title: Impact of dietary oils and fats on lipid peroxidation in liver and blood of albino rats.
abstract: OBJECTIVE
  To investigate the effects of different dietary fat and oils (differing in their degree of saturation and unsaturation) on lipid peroxidation in liver and blood of rats.
  
  
  METHODS
  The study was conducted on 50 albino rats that were randomly divided into 5 groups of 10 animals. The groups were fed on dietary butter (Group I), margarine (Group II), olive oil (Group III), sunflower oil (Group IV) and corn oil (Group V) for 7 weeks. After 12 h of diet removal, livers were excised and blood was collected to measure malondialdehyde (MDA) levels in the supernatant of liver homogenate and in blood. Blood superoxide dismutase activity (SOD), glutathione peroxidase activity (GPx), serum vitamin E and total antioxidant capacity (TAC) levels were also measured to determine the effects of fats and oils on lipid peroxidation.
  
  
  RESULTS
  The results indicated that no significant differences were observed in SOD activity, vitamin E and TAC levels between the five groups. However, there was significant decrease of GPx activity in groups IV and V when compared with other groups. The results indicated that feeding corn oil caused significant increases in liver and blood MDA levels as compared with other oils and fats. There were positive correlations between SOD and GPx, vitamin E and TAC as well as between GPx and TAC (r: 0.743; P<0.001) and between blood MDA and liver MDA (r: 0.897; P<0.001). The results showed also negative correlations between blood MDA on one hand and SOD, GPx, vitamin E and TAC on the other hand.
  
  
  CONCLUSIONS
  The results demonstrated that feeding oils rich in polyunsaturated fatty acids (PUFA) increases lipid peroxidation significantly and may raise the susceptibility of tissues to free radical oxidative damage.
authors.affiliation: Department of Medical Biochemistry and Physiology, College of Medicine, Qassum University, Kingdom of Saudi Arabia.
authors.forename: Mohammad El-Sayed Yassin El-Sayed
authors.initials: Mel-S
authors.lastname: Haggag
authors.forename: Rafaat Mohamed
authors.initials: RM
authors.lastname: Elsanhoty
authors.forename: Mohamed Fawzy
authors.initials: MF
authors.lastname: Ramadan
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D004032:Diet; D004041:Dietary Fats / Q000494:pharmacology*; D004042:Dietary Fats, Unsaturated / Q000494:pharmacology; D005260:Female; D005979:Glutathione Peroxidase / Q000097:blood; D015227:Lipid Peroxidation / Q000187:drug effects*; D008297:Male; D008315:Malondialdehyde / Q000097:blood; D010938:Plant Oils / Q000494:pharmacology*; D051381:Rats; D013482:Superoxide Dismutase / Q000097:blood
chemical_list: D004041:Dietary Fats; D004042:Dietary Fats, Unsaturated; D010938:Plant Oils; D008315:Malondialdehyde; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase
keywords: Butter; Glutathione peroxidase activity (GPx); Lipid peroxidation; Malondialdehyde (MDA); Margarine; Polyunsaturated fatty acids (PUFA); Superoxide dismutase activity (SOD); Vegetable oils