Determination of sacubitril and seven sartan drugs in serum samples by online solid phase extraction-liquid chromatography-tandem mass spectrometry

An online solid phase extraction–ultra performance liquid chromatography–tandem mass spectrometry detection method was developed for the simultaneous determination of sacubitril and seven sartan drugs in blood serum in this study. The compounds were separated through a C₁₈ column. Mass spectrometry of the samples was performed using a jet stream electrospray ion source (AJS, ESI+). The samples were detected via a multiple reaction monitoring (MRM) mode and quantified via a stable isotope internal standard method. 900 μL of prepared sample was injected and a run time of 12.5 minutes was obtained in this proposed method. The eight examined target compounds showed good linearity (r²＞0.994) in the corresponding mass concentration range and a lower limit of quantitation (LLOQ) was in the range of 0.05–0.1 μg/L. The recovery of the spiked serum samples ranged from 90.90 % to 106.20 % with relative standard deviations (RSDs) of 4.57 %–9.27 %. Five target compounds were detected in the actual serum samples using this method. The proposed method is simple to use, sensitive, accurate, and suitable for the trace detection of sacubitril and seven sartan drugs present in serum samples. The method can meet the needs for clinical monitoring of blood concentrations of this type of drug, while providing detection technology support for the development of compound preparations of sacubitril and other sartan drugs.