TABLE 1.

Rate of ABTS^·+ reduction by different organic acids^a

Organic acidb	Concn (μM) of ABTS·+ reduced min−1
None	0.056 ± 0.003
Acetate	0.077 ± 0.009
Tartrate	0.056 ± 0.007
Succinate	0.092 ± 0.011
Malonate	0.750 ± 0.043
Glyoxylate	0.347 ± 0.062
Oxalate	0.463 ± 0.031

^aThe ABTS^·+ concentration was 25 μM. 

^bAll acids were added to final concentration of 50 mM.