Table 1a. Results of the Accuracy Test with Three Different Concentrations of HPLC-DAD and the GC-FID Methoda (Revised).
| DNPH method HPLC-DAD |
p-toluenesulfonic acid liquid GC-FID |
||||
|---|---|---|---|---|---|
| concentration (μg/mL) | %recovery | RSD (%) | concentration (μg/mL) | %recovery | RSD (%) |
| 1 | 101.16 | 0.22 | 400 | 101.50 | 1.48 |
| 2 | 101.15 | 0.50 | 500 | 101.37 | 0.56 |
| 3 | 100.82 | 0.59 | 600 | 101.99 | 1.02 |
a
Acceptance criteria: %Recovery: 95–105%; RSD: 3.7% DNPH (2,4-dinitrophenylhydrazine). HPLC-DAD (high-performance liquid chromatography-diode array detector). SHS-GC-MS (static headspace-gas chromatography-mass spectrometry). GC-FID (gas chromatography-flame ionization detection). RSD (relative standard deviation).