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Effect glutathione (GSH), N-acetyl-L-cysteine (NAC), sodium metabisulphite (Na+ m-bisulphite), N-ter-butyl-α-phenylnitrone (N-tBAP) and deferoxamine on autoxidation of (A) 1 mM L-DOPA and (B) 1 mM dopamine working solutions for 24 and 48 h. Each column represents the mean of four experiments per group; vertical lines show s.e.mean. *P<0.05 compared with control.
