Removal of Triton X-100 from Plasma Samples Using Mixed-Mode Solid Phase Extraction (SPE)
نویسندگان
چکیده
in t ro du C t io n Pharmaceutical dosing vehicle excipients such as Triton X-100 are often added to formulations to facilitate dissolution in dosing media. Unfortunately, these compounds can cause significant matrix effects, typically ion suppression, in LC/MS/MS analyses. The use of fast LC gradients, common in drug discovery, can result in co-elution of target analytes with these compounds. Early pharmacokinetic (PK) time points, when the concentration of these excipients is elevated, can be particularly troublesome as this co-elution has been shown to be a major contributing factor to excipient related ion suppression.1-3 Several approaches have been investigated to attempt to minimize this problem, including LC gradient manipulation,2,3 alternative analytical column choices,1 different sample preparation strategies,1-3 sample dilution,5 and even the development of a novel formulating agent. 4 While some of these strategies have been successful, they each have their limitations. Clearly, the choice of formulation excipient is often beyond the control of the analyst. LC optimization, either by gradient or mobile phase manipulation, or by alternative column selection can solve this problem for some analytes, but not always, and requires additional method development. In addition, extensive manipulation of LC conditions is not always conducive to a high-throughput screening environment.
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