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    Evalution of fatty acid compositions and physicochemical quality parameters of ancient and recent olive (Olea europaea L.) oil varieties of Southeast Anatolia
    (2018) Erdogan, Selim; Ugur, Yilmaz; Avcı, Halim
    Abstract: Upper Mesopotamia is known to be the homeland of olive, spanning over Mardin, Hatay, Kilis and the western shores of Syria and Palestine. Having earliest habitation in the Southeastern Anatolia region, olive lies down along the Western Anatolia. The goal of the present study is to evaluate the fatty acid compositions of the olive oils obtained from the olive trees which are the kinds of Kilis yağlık (KY), Halhalı (H), Gemlik-Kilis (GK), and Gemlik-Gemlik (GG). While GG variety has the lowest total saturated fatty acids (SFAs), KY, GK and H varieties show similarity in respect to the total SFAs levels, and these have the higher SFAs levels. While GG variety has the lowest total SFAs and polyunsaturated fatty acids (PUFAs), KY contains the highest total SFAs and PUFAs. While mean docosahexaenoic acid (DHA) values in KY and GK varieties are minor levels, it is found below the detection limit of GC-FID method for all of H and GG samples.
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    INVESTIGATION OF MELATONIN CONTENT AND ANTIOXIDANT CAPACITY IN GRAPE BERRIES
    (2021) Ugur, Yilmaz
    Abstract: In this study, six berry fruits; goji berry/wolfberry (Lycium barbarum), black mulberry (Morus nigra), white mulberry (Morus alba), blackberry (Rubus fructicous L.), purple mulberry (Morus rubra) and Bursa Black mulberry (unknown) were analyzed by HPLC-FD to determine whether they present melatonin. The melatonin was detected different amounts in all samples. Besides, the total phenolic content and antioxidant capacity were studied in all fruit samples. DPPH and ABTS tests were applied to determine the antioxidant capacity. It was observed that the amount of melatonin in the fruit samples varied between 123.44 and 1600.48 ng/gFW. It was found that the concentration of melatonin in goji berry (BF1) was higher than other berry fruits. The highest total phenolic content and antioxidant capacity to were obtained from purple mulberry (BF6) as 276.83 mg GAE/100 gFW, 452.38 mg TE/100 gFW (DPPH) and 555.73 mg TE/100 gFW (ABTS), respectively. Results reveals a significant positive correlation between the total phenolic content with antioxidant capacity.