Figure 1: Peaks resolution of the HPLC method: R > 1,5 Chromatograms, 1. Codeine 5 μg/mL (285 nm) 2. Pseudomorphine 5 μg/mL (254 nm) 3. Apomorphine 5 μg/mL (210 nm) 4. Morphine 33 μg/mL (285 nm) 5. Mixed solution : Morphine 33 μg/mL in stress condition, Codeine 7 μg/mL, Pseudomorphine 10 μg/mL, Apomorphine 1 μg/mL (254 nm)