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Oxidation of salbutamol (A) and fenoterol (B) by MPO/H2O2 – effect of ascorbic acid. Salbutamol (1 mM) and fenoterol (200 μM) were exposed to MPO (200 mU/mL) and H2O2 (50 μM) in the absence and presence of 10, 20, 40 and 100 μM ascorbic acid (traces a-e, respectively) in pH 7.0 buffer (50 mM phosphate containing 100 μM DTPA) and A315 was measured in 30 s intervals following H2O2 addition.
