GSR and diabetes mellitus: MDA: Malondialdehyde; GSH: Reduced glutathione; GST: Glutathione-S-transferase; GR: Glutathione reductase; CAT: Catalase; SOD: Superoxide dismutase; GPx: Glutathione peroxidase; DM: Diabetes mellitus; SP: Scutellaria pinnatifida; Gly: Glibenclamide