Browsing by Author "Basturk, A."

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3-Mcpd and Glycidol Levels in Edible Oils and Fats Obtained From Local Markets in Turkiye
(Consejo Superior investigaciones Cientificas-csic, 2023) Gunduz, A. O.; Ceylan, M. M.; Basturk, A.
In this study, it was aimed to determine the 3-MCPD and glycidol levels in 9 types (46 brands) of edible fat and oil offered for sale in markets located in Turkiye. 3-MCPD and glycidol levels were determined by making some modifications to the DGF C VI 18 (10) method. The highest levels of 3-MCPD and glycidol levels were detected in hazelnut oils, riviera olive oils, margarines, and shortenings. As expected, these contaminants were not observed in extra-virgin olive oils, while they were detected at low levels in fish oils. The highest 3-MCPD levels were found in the range of 0.06-2.12 mg & BULL;kg-1 in hazelnut oil, 0.16-1.69 mg & BULL;kg-1 in riviera olive oils, and 0.17-1.17 mg & BULL;kg-1 in margarines. The highest glycidol levels were found in the shortenings in the range of 1.98-6.46 mg & BULL;kg-1, followed by hazelnut oil (0.54-2.63 mg & BULL;kg-1) and riviera olive oil (0.19-3.53 mg & BULL;kg-1).
Antioxidant Activity, Volatile Compounds and Fatty Acid Compositions of Cephalaria Syriaca Seeds Obtained From Different Regions in Turkey
(Consejo Superior investigaciones Cientificas-csic, 2020) Kavak, C.; Basturk, A.
Crude oil yield, fatty acid composition, volatile compounds, antioxidant activity and some characteristics of Cephalaria syriaca seeds collected from different locations in Turkey were studied. Antioxidant capacity was determined by DDPH and ABTS tests and the results were in the range of 18.8-67.3% and 0.0-41.8 mmol Trolox eq g(-1) DW, respectively; while total phenolic contents were between 4339-11907 mg GAE kg(-1). The average alpha-tocopherol content was found to be in the range of 54-467 mg kg(-1). Oil yield was between 11.2-24.0%. Oleic and linoleic acids were the predominant fatty acids. A total of 30 different volatile compounds were identified in the samples, mostly consisting of alcohols and aldehydes. The results of this study showed that Cephalaria syriaca seeds can be considered as alternative raw material in the production of edible oil, and can be used as a source of natural antioxidants and food additives.
Effects of Ascorbyl Palmitate and Metal Ions on Oxidation of Sunflower Oil Under Accelerated Oxidation Conditions
(Pakistan Agricultural Scientists Forum, 2017) Basturk, A.; Boran, G.; Javidipour, I.
In this study, oxidative stability of sunflower oil was studied under accelerated oxidation conditions. First, refined commercial sunflower oil was examined for its composition of fatty acids and tocopherols. Then, oil samples were prepared with Fe+2 and Cu+2 ions (0, 0.15 and 0.3 mg/kg) and ascorbyl palmitate (0, 200 and 400 mg/kg). Oil samples were kept at different temperatures (30, 50 and 70 degrees C) for 20 days. Oxidation parameters including peroxide value, malonaldehyde concentration and hexanal content were periodically followed during the storage to investigate the effects of metal ions and ascorbyl palmitate on oxidation of sunflower oil. Results showed that temperature had significant effects on elevation of all oxidation parameters studied (P<0.05). It was also found that the concentrations of metal ions and ascorbyl palmitate significantly affected the oxidation of sunflower oil. Addition of 400 mg/kg ascorbyl palmitate restricted increment of peroxide value in both Fe2+ and Cu2+ added samples. While Fe2+ significantly increased the hexanal content, the presence of Cu2+ increased both hexanal and malonaldehyde values in sunflower oil during oxidation. In samples held at lower temperatures, the hexanal content was almost steady but dramatically increased at higher temperatures. It is concluded that hexanal content could be well considered as an indicator of oil oxidation along with malonaldehyde concentration.
Effects of Microwave and Conventional Heating on the Oxidative Stability of Corn Oil Enriched With Different Antioxidants
(Consejo Superior investigaciones Cientificas-csic, 2019) Basturk, A.
Four different corn oil samples including stripped (SCO, Control), refined (RCO), stripped corn oil enriched with rosemary extract (SCO+ROS) and ascorbyl palmitate (SCO+AP) were exposed to microwave (MWH) and conventional heating (CVH). For both heating methods, peroxide value (PV) and conjugated dienes increased at up to 230 degrees C, at which temperature hexanal (HEX) and conjugated trienes started to increase instead. Kinetic analysis revealed that PV and HEX formation were first ordered and the reaction rate among the samples was as follows: Control > SCO+ROS > RCO > SCO+AP for PV and SCO+ROS > RCO > SCO+AP > Control for HEX. The unsaturated fatty acid contents of CVH and MWH treated samples showed 9.5 and 12.9% reduction in SCO, while they were 2.9 and 7.7% in RCO, 3.6 and 6.1% in SCO+ROS, and finally 4.0 and 4.8% in SCO+AP. It was concluded that MWH led to a more severe deterioration and that the antioxidant activity of ROS was superior to that of AP for both heating methods.