Add time:08/13/2019         Source:sciencedirect.com

A high-performance capillary electrophoresis (HPCE) assay was used to determine the concentration of a potent cytotoxic agent, dolastatin-10, in human plasma. Following extraction from plasma, using a solid-phase C18 cartridge, capillary zone electrophoresis was used to separate, detect and quantitate dolastatin-10 using the structurally related compound dolastatin-15 as the internal standard. Migration times for both dolastatins are less than 20 min. The recovery of the drug was approximately 90% and was quantified over the assay range of 39 to 5000 ng/ml with good precision and accuracy. The method is linear up to 5000 ng/ml with a lower limit of detection of 25 ng/ml. Data resulting from the use of the assay for the in vitro metabolism of the drug are presented. This is the first report of a validated HPCE assay for determining dolastatin-10 levels in human plasma.

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