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Olive Leaf Juice Could Be Edible Oil Antioxidant

Olive juice, obtained by pressing olive leaves, may act as an antioxidant to prolong the frying life of frying oils, suggests a study using sunflower oil. //

"The outcome of the present study suggests that crude olive juice can be used in practical operation to extend the frying life of frying oils," wrote lead author Radwan Farag from Cairo University.

The use of natural alternatives to synthetic preservatives, such as like butylhydroxyanisole (BHA) and butylhydroxytoluene (BHT), to slow down the oxidative deterioration of food is gaining interest.

According to a 2003 report by Frost and Sullivan, the synthetic antioxidant market is in decline, while natural antioxidants, such as herb extracts, tocopherols (vitamin E) and ascorbates (vitamin C) are growing, pushed by easier consumer acceptance and legal requirements for market access.

This natural antioxidant range could potentially include the polyphenol-rich extract from olive leaves, suggests new research published in the International Journal of Food Science and Technology.

The Egyptian researchers compared the antioxidant performance of 400, 800, 1600, and 2400 ppm of olive polyphenols with BHT (200 ppm) on the stability of sunflower oil under heating conditions (180 degrees Celsius, five hours per day for five days).

Measures of physical and chemical characteristics as a result of adding the antioxidant ingredients showed that no significant effect on the colour of the oil occurred by addition of any level of olive polyphenols. The formation of peroxides in the oil as a result of heating also decreased with increasing olive juice concentration, said the researchers.

"In fact, the peroxide value of the heated sunflower oil mixed with 2400 ppm of polyphenolics at the end of the heating process was about 11.3, 9.2, 2.8 and 11.4 times lower than that of the sunflower oil mixed with 400, 800, 1600 and control, respectively," they w
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