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Plant leaves are a great source of bioactive materials that are utilized in various food applications due to their functional properties (Bernhoft, 2010). In this context, the antiradical activities of leaf extract of several plants such as olive leaves (Andrikopoulos, Salta,

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Recently, there has been a growing interest in the use of natural antioxidants instead of synthetic ones. The aim of this work was to determine the effect of ginkgo and ginseng dried extracts as natural antioxidants on the stability of lipids in breadsticks over 55 days of storage at room temperature compared to butylated hydroxytoluene. Ginkgo and ginseng dried extracts were incorporated individually into breadstick formulae at levels of 0.5 and 1% to enhance its oxidative stability in storage. The increases in peroxide, p-anisidine and Totox values in the oil phase of the samples during storage were monitored. The changes in hydroperoxide, trans fatty acid and aldehyde contents were investigated by Fourier transform infrared spectroscopy. The sensory analysis was performed to evaluate the perceptible changes occurring during storage. The results indicated that the oxidation of oil in breadstick samples can be retarded by enriching the breadstick formula with dried ginseng extract at a 1% level.

Six varieties of bleaching agents: Commercial, Engelhard and Tonsil bleaching earth, magnesium oxide, aluminum oxide and charcoal were selected to evaluate their abilities on reducing color and gossypol content of color fixed neutralized cottonseed oil. Color of this oil was higher than 50 red units / 20 yellow using Lovibond Tintometer and 1 inch cell and its gossypol content was 200 ppm . The bleaching of the color fixed cottonseed oil was carried out by using two methods, conventional method (stirring oil with bleaching earth), and passing the oil on column filled with bleaching adsorbents. The aluminum oxide showed a superior adsorption capacity in reducing color to less than 1.4 red/20 yellow and reducing the gossypol content to 21 ppm, by using the column system. The conventional method failed to reduce the color of the treated samples therefore, alkaline pretreatments were conducted. The treatment of color fixed oil with alkaline solution (sodium hydroxide solution 14.5 Be o or sodium silicate at 45 Be o ) followed by conventional Engelhard bleaching earth treatment reduced the color of oil to values lower than 1.4 Red/20Yellow.