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Semecarpus anacardium  Linn. ( Family:  Anacardiaceae), commonly known marking nuts has been used in various traditional system of medicines for various ailments (such as antiatherogenic, antiinflammatory, antimicrobial, hypoglycemic, anticarcinogenic etc) since ancient times.Based on the wide pharmacological activities of this plant, the present study was aimed to explore the antioxidant and antihyperlipidemic potential in high fat diet fed rats using catechol derivatives I–IV and biflavonoid isolated from seeds of  Semecarpus anacardium . Oral administration of catechol derivatives I–IV and biflavonoid at a concentration of 50 mg/kg b.wt to high fat diet fed rats for a period of 30 days significantly decreased the lipid profiles, body weight gain and organ weight when compared to untreated hypercholesterolemic rats. However, biflavonoid treated hypercholesterolemic rats showed more pronounced effects in all the parameters tested when compared to all catechol derivatives (I–IV) treated hypercholesterolemic rats. The effect produced by biflavonoid on various parameters was comparable to that of simvastastin- a standard drug. In vitro antioxidant activities were also conducted using these five compounds in which biflavonoid showed more significant antioxidant potential at a concentration of 1000 µg/ml when compared to catechol derivatives (I–IV). The pronounced antioxidant potential of biflavonoid might have contributed to the hypolipidemic action in hypercholesterolemic rats and improved oil red O staining of thoracic aorta has also supported the parameters investigated. Further, the molecular mechanism of cholesterol lowering potential of this drug is needed.

Antioxidant and antihyperlipidemic activities of catechol derivatives and biflavonoid isolated from Semecarpus anacardium seeds