Determination of chemical properties and some oil acid compositions of some centaurea and onopordum seeds grown around Van

In this study, fatty acid composition, tocopherol contents, peroxide numbers, free acidity and color values of seed oils were compared by determining the fat content, total phenolic contents, volatile components, antioxidant activities and some characteristics of Centaurea albonitens (CA), Centaurea balsamita (CB), Onopordum anatolicum (OA) and Onopordum heteracanthum species. The oil contents of CA, CB, OA and OH seeds were found to be 17.65%, 19.36%, 15.84% and 12.54%, respectively and total phenolic contents of the seeds were found to be in the range of 9019-18554 mg-GAE / kg-KM. In the obtained seed oils, it has been determined that linoleic acid varies between 38.09 and 49.94%, oleic acid in the range of 22.07-30.36%, palmitic acid 8.98-10.64% and stearic acid 5.70-7.56%. In addition, a significant amount of α-tocopherol (1066-1698 mg / kg) was detected in fats other than OH. 22, 26, 17 and 17 volatile compounds were detected in the seeds of CB, CA, OA and OH, respectively. DPPH (% inhibition) values in the studied seeds were determined as in the range of % 26.60-84.41 and ABTS values were determined between 46.90-121.18 mmol Trolox equivalent / g-KM. In the light of all these findings, it was concluded that the seeds of CA, CB, OA and OH can be considered as alternative oil raw materials, and that the studied seeds can be used as natural antioxidant and polyunsaturated fatty acids sources in the formulation of functional foods.