A Review Article on Anti-Oxidant Activity of Zingiber Officinale (Ginger)

Ginger (Zingiber officinale), a rhizomatous spice from the Zingiberaceae family, exhibits potent antioxidant properties primarily through its bioactive phenolic compounds, including gingerols, shogaols, paradols, and zingerone. These compounds scavenge reactive oxygen species (ROS) such as superoxide, hydroxyl, and nitric oxide radicals in a dose-dependent manner, while activating the Nrf2 signaling pathway to upregulate endogenous enzymes like superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), and glutathione (GSH).This dual action reduces lipid peroxidation, malondialdehyde (MDA) levels, and oxidative damage to lipids, proteins, and DNA, mitigating cellular stress linked to chronic diseases.Mechanistically, ginger inhibits pro-inflammatory pathways by suppressing NF-κB and Akt activation, thereby lowering cytokines like TNF-α, IL-1β, and IL-6, which interconnect oxidative stress and inflammation. In-vivo and in vitro studies confirm enhanced antioxidant enzyme expression and reduced ROS in models of toxicity, diabetes, and neurodegeneration, with 6-shogaol showing superior efficacy over 6-gingerol. Ethanolic extracts often outperform aqueous ones in free radical scavenging and ferric reducing power.Ginger’s immunomodulatory effects stem from balancing Th1/Th2 responses and cytokine profiles, bolstering innate and adaptive immunity against infections and ageing-related decline. Varieties like red ginger display higher phenolic content and DPPH scavenging activity. Despite promising therapeutic potential in functional foods and supplements, optimal dosing, toxicity thresholds, and human trials require further exploration for clinical translation.