BACKGROUND: Nowadays essential oils with antioxidant properties are used in order to increase the shelf life of pre-cooked food. Objectives: This study was carried out to compare the effect of Cumin and three methods of cooking, frying, oven baking and steaming on oxidative changes of pre-cooked fillet of rainbow trout. Chemical (DPPH(1,1- Diphenyl- 2- picryl hydrazine) for Cumin and FFA (Free Fatty Acid), PV(Peroxide value), TBARS) ، Thiobarbituric acid reactive substances) and sensory indicators, were evaluated during  4 months storage at freezing temperatures. Methods: Fillet samples were treated with Cuminum cyminum EOs and BHT. The study was based on application of cooking methods, frying at 180° C for 4 min in sunflower oil, baked in the oven at 200 °C for 22 min and steamed at 200 °C for 22 min and oxidative changes were evaluated during the period of storage as frozen fillets. Results: The FFA formation showed increase in all groups, oven baked rainbow trout fillets gave the highest increase (P<0.05). The highest value of PV was obtained from fried fillets treated with C. cyminum EOs (4.92  ± 0.23 meq/kg). The TBARS values were not significantly different with fresh-raw fillet after cooking (P>0.05), but the treated samples with EOs generally showed slower oxidative changes than those of the untreated samples. Based on the sensory evaluation, fillet fried was found as a preferred cooking method and also, the additions of C. cyminum EOs have positive effect on sensory quality of baked rainbow trout. Conclusions: Differences in cooking methods includin frying, oven baking and steaming showed that rainbow trout fillet treated with C. cyminum EOs under the frying method are more desirable in terms of chemical changes and sensory analysis compared with the other treatments.

The present study was conducted to evaluate the effect of Cumin on diabetes mellitus induced by alloxan in rats. Male Wister rats were used, and randomly divided into five groups (6-8 rats for each group): The first group: was administered distilled water and served as normal control, the second group: induced diabetes by single subcutaneous injection of alloxan 100 mg/kg.body weight and served as diabetic control, the 3,4,5 groups was administered 50,100,200 gm/kg of rat's forage respectively for four weeks, then diabetes are induced in this groups by same route as above. Cumin treatment in all doses lead to significant decrease glucose levels, and triglyceride and significant decrease in cholesterol level in dose 100, 200 gm/kg of forage and no change occur in total protein level. These results indicate that cumin have a role in delaying of diabetes through the effects of cumin in decrease some biochemical parameters.

The present study was conducted to evaluate the effect of Cumin on diabetes mellitus induced by alloxan in rats. Male Wister rats were used, and randomly divided into five groups (6-8 rats for each group): The first group: was administered distilled water and served as normal control, the second group: induced diabetes by single subcutaneous injection of alloxan 100 mg/kg.body weight and served as diabetic control, the 3,4,5 groups was administered 50,100,200 gm/kg of rat's forage respectively for four weeks, then diabetes are induced in this groups by same route as above. Cumin treatment in all doses lead to significant decrease glucose levels, and triglyceride and significant decrease in cholesterol level in dose 100, 200 gm/kg of forage and no change occur in total protein level. These results indicate that cumin have a role in delaying of diabetes through the effects of cumin in decrease some biochemical parameters