Extraction of phenolic compounds from (Hops,grape seeds ) and study its antioxidant activity


Abstract in English

The phenolic compounds were extracted from leaves and flowers of Hops and grape seeds from local production by soaking with different solvents (Methanol-ethanol-alcohol and water mixture) . The polyphenols content in the methanol extracts for 100 g dry matter was 6.31 g for the grape seeds, 2.08 g for Hops leaves and 0.6 g for Hops flowers. Methanol extracts were characterized by an antioxidant activity that appeared by their ability to Reduce ions ferriques Fe+3, at a concentration of 2500 ppm, the Reducing Power was 96.45% , 67.56% for the grape seeds and Hops leaves, respectively. The methanolic extracts of grape seeds and Hops leaves at 80 ppm showed activity in scavenge free radical DPPH. was 82.04% and 40.92% respectively. The methanolic extracts of grape seeds and Hops leaves at 250 ppm gave the ability to protect linoleic acid from the oxidation process of 78.98% and 48.41%, respectively. The antioxidant activity values of the extracts were compared with standard samples of ascorbic acid and BHT.

References used

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