Acylhydrazide Schiff bases: DPPH radical and superoxide anion scavengers.

Acylhydrazide Schiff bases 1-27 were evaluated for their in vitro DPPH radical and superoxide anion scavenging activity. They showed a varying degree of DPPH radical scavenging activity with IC(50) values between 31.25-473.59 µM. Compounds 8, 2, and 10 have IC(50) values 31.25 ± 1.32, 34.40 ± 0.66, and 37.24 ± 0.4 µM, respectively. Standard npropylgallate showed an IC(50) value 30.12 ± 0.27 µM. Acylhydrazides 1-27 exhibited in vitro superoxide anion scavenging activities with IC(50) values in the range of 175.6-450.89 µM. Results demonstrated that acylhyrazides 8, 2, and 10 have DPPH scavenging activity, comparable to standard n-propyl gallate while acylhyrazides 1-27 were found to be less superoxide anion scavenging active than the standard n-propyl gallate (IC(50) = 106.34 ± 1.6 µM).