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This report addresses the continuing need for increased throughput in the evaluation of new chemical entities (NCEs) in terms of their pharmacokinetic (PK) parameters by describing an alternative procedure for increasing the throughput of the in vivo screening of NCEs in the oral rat PK model. The new approach is called ‘cassette‐accelerated rapid rat screen’ (CARRS). In this assay, NCEs are dosed individually (n = 2 rats/compound) in batches of six compounds per set. The assay makes use of a semi‐automated protein precipitation procedure for sample preparation in a 96‐well plate format. The liquid chromatography/atmospheric pressure ionization tandem mass spectrometry (LC/API‐MS/MS) assay is also streamlined by analyzing the samples as ‘cassettes of six’. Using this new approach, a threefold increase in throughput was achieved over the previously reported ‘rapid rat screen’. Copyright © 2001 …