Huseyin KARA, Hamide Filiz AYYILDIZ, Mustafa TOPKAFA, Syed Tufail Hussain SHERAZI, Sarfaraz Ahmed MAHESAR

Bazı Ticari Soğuk Pres Yağların Kimyasal Özelliklerinin ve Oksidatif Kararlılığının İncelenmesi

Bu çalışmada, soğuk pres keten tohumu, çörek otu, kabak çekirdeği, ceviz ve haşhaş tohumu yağlarının kimyasal bileşimi ve oksidatif stabilitesi incelenmiştir. Sonuçlar, çekirdek yağlarının kayda değer miktarlarda doymamış yağ asitlerini içerdiğini (% 79'un üzerinde), bunlar arasında ise çoklu doymamış yağ asitlerinin, özellikle de linoleik asitlerin, kabak çekirdeği yağı hariç diğer yağlardaki toplam yağ asidi miktarının % 53.24 ile % 71.37'si arasındaki değerlerde baskın olduğunu göstermiştir. Yağların tokol içeriği ~ 490-932 mg kg-1 arasında bulunmuş ve deney koşullarındaki en yüksek toplam tokoferol düzeyi (977.47 mg kg-1 ) keten tohumu yağında tespit edilmiştir. En yüksek PV değeri ceviz yağında rapor edilmiş (2.81 meq O2 kg-1 ), en yüksek FFA içeriği ise keten tohumu yağında (%1.82) bulunmuştur. OSI değerleri; keten tohumu, çörek otu, kabak çekirdeği, ceviz ve haşhaş tohumu yağları için sırasıyla 4.15, 3.57, 4.31, 3.98 ve 4.92 saat olarak tespit edilmiştir. Elde edilen veriler, bu çalışmadaki tohum yağlarının özel diyet kaynakları olarak kullanılabileceğini göstermektedir.

INVESTIGATION OF THE CHEMICAL CHARACTERISTICS AND OXIDATIVE STABILITY OF SOME COMMERCIAL COLD-PRESSED OILS

In this study, the chemical composition and oxidative stability of cold-pressed flaxseed, black seed, pumpkin seed, walnut seed, and poppy seed oils were examined. The results showed that the seed oils contained appreciable amounts of unsaturated fatty acids (above 79 %). Polyunsaturated fatty acids, particularly linoleic acids were dominant, with values ranging from 53.24 % - 71.37 % of the total amount of fatty acids except for pumpkin seed oil. Tocols content was found to be between ~ 490-932 mg kg-1 , and the flaxseed oil exhibited the highest levels of total tocopherols (977.47 mg kg-1 ) under the experimental conditions. While, the highest PV was found in walnut seed oil (2.81 meq O2 kg-1 ), and the highest content of FFAs was reported for flaxseed oil (1.82 %). OSI values were 4.15, 3.57, 4.31, 3.98 and 4.92 h for the flaxseed, black seed, pumpkin seed, walnut seed, and poppy seed oils, respectively. The obtained data suggest that the seed oils in this study may serve as special dietary sources.

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