long-term stability and reproducibility of the liquid chromatographic system is attained by selection of optimised conditions for chromatographic separation with a formate mobile phase and produces detection limits of 1.4 , 1.8 and 2.2 nmol/l for norepinephrine , epinephrine and dopamine , respectively , in urine samples and day-to-day coefficients of variation of less than 6 % .
C0028351
norepinephrine
C0014563
epinephrine