Browsing by Author "Taymaz, ER"

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    Innovations in biocompatible materials: exploring the potential of cellulose nanocrystals from grape pomace
    Taymaz, ER; Uslu, ME
    This study investigates the extraction and isolation of cellulose nanocrystals (CNCs) from grape pomace, an agricultural waste material abundant in phenolic compounds. The process involves organic isolation, alkaline bleaching at various concentrations, and acid hydrolysis to obtain pure cellulose and CNCs. Structural analyses using XRD, FTIR, and TGA reveal critical insights. Comparison with existing research on CNCs derived from other biomass sources, such as Siam weed, highlights similarities in the preparation method and structural confirmation through FTIR analysis. TGA results demonstrate the higher initial decomposition temperature of cellulose from grape pomace compared to unprocessed pomace, showcasing improved thermal stability after chemical purification. In TGA analysis because of high crystal content, 3% NaOH/H2O2 alkaline isolation exhibits the lowest water weight loss among all samples. Observations on crystallinity index variations in CNCs attribute these changes to alterations in alkali isolation concentration, corroborated by previous studies. The success of organic and alkaline isolations underscores the effectiveness of these methods in obtaining cellulose from grape pomace. The obtained cellulose and CNCs exhibit high potential in biomaterial applications. This study elevates the value of grape pomace from a disregarded waste product to a valuable source of cellulose for diverse applications in biomaterials, food, and bioprocess. Furthermore, the exploration of CNCs from grape pomace in natural packaging coatings and drug carrier systems opens new avenues for their utilization. In conclusion, the study emphasizes the overlooked potential of grape pomace and establishes the significance of cellulose extracted from this source, suggesting a promising future in various industries.
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    Investigation and Determination of the Presence of Resveratrol in the Leaves of 99 Grapevine Varieties from the Western Anatolia Region in Turkey
    Taymaz, ER; Uslu, ME
    Grapevine (Vitis vinifera L.) is one of the main plants of economic importance in the world. The development and adaptation of this plant, which is of great importance economically, to have the desired characteristics, is of great importance. The plant is an extremely important resource not only in terms of its fruit, but also because of the presence of secondary metabolites contained in its cellular structure. One of these secondary metabolites is resveratrol. Resveratrol is a metabolite synthesized in high amounts in grapevine, leaf and grape bark. The aim of the study was to determine the amount and content associated with phenolic content of 99 grapevine varieties protected in the Aegean region in Turkey. Our specific goal with this study was to determine an important parameter for Plant Breeding with data obtained as a result of using ultra-high performance liquid chromatography (HPLC) for the first time in grapevine varieties of the Aegean region. As a result of the analysis, the amount of resveratrol varies between 0-90 mg/kg. At the same time, the total phenol amount analysis was performed to determine the phenolic amount between grapevine types. Compared to plants capable of producing resveratrol, processed or fresh products of the vine are known to be widely consumed by a very large audience. For this reason, it reveals the importance of breeding studies to increase the content of resveratrol.