: HPLC, UV DETECTION
ANALYTE: Warfarin
EXTRACTION: 5 mL methanol; swirl
INJECTION
VOLUME: 20 µL
MOBILE PHASE: 30% 0.0025 N phosphoric acid and 70% methanol, isocratic, 1.5 mL/min, ambient temperature
COLUMN: C18 reverse phase, 10-µm packing, 25 to 30 cm
DETECTOR: UV absorption @ 280 nm
CALIBRATION: standard solutions of Warfarin in methanol
RANGE: 20 to 200 µg per sample
ESTIMATED LOD: 2.5 µg per sample
PRECISION (Sr): 0.016 [1]