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Considering the widespread use of oils in the preparation of foods, controlling the amount of ingredients in edible oils that can be problematic for human health is extremely important. Due to the complex matrix of oils, analysis of the different compounds in them is usually not possible without isolating and removing the matrix effects. In this regard, a variety of extraction and isolation methods are presented by researchers. Therefore, in this paper it has been tried to introduce in detail the most important extraction methods used in the analysis of edible oils and how they are applied.

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Milk fat, one of the expensive fatty matters, might be sometimes adulterated with other edible fats, particularly palm oil or its fractions, which can be a major problem for the dairy industry, especially in Iran. The aim of this study was to investigate the adulteration of milk fat based on some minor components present in unsaponifiable matters, namely, sterols and squalene. Different concentrations of palm oil and its fractions (0, 1, 2, 5, 10, 20, 50, and 100%) were added to pure milk fat. Sterol and squalene contents were determined by the application of GC and HPLC, respectively. The experimental data showed that β-sitosterol was the main phytosterol in palm oils and it could be a good indicator for detection of adulteration by palm oil as low as 5%. The result also indicated that squalene was not identified in milk fat, so, it can be considered as a good indicator to show the presence of palm oil as low as 1%. According to the results, it might be concluded that sterols and squalene could be used as important indicators to find the presence of palm oil and its fractions in milk fat.

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Healthy and pollution-free foods are very effective in maintaining body health. Among the foods that need to be monitored are falafel and edible oils that can be contaminated with dangerous substances such as acrylamide. In this study, falafel samples were prepared from 3 fast food restaurants in Tehran, and 3 types of common crude oils including sunflower, soybean and canola oils were selected from 5 top-selling brands, and sampling was done randomly. After preparation, these pollutants were evaluated by GC-MS. The average acrylamide in oil samples was 0.08±0.02 mg/kg, which was lower than the European :union: standard (500 μg/kg for fried potatoes and 100 μg/kg for bread). Among the three crude oils selected, soybean oil had the lowest amount of acrylamide (0.05±0.01 mg/kg) and sunflower oil had the highest amount of acrylamide (0.10±0.03 mg/kg). Also, the average amount of acrylamide in falafel samples was 1.80 ± 0.56 mg/kg, which is higher than the mentioned standards. According to the obtained results and since the amount of acrylamide contamination in the falafels available in fast food restaurants is slightly higher than the standards, it is necessary to carry out more monitoring in this field.