Table 3.
CGAs and caffeine contents of ready-to-drink coffees*.
| No | Sample | 3-CQA | 5-CQA | 4-CQA | 3,4-diCQA | 3.5-diCQA | 4,5-diCQA | 3-FQA | Total CGAs | Caffeine | Caffeine/CGAs |
|---|---|---|---|---|---|---|---|---|---|---|---|
| (mg/L) | (mg/L) | (mg/L) | (mg/L) | (mg/L) | (mg/L) | (mg/L) | (mg/serving) | (mg/serving) | ratio | ||
| 20 | NM 1 | 173.2 | 160.4 | 138.8 | 10.9 | 7.3 | 6.9 | 36.0 | 146.7 | 95.1 | 0.6 |
| 21 | NM 2 | 124.6 | 124.6 | 105.7 | 4.0 | 2.9 | 2.6 | 22.9 | 106.5 | 82.4 | 0.8 |
| 22 | NM 3 | 66.3 | 55.8 | 49.3 | 2.6 | 2.1 | 2.0 | 22.6 | 55.2 | 123.9 | 2.2 |
| 23 | NM 4 | 54.2 | 65.1 | 52.9 | 4.4 | 2.7 | 2.9 | 19.7 | 48.4 | 81.3 | 1.7 |
| 24 | NM 5 | 65.3 | 55.0 | 49.2 | 3.2 | 2.4 | 2.2 | 21.5 | 39.7 | 64.9 | 1.6 |
| 25 | NM 6 | 62.3 | 52.9 | 51.7 | 3.0 | 2.5 | 2.2 | 24.0 | 39.7 | 61.9 | 1.6 |
| 26 | NM 7 | 22.1 | 20.8 | 17.6 | 1.2 | 1.1 | 1.2 | 14.0 | 21.5 | 127.5 | 5.9 |
| Mean | 81.2 ± 50.7‡ | 76.4 ± 48.4‡ | 66.4 ± 41.2‡ | 4.2 ± 3.1‡ | 3.0 ± 2.0‡ | 2.8 ± 1.8‡ | 23.0 ± 6.6‡ | 65.4 ± 44.6‡ | 91.0 ± 26.2‡ | 2.1 ± 1.8‡ | |
| 27 | M 1 | 111.7 | 93.8 | 89.8 | 1.7 | 5.7 | 4.9 | 72.3 | 66.5 | 64.6 | 1.0 |
| 28 | M 2 | 71.9 | 56.9 | 52.1 | 2.9 | 1.9 | 1.9 | 24.2 | 58.2 | 125.4 | 2.2 |
| 29 | M 3 | 70.5 | 55.9 | 51.6 | 2.7 | 1.9 | 1.8 | 20.2 | 56.3 | 87.5 | 1.6 |
| 30 | M 4 | 66.5 | 56.2 | 51.6 | 6.3 | 4.4 | 4.0 | 45.1 | 56.2 | 109.3 | 1.9 |
| 31 | M 5 | 55.1 | 48.1 | 43.3 | 4.1 | 3.1 | 2.7 | 36.5 | 46.3 | 112.7 | 2.4 |
| 32 | M 6 | 55.4 | 57.5 | 43.6 | 2.7 | 1.9 | 1.9 | 21.7 | 46.2 | 106.4 | 2.3 |
| 33 | M 7 | 58.9 | 49.0 | 44.7 | 2.5 | 2.0 | 2.0 | 36.9 | 45.1 | 82.9 | 1.8 |
| 34 | M 8 | 55.9 | 53.3 | 43.4 | 3.3 | 1.9 | 2.0 | 20.0 | 44.9 | 96.5 | 2.1 |
| 35 | M 9 | 73.6 | 61.2 | 55.0 | 3.6 | 1.9 | 2.0 | 25.4 | 44.6 | 98.1 | 2.2 |
| 36 | M 10 | 56.3 | 52.5 | 42.5 | 2.6 | 1.9 | 1.8 | 20.1 | 44.4 | 102.4 | 2.3 |
| 37 | M 11 | 47.7 | 38.9 | 33.5 | 2.1 | 1.7 | 1.6 | 16.1 | 42.5 | 124.2 | 2.9 |
| 38 | M 12 | 61.1 | 60.2 | 47.8 | 3.8 | 2.2 | 2.2 | 35.0 | 42.5 | 98.2 | 2.3 |
| 39 | M 13 | 45.3 | 37.1 | 34.0 | 1.7 | 1.5 | 1.5 | 17.4 | 41.6 | 131.7 | 3.2 |
| 40 | M 14 | 48.1 | 40.4 | 35.8 | 2.1 | 1.9 | 1.7 | 16.5 | 39.5 | 59.2 | 1.5 |
| 41 | M 15 | 52.4 | 56.6 | 41.7 | 3.6 | 2.3 | 2.3 | 16.6 | 35.1 | 50.8 | 1.4 |
| 42 | M 16 | 56.9 | 46.8 | 41.7 | 3.2 | 1.8 | 1.8 | 20.3 | 34.5 | 60.7 | 1.8 |
| 43 | M 17 | 51.6 | 43.7 | 37.6 | 2.9 | 1.6 | 1.6 | 22.6 | 32.3 | 119.2 | 3.7 |
| 44 | M 18 | 30.7 | 28.0 | 24.0 | 1.2 | 1.1 | 1.2 | 14.3 | 27.6 | 101.1 | 3.7 |
| 45 | M 19 | 31.1 | 30.2 | 24.6 | 2.0 | 1.5 | 1.4 | 14.3 | 25.2 | 60.1 | 2.4 |
| 46 | M 20 | 28.3 | 27.5 | 23.2 | 2.0 | 1.5 | 1.6 | 12.7 | 23.3 | 61.5 | 2.6 |
| 47 | M 21 | 8.9 | 10.9 | 8.3 | 1.2 | 1.1 | 1.2 | 12.0 | 8.7 | 68.4 | 7.9 |
| Mean | 54.2 ± 20.6‡ | 47.8 ± 16.8‡ | 41.4 ± 16.0‡ | 2.8 ± 1.1‡ | 2.1 ± 1.1‡ | 2.0 ± 0.9‡ | 24.8 ± 14.1‡ | 41.0 ± 13.2‡ | 91.5 ± 25.3‡ | 2.5 ± 1.4‡ | |
Samples refer to as non-milk-added coffee (NM 1–7; serving size of 200–275 mL) and milk-added coffee (M 1–21; serving size of 175–300 mL).
In the same columns, from 3-CQA to caffeine/CGAs ratio, there is no significant difference between 2 groups (non-milk-added coffee and milk-added coffee) based on t-test at 5% probability (P > 0.05).‡P > 0.05.
*
Data expressed as the mean value. Standard deviation < 7% of the mean in all instances (n = 3).