High-throughput on-line solid-phase extraction–liquid chromatography–tandem mass spectrometry method for the simultaneous analysis of 14 antidepressants and their metabolites in plasma

• Published in: Journal of Chromatography A Vol. 1160; no. 1; pp. 3 - 12
• Main Authors: de Castro, Ana, Fernandez, Maria del Mar Ramírez, Laloup, Marleen, Samyn, Nele, De Boeck, Gert, Wood, Michelle, Maes, Viviane, López-Rivadulla, Manuel
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 10.08.2007; Elsevier
• Subjects: Analysis; Antidepressant; Antidepressive Agents - blood; Antidepressive Agents - metabolism; Biological and medical sciences; Chromatography, Liquid; Deuterium; General pharmacology; Humans; LC–MS/MS; Medical sciences; On-line SPE; Online Systems; Pharmacology. Drug treatments; Plasma; Quality Control; Solid Phase Extraction - methods; Tandem Mass Spectrometry - methods; Antidepressant; On-line SPE; Plasma; LC–MS/MS; Trace analysis; Validation; Solid phase extraction; Biological fluid; Automation; Chemical analysis; Metabolite; Coupled method; Psychotropic; HPLC chromatography; Electrospray; Blood; Chemical enrichment; Blood plasma; LC-MS/MS; Sample preparation; Mass spectrometry MS/MS; Simultaneous measurement; Antidepressant agent; Quantitative analysis
• ISSN: 0021-9673
• DOI: 10.1016/j.chroma.2007.01.137

A rapid, sensitive and fully automated on-line solid-phase extraction–liquid chromatography–tandem mass spectrometry (SPE–LC–MS/MS) method was developed and validated for the direct analysis of 14 antidepressants and their metabolites in plasma. Integration of the sample extraction and LC separation into a single system permitted direct injection of the plasma without prior sample pre-treatment. The applied gradient ensured the elution of all the examined drugs within 14 min and produced chromatographic peaks of acceptable symmetry. The total process time was 20 min and only 50 μL of plasma was required. Selectivity of the method was achieved by a combination of retention time and two precursor-product ion transitions for the non-deuterated compounds. The use of SPE was demonstrated to be highly effective and led to significant decreases in the interferences present in the matrix. Extraction was found to be both reproducible and efficient with recoveries >99% for all the analytes. The method showed excellent intra-assay and inter-assay precision (relative standard deviation (RSD) and bias <20%) for quality control (QC) samples spiked at a concentration of 40, 200 and 800 μg/L and the r 2 > 0.99 over the range investigated (10–1000 μg/L). Limits of quantification (LOQs) were estimated to be 10 μg/L. Furthermore, the processed samples were demonstrated to be stable for at least 48 h, except for clomipramine and norclomipramine, where a slight negative trend was observed, but did not compromise the quantification. The method was subsequently applied to authentic samples previously screened by a routine HPLC method with diode array detection (DAD).