SPE (Solid Phase Extraction)
rat plasma stabilized with K2EDTA was spiked directly from stock standard to a level of 400 ng/mL
HybridSPE-Phospholipid 96-Well Plate, 50 mg/2 mL (575656-U)
apply 100 μL of plasma to plate, followed by 300 μL of 1% formic acid acetonitrile. Agitate via vortex for 4 min
place on vacuum manifold and apply 10” Hg vacuum for 4 minutes. Collect filtrate and analyze directly.
Ascentis Express HILIC, 10 cm x 2.1 mm I.D., 2.7 μm particles (53939-U)
[A] 5 mM ammonium formate; [B] 5 mM ammonium formate in acetonitrile; (5:95, A:B, pH 7.0 with formic acid)
0.4 mL/min
1305 psi (90 bar)
35 °C
ESI(+), full scan, m/z 100-1000
0.5 μL
plasma extract, analyte concentration of final sample work up is equivalent to 100 ng/mL
The basic characteristics of these compounds make them targets for HILIC chromatographic separation. HILIC mobile phases consist of a high composition of acetonitrile, which facilitates the direct analysis of precipitated plasma samples without the need for additional sample solvent exchange. In most cases, the high organic mobile phase also facilitates increased analyte response in ESI(+) MS detections. This application used HybridSPE-Phospholipid sample prep to remove phospholipids and precipitated proteins prior to LC/MS analysis on an Ascentis Express HILIC Fused-Core HPLC column. The highest grade solvents provided clean, robust operation. Cerilliant CRMs provided reliable quantification. The resulting method was robust and sensitive.
Ascentis is a registered trademark of Merck KGaA, Darmstadt, Germany
HybridSPE is a registered trademark of Merck KGaA, Darmstadt, Germany