Abstract

Study of antioxidant activity of ethanolic extract of fresh Eichhornia crassipes (Mart.)Solms

Waterhyacinth (Eichhornia crassipes) is a fast growing perennial aquatic macrophyte. It is well known to absorb and accumulate a large number of heavy metals and organic pollutants. The present study was designed to evaluate the antioxidant activity of ethanol extract of fresh Eichhornia crassipes by two different methods-reducing power assay and DPPH assay. Reducing power assay was evaluated at different concentrations and time delay. The reducing power of extract increases with increasing concentration of extract and 50μg/ml of extract gave 0.67 absorbance at 680 nm, comparable with the absorbance of »400μg/ml of standard (ascorbic acid). With variation in time, absorbance increased. Maximum absorbance (0.88) was noted with 10μg/ml of the extract in 30 min which was comparable to the absorbance of 500μg/ml of ascorbic acid. The free radical scavenging activity of 29μg of the ethanol extract was found to be comparable to the activity of 400μg of ascorbic acid. The result shows the potential of waterhyacinth as a source of useful natural antioxidants.


Author(s): Thamaraiselvi, P. Lalitha and P. Jayanthi

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