Semi-automated direct elution of dried blood spots for the quantitative determination of guanfacine in human blood
- PMID: 22793029
- DOI: 10.4155/bio.12.111
Semi-automated direct elution of dried blood spots for the quantitative determination of guanfacine in human blood
Abstract
Background: Direct analysis of dried blood spot (DBS) samples was investigated using a prototype semi-automated robotic device that allows the direct elution of sample spots from a DBS paper card to an online SPE cartridge. The eluted SPE samples were analyzed with high-performance LC-MS/MS.
Results: A LLOQ of 0.01 ng/ml was achieved with a linear calibration range from 0.01 to 25 ng/ml. Optimal performance data were obtained from spotting the internal standard solution on the card before blood spotting. Internal standard addition from the system injector loop produced intra-assay inaccuracy of -9.0-7.3% and precision of 1.3-8.2%, and inter-assay inaccuracy of -3.5-3.9% and precision of 4.4-8.7%.
Conclusion: Results demonstrated the feasibility of a semi-automated online rapid direct elution method that avoids manual extraction for DBS sample analysis using the online DBS-SPE system coupled to LC-MS/MS.
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