Isocratic High Performance Liquid Chromatographic Method for Determination of Metoprolol and Its Metabolite in Human Urine
Kata Kunci:
high performance liquid chromatography, metoprolol, metabolite, human urineAbstrak
Metode kromatografi cair kinerja tinggi (KCKT) secara isokratik telah dikembangkan untuk penentuan metoprolol (MET) dan α-hidroksimetoprolol (α-OH MET) dalam urin manusia. Ekstraksi cair-cair menggunakan diklormetan setelah penambahan NaOH. Pemisahan dilakukan pada kolom Purospher® STAR RP-18e LiChroCART® (250 x 4,6 mm, 5μm) dengan fase gerak campuran kalium dihidrogen fosfat 25 mmol/L (pH 3,0), asetonitril dan metanol (70:15:15 v/v). Deteksi dengan detektor ultraviolet pada λ234 nm. Validasi metode meliputi linieritas, akurasi, presisi dan spesifisitas. Kurva kalibrasi linier pada rentang 1,0-64,0 μg/mL untuk kedua analit dengan koefisien korelasi 0,999. Metode menunjukkan presisi yang baik dengan nilai relative standard deviation (RSD) <2%. Perolehan kembali pada rentang 98,36±1,68 sampai 101,32±1,36 % dengan batas deteksi MET dan α-OH MET masing-masing 0,22 dan 0,14 μg/mL. Metode KCKT yang dikembangkan menunjukkan sensitivitas dan reliabilitas yang memadai untuk penentuan MET dan α-OH MET secara simultan dalam sampel urin.
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