Extraction of Pregabalin in Urine Samples Using a Sulfonated Poly(ether ether ketone) Membrane

Figure 5

HPLC chromatogram of pregabalin (a) before extraction at 5 µL spiked sample and (b) after SPEEK extraction of drug-free urine sample spiked at 0.1 µg/mL.

(a)

(b)