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Oxidation of lipids in foods is one of the most important chemical events during food frying. The resulting chemical indices contribute to various diseases such as atherosclerosis, cancer, premature aging, respiratory distress syndrome and various liver disorders. The overall objective of this study was to investigate the chemical factors of the oils used in Fried falafels.
and then compared with the  case controlled conditions in the laboratory. This study was performed on 50 samples prepared in the shop. Peroxide, anisidine number, total oxidation value (TOTOX) and Kreis test were measured to investigate the destructive effect of falafel compounds on oil, then was compared with the case controlled samples according to the relevant standards in the laboratory. In this study, more than half of the samples could not be used and only 42% of the samples were approved. The mean and standard deviation for this values in the control sample were 4.39±0.62, 6.09±0.87 and 15.68±2.09 respectively. Also, there was a positive correlation between the values of peroxide, anisidine and TOTOX with Kreischr('39')s test. Based on the results, it was found that most of the chemical factors in the samples were above the permissible limit and used oils on the shops are unhealthy and unusable. Therefore, due to the dangers of primary and secondary oxidation on human health, implementation of training programs and application of the proper way to prepared food for the staff of these centers is essential.

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Nowadays, various forms of medicinal plants are used for different purposes such as improving the qualitative attributes, partial replacement of nitrite, and increasing the overall acceptance and shelf-life of meat products. In this research, 10, 20, and 30 mg/kg of Carum copticum extract, 40, 50, and 60 mg/kg of Salvia officinalis extract, and a combination extract (15:30) were used as partial replacements of nitrite in the sausage formulation. Then, the physicochemical, microbial  and sensory tests were performed on all treatments and control sample over 45 days. The results showed that treatment with 60 mg/kg S. officinalis extract had the lowest pH value. The lowest peroxide value was related to treatment with 40 mg/kg S. officinalis extract, which showed a significant difference with the control sample. In contrast, the lowest cooking loss was reported for treatment with 30 mg/kg C. copticum extract. The control sample showed the highest microbial count. Treatment with 60 mg/kg S. officinalis extract had the least total count of bacteria and C. perfringens. In contrast, the least count of coliform, mold, and yeast was found for treatment with 40 mg/kg S. officinalis extract. In terms of sensory attributes, treatment with 30 mg/kg C. copticum extract had the highest color and flavor scores, while the highest consistency and overall acceptance scores of all treatments were related to 20 and 10 mg/kg C. copticum extract, respectively. As a conclusion, treatment with various concentrations of S. officinalis extract had better acceptability and more effects on the sausage quality.