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  • Title: [Determination of tramadol hydrochloride in serum samples by disk solid phase extraction and gas chromatography-mass spectrometry in selected ion monitoring].
    Author: Zhu BL, Zhang L, Zhang SY.
    Journal: Fa Yi Xue Za Zhi; 2006 Dec; 22(6):428-30. PubMed ID: 17285864.
    Abstract:
    OBJECTIVE: Disk solid phase extraction (SPE) was assessed for tramadol hydrochloride from serum. METHODS: The SPE was performed with SPEC C18AR/MP3 Disk SPE cartridge, offering hydrophobic C18 and strong cation ionic exchange interactions for the analytes, before being added into extraction column, 1 mL serum was diluted by 2 mL 0.1 mol/L phosphate buffer solution (pH 6) and the eluent was ethyl acetate containing 2% ammonia. Then SKF525 was added as internal standard into samples, which would be extracted simultaneously with analyte,quantitatively, determined by GC/MS/SIM. RESULTS: The extraction recovery of tramadol hydrochloride was 98.9%, 92.5% and 84.8% for serum samples with corresponding amounts of standard addition of 0.1 microg/mL, 0.2 microg/mL and 0.5 microg/mL. And RSD measured 5 times was 3.2%, 8.7% and 10.9% respectively. The linear range varied from 0.1 microg/mL to 4 microg/mL. The multinomial regression correlation coefficient (r2) equaled 0.9939, and the detection limit was 21 ng/mL. After the same extraction column was continuously used for 5 times, there was no jam, pollution and decline of recovery and RSD. CONCLUSION: This method is suitable for forensic toxicological analysis.
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