Evaluation of matrix microsampling methods for therapeutic drug candidate quantification in discovery-stage rodent...

AMG 517 or 1-aminobenzotriazole were quantified by LC-MS/MS from low blood/plasma volumes for rat pharmacokinetic (PK) characterization in order to qualify manual/automated dried blood spot (DBS) sampling and plasma separation capillary sampling. In addition, mouse serial automated blood sampling was compared with standard composite sampling.

AMG 517 or 1-aminobenzotriazole was administered to rats or mice and multiple microsampling techniques were used to obtain blood or plasma.

PK parameters derived from DBS and whole blood-obtained drug concentrations were within 7% for manual DBS and 20% for automated DBS. Plasma PK parameters derived from capillary or standard plasma-obtained drug concentrations differed by 6%. Plasma PK parameters obtained from serial automated blood sampling or manual composite sampling were within 20%.

Collectively, these results suggest that the microsampling applications that were investigated are attractive approaches for quantifying drug candidates in low matrix volumes that can be successfully employed within discovery-stage rodent PK studies.