
The present study has been conducted to evaluate the antioxidant activity of medicinal plant Avicennia marina. Stem bark of Avicennia marina was powdered and extracted with 95% ethanol and water by cold extraction method. The water and ethanol extract of air dried stem bark was estimated by using spectrometric method. Antioxidant activity of Avicennia marina was determined in the presence of different methods namely reducing power assay, DPPH assay, Superoxide radical scavenging assay, Nitric oxide radical scavenging assay ect,.the determinations are conducted by in vitro methods the water and ethanolic plant extraction achieved a maximum antioxidant activity in a different concentration.