ± 16.51b |
1. All values are shown as mean ± standard deviation
2. Different letters show significant mean differences between samples by Duncan’s test (p < 0.05)
3. In case of canned and Americano coffee unit of concentration is ng/mL