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    Durability of Wood Treated with Propolis
    (North Carolina State Univ Dept Wood & Paper Sci, 2020) Akcay, Caglar; Birinci, Emre; Birinci, Ceren; Kolayli, Sevgi
    Propolis is an important antifungal agent found naturally in beehives and used as a food supplement for many purposes. This study aimed to use methanolic propolis extract (MPE) as a treatment material as an antifungal agent for wood preservation. Scots pine and paulownia woods were exposed to Trametes versicolor and Neolentinus lepideus fungi for 12 weeks, and untreated woods were used as the controls. Compared with the control, paulownia wood exposed to N. lepideus had a 47.2% mean mass loss, while the treated wood with 7% MPE had an 11.6% mean mass loss. In addition, a 27.2% mass loss occurred with the control for Scots pine when exposed to N. lepideus, and a 2.5% mass loss occurred with the 7% propolis-treated specimens. Total phenolic content and the phenolic profile of the raw propolis samples were also analyzed. Scanning electron microscopy images showed that the propolis extracts still remained in the wood cells without being degraded after the fungal destruction and the propolis-treated specimens were more durable against fungal decay compared to the untreated control specimens. The results from this study indicated that propolis could be used as an environmentally compatible and natural wood preservative to protect wood against fungal attack.
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    Effects of Honey Bee Race and Season on Propolis Composition
    (2021) Kekeçoğlu, Meral; Keskin, Merve; Birinci, Ceren; Birinci, Esra; Kolaylı, Sevgi
    Honey bees collect the main material of propolis from the buds, leaves, branches, and barks or other botanical sources and mixed that resinous material with beeswax produced from abdominal exocrine glands, mandibular gland secretions, and pollen to produce propolis. The composition of propolis changes depends on multiple factors such as honey bee races, geographical locations, phytogeography, harvesting seasons, extraction methods and solvents. In this study, two different studies were conducted in two different locations in order to reveal the effect of race and season variables on the composition and antioxidant value of propolis. The effect of race factor was studied on three different honey bee races (Apis mellifera caucasica, Apis mellifera syriaca and Apis mellifera carnica) and two different ecotypes (Muğla ecotype and Yığılca ecotype) to investigate the effects of race factor on propolis composition in Central Anatolia by under the controlled conditions. The effect of seasonal change was determined by Yığılca ecotype of A. melifera anatoliaca in the apiary located in Yığılca, Düzce location. Studied samples were harvested by propolis trap between May and October. Total phenolic content, total antioxidant capacity and chemical profiles of propolis samples were determined using HPLC-UV. The obtained results showed that honey bee race and season have an effect on the antioxidant capacity and chemical composition of propolis.