Flavonoids of enhydra fluctuans exhibits analgesic and anti-inflammatory activity in different animal models

ABSTRACT

Enhydra fluctuans [Compositae], an edible semi aquatic herbaceous vegetable plant, widely used in traditional system of Indian medicine. Total flavonoids of E. fluctuans [TFEF] were screened for analgesic and anti-inflammatory activity. Analgesic activity was studied in acetic acid induced writhing response and by hot plate method in Swiss albino mice. Anti-inflammatory activity was estimated by carrageenan and histamine induced acute inflammation and Freund's complete adjuvant [FCA] induced chronic inflammation in rats. Two flavonoids, baicalein 7-O-glucoside and baicalein 7-O-diglucoside, were isolated from the ethyl acetate fraction. Oral administration of TFEF at the doses of 200 and 400 mg/kg provide 27.05 and 55.49% protection respectively in acetic acid induced writhing method. It also increased the pain threshold in mice evidenced by hot plate method. TFEF showed more potent anti-inflammatory activity. The results of this study may be attributed to high free radical scavenging and antioxidant potential of the flavonoids present in ethyl acetate fraction of Enhydra fluctuans