Abstract
The present study was proposed to assess the in vitro free radical-scavenging activity of B. diffusa methanolic extract (BDME) and its modulatory effect against streptozotocin (STZ) induced diabetes in male Wistar rats. Experimental diabetes was induced in Wistar albino rats by administering single dose of STZ 40 mg/kg. One week later rats with blood glucose level >200 mg/dL were segregated as diabetes in three groups each containing 6 rats in number. Total phenolic content in B. diffusa methanol extract (BDME) was found to be 87 mg of gallic acid equivalents/g extract and total flavonoid content found to be 54.1 mg of quercetin equivalents/g extract. Its extract also exhibited DPPH (IC50, 163.1±6.7 μg/mL), nitric oxide (295 μg/mL) and H2O2 (159±5.25 μg/mL) radical scavenging activity. Pre-treatment with BDME (100 and 200 mg/kg b.w.) in streptozotocin-induced diabetic rats resulted in significant improvement in blood glucose, blood plasma enzymes SGOT, SGPT and ALP, weight loss, total protein, serum insulin and liver glycogen levels. Furthermore, it restores the activity of antioxidant enzymes viz. SOD, CAT and GPx. Thus, the result suggests that BDME employed significant anti-diabetic effect in Wistar rats which is associated with its free radical scavenging and antioxidant activity.
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