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HPLC following the degradation of ortho-quinone products from catecholamine metabolites at pH 6.8. (A,B) DOPE (1); (C,D) DOPEG (2); (E,F) DOPAC (3); (G,H) DOMA (4). For A, C, E and G, the oxidation was stopped by the addition of NaBH4; For B, D, F and H, the oxidation was stopped by the addition of ascorbic acid (AA). For the sake of clarity, the yields of DOPEG ketone (5) were multiplied by a factor of 10 in (D) and those of DHBAld (7) were by a factor of 5 in (F).
