Table 3 Accuracy, Intra and inter day precisions for GF-HS-SDME of 4-MeI extraction in real samples (mean ± SDa, n = 3)
Sample | Amount measured in sample (µg L−1) | 4-MeI added (µg L−1) | Intra-day precision | Inter-day precision | ||
|---|---|---|---|---|---|---|
4-MeI found (µg L−1 ± SD) | Recovery (RSD%) | 4-MeI found (µg L−1 ± SD) | Recovery (RSD%) | |||
Distilled water | Not Detected | 10.0 | 8.7 ± 0.5 | 86.7 (0.6) | 9.3 ± 0.3 | 93.0 (0.4) |
100.0 | 91.3 ± 2.0 | 91.3 (2.2) | 90.6 ± 1.5 | 90.6 (1.6) | ||
200.0 | 179.6 ± 1.4 | 89.8 (1.5) | 176.3 ± 2.7 | 88.1 (3.0) | ||
Energy drink-1 | Not Detected | 10.0 | 8.7 ± 0.2 | 86.7 (0.2) | 9.1 ± 0.8 | 90.7 (0.9) |
100.0 | 87.0 ± 2.0 | 87.0 (2.3) | 85.2 ± 1.2 | 85.2 (1.4) | ||
200.0 | 184.8 ± 1.3 | 92.4 (1.4) | 182.4 ± 2.6 | 91.2 (2.9) | ||
Energy drink-2 | 17.5 | 10.0 | 26.2 ± 1.3 | 86.7 (1.5) | 24.7 ± 1.4 | 85.3 (1.6) |
100.0 | 102.6 ± 1.9 | 85.1 (2.2) | 102.9 ± 1.5 | 86.8 (1.7) | ||
200.0 | 197.2 ± 2.1 | 89.8 (2.3) | 197.5 ± 1.2 | 90.7 (1.4) | ||
Cola-1 | 101.2 | 10.0 | 110.1 ± 1.4 | 88.7 (1.6) | 107.4 ± 0.9 | 87.3 (1.0) |
100.0 | 189.5 ± 1.1 | 88.3 (1.2) | 189.2 ± 1.6 | 90.5 (1.8) | ||
200.0 | 280.8 ± 1.9 | 89.8 (2.1) | 279.5 ± 1.3 | 90.4 (1.5) | ||
Cola-2 | 60.1 | 10.0 | 68.9 ± 1.2 | 88.7 (1.4) | 68.9 ± 2.2 | 88.7 (2.5) |
100.0 | 146.3 ± 3.0 | 86.2 (3.4) | 148.0 ± 3.0 | 87.9 (3.4) | ||
200.0 | 241.9 ± 0.4 | 90.9 (0.4) | 240.9 ± 1.4 | 90.4 (1.5) | ||
Cola-3 | 38.3 | 10.0 | 46.8 ± 1.5 | 85.3 (1.7) | 46.1 ± 1.8 | 86.3 (2.1) |
100.0 | 126.3 ± 2.5 | 88.1 (2.9) | 125.3 ± 2.0 | 87.8 (2.2) | ||
200.0 | 224.2 ± 2.8 | 93.0 (3.0) | 222.9 ± 1.6 | 92.7 (1.7) | ||
Instant coffee-1 | Not Detected | 10.0 | 8.8 ± 0.3 | 88.3 (0.3) | 8.8 ± 1.3 | 87.7 (1.5) |
100.0 | 89.6 ± 2.9 | 89.6 (3.2) | 90.4 ± 0.8 | 90.4 (0.8) | ||
200.0 | 174.1 ± 2.5 | 87.1 (2.9) | 181.1 ± 0.9 | 90.5 (1.0) | ||
Instant coffee-2 | Not Detected | 10.0 | 9.1 ± 0.8 | 91.0 (0.9) | 9.1 ± 0.4 | 90.7 (0.5) |
100.0 | 86.0 ± 1.8 | 86.0 (2.1) | 91.8 ± 2.5 | 91.8 (2.7) | ||
200.0 | 172.6 ± 1.2 | 86.3 (1.4) | 177.1 ± 2.4 | 88.5 (2.7) | ||
Caramel-1 | 96.3 | 10.0 | 105.3 ± 1.0 | 89.7 (1.1) | 106.0 ± 2.3 | 91.0 (2.6) |
100.0 | 184.4 ± 0.8 | 88.0 (0.9) | 184.0 ± 0.9 | 87.2 (1.1) | ||
200.0 | 281.8 ± 1.3 | 92.7 (1.4) | 280.4 ± 1.2 | 91.8 (1.3) | ||
Caramel-2 | 106.7 | 10.0 | 115.4 ± 1.1 | 87.0 (1.2) | 112.7 ± 0.5 | 87.0 (0.5) |
100.0 | 194.2 ± 2.0 | 87.6 (2.2) | 193.2 ± 1.6 | 89.2 (1.8) | ||
200.0 | 292.7 ± 1.8 | 93.0 (1.9) | 289.4 ± 1.0 | 92.7 (1.1) | ||
Cola extract | 116.5 | 10.0 | 125.6 ± 1.2 | 91.0 (1.3) | 124.3 ± 1.4 | 87.7 (1.6) |
100.0 | 209.0 ± 3.1 | 92.5 (3.3) | 207.7 ± 3.0 | 92.2 (3.3) | ||
200.0 | 302.0 ± 2.1 | 92.8 (2.3) | 300.3 ± 1.5 | 92.4 (1.6) | ||
Coffee-1 | 36.4 | 10.0 | 45.6 ± 0.9 | 91.3 (1.0) | 44.6 ± 1.7 | 91.3 (1.9) |
100.0 | 127.3 ± 2.6 | 90.9 (2.9) | 125.0 ± 2.0 | 89.5 (2.3) | ||
200.0 | 212.1 ± 1.6 | 87.9 (1.8) | 216.1 ± 2.1 | 90.4 (2.3) | ||
Coffee-2 | 51.8 | 10.0 | 60.0 ± 2.8 | 81.7 (3.4) | 59.3 ± 1.4 | 89.0 (1.6) |
100.0 | 140.5 ± 2.7 | 88.7 (3.0) | 138.8 ± 2.9 | 88.4 (3.3) | ||
200.0 | 225.7 ± 2.4 | 87.0 (2.7) | 225.4 ± 1.8 | 87.5 (2.1) | ||