Maximize the Benefit from Date Pits for Production Activated Carbon and Using It for Removing Peroxides from Fried Oils

Abstract

Objectives: The present study was aimed at improving the quality of fried sunflower oil. Synthetic (Magnesol XL) natural (agriculture wastes of date industry) were used to absorb the oxidation products of fried sunflower oil. Study Design: Recycling of wastes (date pits). Place and Duration Study: Food Science and Nutrition Department, Faculty of Agricultural Science and Foods, King Faisal University, Saudi Arabia. Oils & Fats Research Department, Food Technology Research Institute, Agricultural Research Center, Giza, Egypt, between January 2012 and October 2013. Methodology: The mineral (Si, Mg, Ca, Fe, Al, Mn and Cu) of the aforementioned substances were determined. The physico-chemical properties of non-fried, fried and fried-treated sunflower oil were determined. The frying process was carried out at 180±5ºC for 16hrs, 4hrs heating per day for four consecutive days. The fried sunflower oil was treated with synthetic, natural and activated carbon of date pits at level 2%. A set of nutritional experiments was conducted in which rats administrated standard diets were containing non-fried, fried and fried–treated oils with adsorbent materials. The safety limits of the fried-treated oils were determined by measuring the activities of alanine aminotransferase (ALT), aspartate aminotransferase (AST) and alkaline phosphatatse (AP) and levels of total lipids, total cholesterol, HDL-cholesterol and LDL-cholesterol of rat sera. Results: The results indicated that Magnesol XL, diatomaceous earth and activated carbon of date pits contained Si + Mg + Si + Mn + Ca and Si +Mg + Ca as the basic metals, respectively. Frying of sunflower oil led to significant increase in physico-chemical properties. Treatments of fried sunflower oil with the aforementioned substances greatly improve the quality of fried oil. Also, the results highlight the potential effect of Magnesol XL, diatomaceous earth and activated carbon of date pits in improved rat liver (AST, ALT and AP) and levels of sera constituents were similar to those of rats given non-fried oils. Conclusion: The natural adsorbent material (diatomaceous earth) and activated carbon of date pits do not exhibit any harmful effects on humans and possess nearly the same adsorbing effects in removing oil oxidation products. In addition, they are cheap and are useful for regenerating the quality of fried oils.