Table 5.
CGAs and caffeine contents of franchise 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 | ||
| 66 | CS 1 | 86.9 | 191.3 | 112.2 | 6.6 | 4.3 | 5.5 | 24.2 | 172.4 | 213.3 | 1.2 |
| 67 | CS 2 | 88.9 | 194.3 | 114.9 | 7.9 | 4.9 | 6.6 | 23.2 | 145.4 | 174.2 | 1.2 |
| 68 | CS 3 | 84.9 | 201.4 | 111.5 | 9.1 | 6.0 | 8.6 | 21.0 | 141.6 | 122.2 | 0.9 |
| 69 | CS 4 | 64.0 | 140.5 | 83.0 | 5.8 | 3.7 | 4.8 | 20.4 | 132.2 | 205.7 | 1.6 |
| 70 | CS 5 | 69.7 | 145.9 | 89.2 | 6.0 | 3.8 | 4.9 | 19.5 | 120.3 | 186.0 | 1.5 |
| 71 | CS 6 | 70.2 | 145.5 | 89.2 | 7.7 | 4.7 | 6.3 | 25.0 | 115.0 | 192.1 | 1.7 |
| 72 | CS 7 | 54.2 | 108.9 | 68.6 | 4.6 | 2.9 | 3.6 | 18.2 | 86.1 | 188.6 | 2.2 |
| 73 | CS 8 | 44.2 | 92.1 | 56.1 | 3.6 | 2.4 | 3.0 | 11.1 | 68.0 | 153.2 | 2.3 |
| 74 | CS 9 | 27.6 | 57.1 | 34.6 | 2.5 | 1.9 | 2.1 | 10.4 | 42.2 | 91.7 | 2.2 |
| 75 | CS 10 | 25.5 | 47.6 | 31.5 | 2.1 | 1.7 | 1.9 | 10.2 | 39.7 | 165.2 | 4.2 |
| 76 | CS 11 | 19.5 | 37.6 | 23.8 | 1.8 | 1.5 | 1.5 | 8.1 | 31.0 | 134.6 | 4.3 |
| Mean | 57.8 ± 25.5 | 123.8 ± 59.7 | 74.1 ± 33.6 | 5.2 ± 2.5 | 3.4 ± 1.5 | 4.4 ± 2.3 | 17.4 ± 6.3 | 99.4 ± 48.6 | 166.1 ± 37.5b | 2.1 ± 1.1 | |
| 77 | FFR 1 | 80.7 | 171.9 | 103.9 | 7.1 | 4.7 | 6.1 | 22.4 | 134.9 | 182.9 | 1.4 |
| 78 | FFR 2 | 62.5 | 151.2 | 83.9 | 7.3 | 4.8 | 6.7 | 18.1 | 90.3 | 102.9 | 1.1 |
| 79 | FFR 3 | 42.7 | 92.8 | 55.4 | 3.4 | 2.5 | 3.0 | 10.7 | 63.1 | 96.2 | 1.5 |
| 80 | FFR 4 | 46.4 | 91.9 | 54.9 | 9.4 | 6.1 | 7.4 | 15.4 | 62.5 | 48.7 | 0.8 |
| Mean | 58.1 ± 17.3 | 126.9 ± 40.8 | 74.5 ± 23.8 | 6.8 ± 2.5 | 4.5 ± 1.5 | 5.8 ± 2.0 | 16.7 ± 4.9 | 87.7 ± 34.0 | 107.7 ± 55.7ab | 1.2 ± 0.3 | |
| 81 | B 1 | 51.7 | 113.9 | 65.5 | 4.5 | 3.1 | 3.9 | 14.0 | 77.0 | 98.9 | 1.3 |
| 82 | B 2 | 34.9 | 69.3 | 43.0 | 3.9 | 2.7 | 3.1 | 13.9 | 54.6 | 104.4 | 1.9 |
| 83 | B 3 | 23.1 | 48.7 | 29.9 | 2.4 | 1.8 | 2.2 | 57.3 | 49.6 | 77.3 | 1.6 |
| Mean | 36.6 ± 14.4 | 77.3 ± 33.4 | 46.1 ± 18.0 | 3.6 ± 1.1 | 2.5 ± 0.7 | 3.0 ± 0.9 | 28.4 ± 25.1 | 60.4 ± 14.6 | 93.6 ± 14.3a | 1.6 ± 0.3 | |
Samples refer to as coffee shop coffee (CS 1–11), fast food restaurant coffee (FFR 1–4) and bakery coffee (B 1–3).
In the same columns, from 3-CQA to caffeine/CGAs ratio except for caffeine, there is no significant difference between the three groups (coffee shop coffee, fast food restaurant coffee, and bakery coffee) based on Tukey’s test 5% probability (P > 0.05).
In the same column of caffeine, there is a significant difference between the three groups (coffee shop coffee, fast food restaurant coffee, and bakery coffee) based on Tukey’s test (P < 0.05).
*
Data expressed as the mean value. Standard deviation < 7% of the mean in all instances (n = 3).