Yazar "Ates, Kivilcim" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Encapsulation of carvacrol in (3-cyclodextrin metal-organic frameworks: Improved solubility, stability, antioxidant capacity and controlled release of carvacrol
    (Elsevier Sci Ltd, 2025) Ates, Kivilcim; Yildiz, Zehra Irem
    Carvacrol, a phenolic compound found in oregano and thyme, exhibits potent antioxidant activity and is commonly utilized in food applications due to its flavor and fragrance, as well as its capacity to inhibit oxidation and prolong shelf life. However, its application is limited by its low water solubility, low stability and high volatility. This study examines the encapsulation of carvacrol within edible and porous materials, namely cyclodextrin metal-organic frameworks (CD-MOFs), as a means of enhancing its properties. In the present study, (3-CD-MOFs were synthesized with varying amounts of carvacrol. The encapsulation efficiency was observed to vary with the ratio of carvacrol to (3-CD-MOF, with an improvement in efficiency achieved at higher ratios up to a point, reflecting the capacity of the (3-CD-MOF to encapsulate carvacrol molecules effectively before reaching saturation. Morphological examination and X-ray diffraction (XRD) revealed significant structural alterations in the (3-CD-MOF following the loading of carvacrol. Fourier-transform infrared (FTIR) spectroscopy served to confirm the successful encapsulation, as evidenced by alterations in the bonding patterns. Thermal analysis revealed shifts in degradation temperatures and the absence of the boiling point peak of carvacrol in carvacrolloaded (3-CD-MOFs (Car/(3-CD-MOFs), indicative of successful encapsulation and enhanced thermal stability. The antioxidant capacity of carvacrol was found to increase significantly upon encapsulation within (3-CD-MOFs, as evidenced by antioxidant assays. Solubility and release profile studies demonstrated an improvement in the dissolution and controlled release behavior of carvacrol. These findings collectively highlight the potential of (3-CD-MOFs as effective carriers for enhancing the functional properties and applications of carvacrol.
  • Küçük Resim Yok
    Öğe
    Growth performance of Scenedesmus sp. AQUAMEB-57. Ankistrodesmus sp. AQUAMEB-33, and Synechococcaceae AQUAMEB-32 cultivated at different light intensities
    (Taylor & Francis Ltd, 2025) Uguz, Seyit; Anderson, Gary; Simsek, Ercan; Ates, Kivilcim; Yilmaz, Mete; Yaslioglu, Erkan; Ulusoy, Yahya
    Increasing air pollutants significantly contributes to climate change, requiring innovative mitigation strategies. Microalgae provide a promising solution by absorbing CO2 and pollutants like nitrogen oxides (NOx), sulfur oxides (SOx), and ammonia from agricultural and industrial emissions, while also generating biomass for biofuels and animal feed. This study investigated the effects of light intensity on the growth and biochemical composition of Scenedesmus sp. AQUAMEB-57, Ankistrodesmus sp. AQUAMEB-33, and Synechococcaceae AQUAMEB-32 cultivated in photobioreactors under two batch and continuous culture conditions. Scenedesmus sp. reached the highest cell concentration (8 x 106 cells ml-1) at 200 mu mol photons m-2s-1, while Ankistrodesmus sp. and Synechococcaceae peaked at 300 mu mol photons m-2s-1. Dry biomass was highest for all species at 300 mu mol photons m-2s-1. Scendesmus sp showed the highest protein content (15.6%) at a light intensity of 200 mu mol photons m-2s-1, Ankistrodesmus sp. (17.2%) at 300 mu mol photons m-2s-1, and Synechococcaceae (23.5%) at 100 mu mol photons m-2s-1. Maximum carbohydrate content for Scenedesmus sp., Ankistrodesmus sp., and Synechococcaceae was 56.0%, 20.5%, and 18.4%, respectively, at 300 mu mol photons m-2s-1. C16/C18 fatty acids significantly increased as light intensity was raised from 100 to 200 mu mol photons m-2s-1. The findings show that light intensity impacts growth rates and biochemical profiles, varying by species and cultivation mode. Continuous systems yield higher biomass than batch systems, emphasizing the need for optimized strategies to enhance algal productivity. This research enhances understanding of microalgal growth dynamics, offering insights into optimizing conditions for improved biomass yield and supporting sustainable biofuel production and other valuable products.