Table 2.

SOD-like activity of the porphyrins studied.^a

Porphyrin	IC50, Mb	log kcatc	Ref.
MnIIITM-3-PyP5+	6.5 × 10−7	6.61	[26]
MnIIBr8TM-3-PyP3+	≤3.7 × 10−9	≥8.85	this work
MnIIITM-4-PyP5+	6.7 × 10−7	6.58	[26]
MnIIBr8TM-4-PyP4+	≤5.6 × 10−9	≥8.67	this work
Cu,Zn-SOD	1.3 × 10−9	ca. 9	[35–37]

^aConditions: 0.05 M phosphate buffer, 0.10 mM EDTA, pH 7.8, 40 μM xanthine, ~ 10 μM cytochrome c.

^bIC₅₀ is the concentration of compound that causes a 50% inhibition of the cyt c reduction by O^•−. The errors in IC₅₀ are within 10%.

^cError of ± 10 %.