Determination of Plasma Concentration of Mycophenolic Acid in Renal Transplantation Patients by HPLC-Fluoremetry

OBJECTIVE:To determine the plasma concentration of mycophenolic acid (MPA) in renal transplantation patients by HPLC-Fluoremetry. METHODS: The sample was subjected to precipitation of proteins using 5% Zinc Sulfate methanol saturated solution,and the supernatant (20 μL) was taken for sample injection and determination on Zorbax Eclipse XDB C18 with mobile phase consisted of acetonitrile-methanol-0.2 mol·L-1 glycine buffer(18∶2∶80,pH=9.0) at a flow rate of 1.0 mL·min-1. The column temperature was of 25℃;the excitation wavelength(EX) was 342 nm and the emission wavelength(EM) was 425 nm. RESULTS: The linear range of MPA was 0.5～40 mg·L-1,with its lowest limit of quantitation at 0.5 mg·L-1. The methodology recovery was 98.23%～101.00%;the extraction recovery of MPA was 91.56%～94.46%;the intra-day RSD was 0.64%～3.22% and the inter-day RSD was 5.12%～6.10%. CONCLUSION: The method is sensitive,rapid,accurate,convenient,and applicable for the quantitative determination of plasma concentration of MPA in renal transplantation patients.