Table 2. Results of Method Validation for Selected Compounds.
| aspartamea |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
| caffeine | light sample | zero sample | acesulfame-K | cyclamate | benzoate | E150D | vanillin | HMF | |
| LOD (mg/L) | 1.7 | 4.6 | 2.9 | 0.75 | 1.6 | 0.97 | 41 | 0.6 | 0.7 |
| LOQ (mg/L) | 5.3 | 18.0 | 8.8 | 2.5 | 4.7 | 3.4 | 140 | 2.1 | 2.4 |
| precision intraday (%) | |||||||||
| standard solutionb | 4.2 (108) | 0.8 (240) | 1.0 (240) | 2.2 (160) | 1.2 (242) | 0.7 (210) | 2.7 (2.00) | 1.9 (20) | 18 (4.0) |
| authentic sampleb | 1.6 (100) | 5.4 (240) | 8.8 (390) | 2.8 (160) | 2.6 (253) | 2.2 (146) | 6.8 (2.05) | 1.9 (16) | 19 (4.7) |
| precision interday (%) | |||||||||
| standard solution | 4.0 | 1.2 | 2.3 | 2.9 | 0.8 | 0.9 | 2.6 | 5 | 18 |
| authentic sample | 1.5 | 6.3 | 6.7 | 3.1 | 3.7 | 2.8 | 6.5 | 3.1 | 17 |
| recovery range: at two concentrationsb | 100 (101) | 103 (100) | 107 (100) | 94 (100) | 102 (242) | 99 (84) | 99 (500) | 140 (20) | 67 (6.3) |
| 103 (51) | 103 (50) | 97 (50) | 96 (50) | 106 (133) | 96 (42) | 103 (250) | 164 (10) | 91 (3.1) | |
a
Two signals were used depending of the amount of citric acid: for the light sample, the doublet between 2.73 and 2.76 ppm was integrated, and for zero samples, the multiplet between 3.03 and 3.11 ppm was integrated.
b
Concentrations used for validation are given in parentheses (expressed in mg/L).