Estimation of flavonoids and screening of in vitro antioxidant activity of various extracts of aerial parts of Blepharis maderaspatensis by hydroxyl radical and total antioxidant activity

Abstract

Antioxidants are substances that hamper or inhibit the oxidation of oxidizable substrates in the cells. The aerial parts of Blepharis maderaspatensis dry powder was extracted with various solvents (PE, EA and methanol) through Soxhlet extractor. The aerial parts of different concentrates (Pet.ether, ethyl acetate and methanol) of Blepharis maderaspatensis was evaluated for its in-vitro antioxidant potential by hydroxyl radical, total antioxidant activity taking ascorbate used as standard for the both methods and total flavonoids content was estimated as equivalent to rutin. The methanolic concentrates of Blepharis maderaspatensis & standard exhibited antioxidant potential possessing IC50 210µg/ml & 62µg/ml (hydroxyl radical) 200µg/ml & 57µg/ml (Total antioxidant activity) respectively. An IC50 value was originate that methanolic concentrates of Blepharis maderaspatensis more efficient in hydroxyl radical, total antioxidant activity compared EA & PE concentrates. The methanolic and EA concentrates of Blepharis maderaspatensis showed the total flavonoids content (11.230±0.22 and 2.858±0.56 mg of rutin equivalent/g of powder) respectively. The difference in scavenging potential of the extracts can be due to variation in the percentage of bioactive compound flavonoids present in methanolic extracts. Invitro antioxidant studies obviously show methanolic concentrates of Blepharis maderaspatensis have better antioxidant activity due to the presence of total flavonoids content. The findings from the study reveal that the antioxidative potentials of methanolic concentrates Blepharis maderaspatensis could serve as free radical inhibitors, possibly acting as natural antioxidants.