Concentration Determination of Catecholamine in Human Urine by HPLC-Electrochemistry / 中国药房

ABSTRACT

OBJECTIVE:To establish a method for the concentration determination of catecholamines in human urine. METH-ODSAfter extracted by aluminum oxide,using 3,4-dihydroxybenzylamine as internal standard,HPLC-electrochemistry was per-formed on the column of Shim-Pack C18 with mixed solution [every 500 ml mixed solution containing ion-pairing reagents(octane sulfonate) 0.5 mmol,methanol 10 ml,0.06 mmol/L Di-n-butylamine 50 μl,sodium acetate anhydrous 2.0 g,citric acid 5.5 g, EDTA-Na2 60 mg and sodium chloride 584.4 mg,pH=3.5] at a flow rate of 0.8 ml/min,column temperature was 30 ℃,detection voltage was 750 mV,and injection volume was 40 μl. RESULTS:The linear ranges were 3.125-100 ng/ml for both norepinephrine (r=0.998 5)and epinephrine(r=0.999 2),lower limits of quantitation were 3.125 ng/ml;RSDs of within days and daytime were lower than 10%,method recoveries were 99.2%-101.6% and 98.9%-100.5%,extraction recoveries were 63.8%-66.8% and 60.5%-62.6%. CONCLUSIONS:The method shows strong specificity,high sensitivity and low detection cost,and can be used for the concentration determination of catecholamines in human urine.