Fig. 2.
Effect of heptanesulfonate concentration of the mobile phase on the retention of DA, 5-HTP, DOPAC, 5-HT, N-methyl-5-HT, 5-HIAA and HVA. Mobile phase: citrate— Na2HPO4, 14% methanol, pH 3.9. See legend to Fig. 1 for derivation of k′.
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