The comparison of properties of the oil and kernels of various hazelnuts from Germany and Turkey

The oil yields of hazelnut kernels collected from Germany (Munster) and Turkey range from 8.1 to 64.1%. The main fatty acids in hazelnut kernel oils are oleic (76.382.6%), linoleic (6.514.0%), and palmitic (5.76.5%). The hazelnut kernel oils contained an appreciable amount of a-tocopherol (19.963.9?mg/100?g), with a mean value of 40.02?mg/kg, and ?-tocopherol (1.315.5?mg/100?g), with a mean value of 4.84. a-Tocopherol was the predominant tocopherol in all hazelnut kernels. The major sterols were beta-sitosterol, ranging from 78.13 to 82.56?mg/kg; campesterol, ranging from 4.79 to 7.42?mg/kg; and d5-avanasterol, ranging from 1.26 to 5.24?mg/kg. The highest minerals were K and P followed by Ca, Mg, Na, and Zn. P contents of all samples were established between 2029.90 and 4376.66?ppm. The results may also be useful for the evaluation of nutritional information. As a result, the present study showed that the kernels of hazelnut are a potential source of valuable oil which might be used for food and non-food applications. In addition, hazelnut kernel oil has a high nutritive value and can be recommended for processing of healthy food products.