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    Aroma, Aroma-Active, and Phenolic Compounds of Roselle
    (Elsevier, 2021) Selli, S.; Güçlü, G.; Sevindik, Onur; Kelebek, H.
    Roselle (Hibiscus sabdariffa L.) is an edible flower belonging to the large family Malvaceae. The dried calyx of roselle is utilized in different types of food and beverage production for its rich aroma content, color, and bioactive components. More than 200 aroma compounds have been identified in the roselle aromatic extracts. These compounds are an important quality indicator of roselle because of the effect on consumer acceptance and preference. Roselle calyx attracts much attention due to its potential health benefits, which arise from its main phenolic compounds including anthocyanins, phenolic acids, flavanols, and flavonols. Among these, anthocyanins, a group of water-soluble pigments, are highly valued in the food and beverage industry, as they not only provide powerful colors to these products but also exert strong antioxidant activity. The purpose of this chapter is to provide an understanding of the aroma, aroma-active, and phenolic compounds and the antioxidant properties of roselle. © 2021 Elsevier Inc. All rights reserved.
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    Elucidation of key odorants and sensory properties of five different extra virgin olive oils from Turkey
    (Consejo Superior Investigaciones Cientificas-Csic, 2023) Sevim, D.; Koseoglu, O.; Kadiroglu, P.; Güçlü, G.; Ulas, M.; Selli, S.
    The present study investigates the aroma, key odorants and sensory profile of extra virgin olive oils from five well-known Turkish cultivars. The aromatic extract obtained by the purge and trap extraction system, according to a sensory analysis, resembled the odor of olive oil. A total of 22, 21, 18, 22 and 21 aroma-active compounds were detected in the extracts of Ayvalik, Memecik, Gemlik, Sari Ulak and Beylik olive oils, respectively. The results show that Ayvalik has the highest flavor dilution (FD) value of 1024 with hex -anal, (E)-2-hexenal and & alpha;-farnesene. Memecik has the highest FD value at 2048 with (E)-2-hexenal. Gemlik has the highest FD value of 1024 with (Z)-3-hexenyl acetate, (E)-2-hexen-1-ol and & alpha;-farnesene. Sari Ulak has the highest FD value at 2048 with (E)-2-hexenal. Beylik has the highest FD value of 2048 with (E)-2-hexenal and hexanal. All cultivars represent the characteristic green, cut-grass, fruity odor notes.