ABSTRACT
Background: Reactive oxygen species (ROS) may cause extensive tissue damages in various disease conditions.It may also induce an irreversible structural and/or functional modification of proteins. Flavonoids and theirderivatives are the largest group in plant polyphenols that are known to have an antioxidant effect. The aim ofthe present study is to evaluate the antioxidant effects of red or white cabbage on bovine serum albumin (BSA).Methods: Fresh leaves of red or white cabbage were washed with distilled water, and sliced into small pieces.Finally, the pieces were dried and extracted with 80% ethanol overnight. The antioxidant activity of cabbageextracts were studied by ferric reducing antioxidant power (FRAP) and H2O2 scavenging assays. Statisticalanalysis: Statistical significances were analyzed by one-way analysis of variance (ANOVA) by using software Rversion 2.8.1 (R Development Core Team, 2008). Significant differences (p < 0.05) are denoted by differentletters. Results: Red and white cabbage extract showed a pronounced antioxidant activity. White cabbageexhibited a highest antioxidant activities compared to red cabbage extract. Conclusion: Both red and whitecabbages have a high antioxidant effects. White cabbage extract had higher antioxidant activity than red cabbageextract.
ABSTRACT
Diabetes mellitus has become the most prevalent metabolic disease worldwide. The edible leaves of Red cabbage(Brassica oleracea L.) is one of the most regularly consumed vegetables in Arabic countries. Thus, it was ofinterest to assess the hypoglycemic and hypolipidemic impacts of ethanolic (50 %) extract of the leaves of redcabbage on blood glucose, glycated hemoglobin (HbA1c) and lipid profile in streptozotocin (STZ)-induceddiabetic rats. Diabetes was induced in male Wistar rats by injecting rats with 60 mg/Kg bodyweight ofstreptozotocin. Diabetic rats demonstrated a significant increase in serum glucose, glycated hemoglobin (HbA1c)total cholesterol (TC), and triacylglycerol (TG). Daily oral supplementation (250 mg/Kg body weight) of extractof red cabbage leaves for 40 days to STZ-induced diabetic rats significantly ameliorated HbA1c (p < 0.01), TG(p < 0.01), serum glucose (p < 0.01), and TC (p < 0.01). By comparison, a standard anti-hyperglycemic drug,Glibenclamide, when administered at a dose of 10 mg/kg body weight, decreased TC, blood glucose, HbA1c, andTGs levels. It is concluded that the ethanolic extract of red cabbage decreased the blood levels of HbA1c, glucose,and lipids and it was more efficient than Glibenclamide in reducing blood glucose.