Rheological Properties for Olive Oil in Palestine

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Ahmad Mustafa Bahti

In this study, olive oil samples of different storage ages and regions in Palestine were studied. The density, refractive index, acidity and viscosity of the samples were measured. The refractive index of the olive oil samples were studied against storage ages and results showed that the refractive index decreases as a function of storage age. The acidity of olive oil samples from different regions and different crops showed that acidity increases as a function of storage age. Most of olive oil samples (storage age ≤ 12 years) acidity did not exceed the international quality standards (< 3.3%). It is worth noting that olive oil can be stored until 12 years without exceeding the international quality standards of acidity in proper conditions. The viscosity of olive oil samples of 2012 crop from different regions was studied, and the results showed that most of the olive oil samples are classified to be extra - virgin. Two and three constant equations were proposed to obtain more suitable prediction of temperature dependence of dynamic viscosity of olive oil. The experimental results of viscosity were compared with the power law equation, and the behavior of olive oil was found to be Newtonian

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