title: [Determination of tramadol hydrochloride in serum samples by disk solid phase extraction and gas chromatography-mass spectrometry in selected ion monitoring].
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.
  
  
  CONCLUSIONS
  This method is suitable for forensic toxicological analysis.
authors.affiliation: School of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350002, China. 26L506@126.com
authors.forename: Bin-ling
authors.initials: BL
authors.lastname: Zhu
authors.forename: Lan
authors.initials: L
authors.lastname: Zhang
authors.forename: Shao-yu
authors.initials: SY
authors.lastname: Zhang
mesh_terms: D000701:Analgesics, Opioid / Q000032:analysis* / Q000097:blood; D053593:Forensic Toxicology; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction; D012997:Solvents / Q000737:chemistry; D015813:Substance Abuse Detection / Q000379:methods; D014147:Tramadol / Q000032:analysis* / Q000097:blood / Q000737:chemistry
chemical_list: D000701:Analgesics, Opioid; D012997:Solvents; D014147:Tramadol