Abstract
The present study was to evaluate the protective effects of Rebaudioside A (Reb A) on antioxidant status and lipid profile in streptozotocin (STZ)-induced diabetic rats. Diabetes was induced in Wistar rats by a single intraperitoneal administration of STZ (40mg/kg b.w). Diabetic rats showed significantly increased levels of plasma glucose, thiobarbituric acid reactive substances, hydroperoxides and decreased levels of insulin. The activity of enzymatic antioxidants (superoxide dismutase, catalase and glutathione peroxidase) and the levels of non enzymatic antioxidants (vitamin C, vitamin E and reduced glutathione) were decreased in diabetic rats. The levels of total cholesterol (TC), triglycerides (TGs), free fatty acids (FFAs), phospholipids (PLs), low density lipoproteins (LDL-cholesterol) and very low-density lipoproteins (VLDL-cholesterol) in the plasma significantly increased, while plasma high-density lipoproteins (HDL-cholesterol) were significantly decreased in diabetic rats. Oral administration of Reb A (200mg/kg b.w) brought back plasma glucose, insulin, lipid peroxidation products, enzymatic, non-enzymatic antioxidants and lipid profile levels to near normal. The results of the present investigation suggests that Reb A, a natural sweetener exhibits antilipid peroxidative, antihyperlipidemic and antioxidant properties.
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