ABSTRACT
The effect of free radicals on human beings has come to attract considerable attention due t their close relation to toxicity and disease. The aim of the present investigation is to evaluate the antioxidant efficacy of fresh garlic extract [FGE], aged garlic extract [AGE] and ginger ethanolic extract [GEE] against the oxidative stress induced by thioacetamide administration. Silymarin and Hipamax plus [HP] were employed in the current study as reference materials used in the treatment of liver diseases. Intraperitoneal [ip] administration of thioacetamide [200 mg/kg b.wt., three times a week for four weeks] induced oxidative stress that confirmed by the significant elevation of malondialdehyde [MDA, as an indicator of lipid peroxidation], nitric oxide [NO], myeloperoxidase activity [MPO] with the decline in glutathione content [GSH] and the activities of superoxide dismutase [SOD], glutathione peroxidase [GSHPx], glutathione S-transferase [GST] in liver tissue. Meanwhile, there was no change in protein carbonyl. The pre and co-administration of fresh garlic extract, aged garlic extract and ginger ethanolic extract with thioacetamide significantly reduced MDA, NO, MPO activity and enhanced the activity of SOD, GSHPx, GST and markedly increase GSH content in liver tissue. In conclusion, the test materials employed in the current study displayed well marked antioxidant potency and more pronounced antioxidant potency was exerted by AGE