Synthesis, Antioxidant activity and Structure-Activity Relationship of gallic hydrazones Analogues
Abstract A series of gallic acid hydrazones were designed and synthesized as new potential anti-oxidant agents. Most of these compounds are potent antioxidants. The strongest compounds are 11 and 15 (EC50: 6.42 μg·mL−1, 6.86 μg·mL−1, DPPH) and (EC50: 12.85μg·mL−1, 12.49μg·mL−1ABTS), more potent than the positive control Trolox. Furthermore, the promising compounds 11 and 15 exhibited very low cytotoxic activity against HEK293 cell (IC50 >56.4 µM). The SAR study revealed that the pattern of hydroxyl, methoxy and methyl substituents on the gallic hydrazones framework can increase the antioxidant properties of the prototype compounds. Moreover, the results also showed that the activity increased with the number of the groups and increased following hydroxyl > methoxy > methyl. Overall, the present study suggests that the designed compounds may serve as lead molecules for developing novel anti-oxidative agents in food industry.