Determination of tocopherol contents of some olive varieties harvested at different ripening periods
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The tocopherol contents of oils obtained from Ayvalik, Domat and Gemlik olive varieties harvested at different ripening periods were evaluated by high-performance liquid chromatography. alpha-Tocopherol was the major tocol detected in all the studied olive oil samples. The oils extracted from olive fruits composed of 130.54-180.43 mgkg(-1) alpha-tocopherol, 0.73-1.61mg kg(-1) beta-tocopherol and 0.53-2.28mg kg(-1) gamma-tocopherol for Ayvalik oil. The alpha-, beta- and gamma-tocopherol contents of Domat oil are in the ranges 95.60-125.56, 0.71-2.70 and 0.49-1.25mg kg(-1) at different harvesting periods. The alpha-, beta- and gamma-tocopherol contents of Gemlik olive oil are in the ranges 112.59-168.19, 0.94-1.21 and 0.85-2.40mg kg(-1), respectively. There were significant differences between the oils from cultivars grown in different environments.