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    Corn Oil Oleogel With ?-Oryzanol/?-Sitosterol: Structural, Thermal, Textural, and Oxidative Characterization
    (Wiley, 2026) Elbir Abca, Tugba; Genccelep, Huseyin
    In this study, a corn oil oleogel was prepared using gamma-oryzanol and beta-sitosterol to create a "healthier solid fat-like" structure aimed at reducing saturated and trans fat consumption. To prepare six different oleogels, a gamma-oryzanol:beta-sitosterol mixture (60:40) was added to corn oil at concentrations ranging from 6% to 15%. The samples were comprehensively evaluated in terms of oil-binding capacity and color; thermal behavior (including melting/crystallization properties); crystal structure; texture properties (hardness, stickiness, cohesion, and spreadability); molecular interactions and oxidative stability. The findings showed that all formulations had high oil binding capacity and that increasing the oleogelator concentration had a limited effect on oil binding. It has been determined that concentration plays an important role in the product's thermal resistance. Results show that as the oleogelator ratio increases, the structure becomes stronger and more durable; the melting behavior in thermal measurements shifts to higher temperatures. Crystal structure analyses support the formation of an oleogel network, while FTIR results indicate that the structure is formed predominantly through physical interactions. Consequently, it has been demonstrated that corn oil can acquire solid fat-like functional properties through this approach and offers a viable option for developing healthier fat formulations, particularly in spreadable products, margarine, and bakery fats.
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    Extraction of Bioactive Compounds from Celery Root Peels Using an Ultrasound-Assisted Method with Choline Chloride-Based Deep Eutectic Solvents
    (Springer, 2025) Kamiloglu, Aybike; Kutlu, Naciye; Elbir Abca, Tugba; Yilmaz, Ozlem
    The concepts of sustainable and green technology have come to the forefront due to problems such as increasing environmental pollution, depletion of resources, and uncontrolled increases in industrialization. Green chemistry aims to reduce or completely eliminate pollution in the environment. In this study, both the ultrasonic method, which is a form of green technology, and deep eutectic solvents, which are among green solvents, were used, and a perspective on creating economic value from a waste product (celery root peel) is presented. In this context, phytochemical compounds (total flavonoid content and antioxidant activities) were obtained from celery root peels by ultrasonic-assisted extraction using 10 different choline chloride-based deep eutectic solvents, and the results were compared with methanol, an organic solvent. As a result, according to the total flavonoid content, the most effective deep eutectic solvent was choline chloride to sucrose, while according to the antioxidant activity value, choline chloride to lactic acid was found to be effective. For all of the analyzed bioactive compounds, higher or equal yields were obtained with all deep eutectic solvent extracts compared to methanol, and deep eutectic solvents could be alternatives to organic solvents (such as methanol) that may have toxic effects on humans or the environment.