MAKALELER

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https://dspace.ankara.edu.tr/handle/20.500.12575/4809
Bu koleksiyonda Ankara Üniversitesi bünyesinde yayınlanmış ya da yayınlanmamış, Ulusal ve Uluslararası indekslerde yer alan bilimsel dergilerde yayınlanmış veya yayınlanabilir kararı verilmiş makaleler yer almaktadır.

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Browsing MAKALELER by Author "Acıkara, Özlem"

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    Phytochemical analysis of podospermum and scorzonera n-hexane extracts and the hplc quantitation of triterpenes
    (2018) Acıkara, Özlem; Özbilgin, Serkan; İşcan, Hayriye Gülçin Saltan; Eczacılık Fakültesi
    Previously tested n-hexane extracts of the Scorzonera latifolia showed promising bioactivity in vivo. Because triterpenes could account for this activity, n-hexane extracts were analyzed by HPLC to identify and quantify the triterpenes as the most abundant constituents. Other Scorzonera and Podospermum species, potentially containing triterpenic aglycones, were included in the study. An HPLC method for simultaneous determination of triterpene aglycones was therefore developed for analysis of Podospermum and Scorzonera species. n-Hexane extracts of root and aerial parts of S. latifolia, ten other Scorzonera species and two Podospermum species were studied to compare the content of triterpenes. HPLC was used for the qualitative and quantitative analysis of -amyrin, lupeol, lupeol acetate, taraxasteryl acetate, 3--hydroxy-fern-7-en-6-one acetate, urs-12-en-11-one-3-acetyl, 3--hydroxy-fern-8-en-7-one acetate, and olean-12-en-11-one-3-acetyl. Limits of detection and quantification were determined for each compound. HPLC fingerprinting of n-hexane extracts of Podospermum and Scorzonera species revealed relatively large amounts of triterpenes in a majority of investigated taxa. Lupeol, lupeol acetate, and taraxasteryl acetate were found in a majority of the species, except S. acuminata. The presence of -amyrin, 3-hydroxy-fern-7-en-6-one-acetate, urs-12-en-11-one-3-acetyl, 3-hydroxy-fern-8-en-7-one-acetate, and olean-12-en-11-one-3-acetyl was detected in varying amounts. The triterpene content could correlate with the analgesic and anti-inflammatory activity of Scorzonera, which was previously observed and Scorzonera species that have been determined to contain triterpenes in large amounts and have not yet been tested for their analgesic activity should be tested for their potential analgesic and anti-inflammatory potential. The presented HPLC method can be used for analysis of triterpene aglycones, for example dedicated to chemosystematic studies of the Scorzonerinae.
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    Turkish scorzonera species extracts attenuate cytokine secretion via inhibition of NF-κBactivation, showing anti-inflammatory effect in vitro
    (2016) Acıkara, Özlem; İşcan, Hayriye Gülçin Saltan; Smejkal, Karel; Eczacılık Fakültesi
    Scorzonera species are used in different folk medicines to combat many diseases, including the illnesses connected with inflammation. Previous experiments showed anti-inflammatory activity of Scorzonera extracts in vivo. S. latifolia, S. cana var. jacquiniana, S. tomentosa, S. mollis ssp. szowitsii, S. eriophora, S. incisa, S. cinerea, and S. parviflora extracts were, therefore, evaluated for their inhibitory activities of TNF- and IL-1 production, and NF-B nuclear translocation in THP-1 macrophages. The HPLC analysis was carried out to elucidate and to compare the composition of these extracts. Major compounds of the tested extracts have been isolated using different chromatographic techniques and further tested for their inhibitory activities on TNF- and IL-1 production. Several extracts showed promising anti-inflammatory activity in these in vitro tests. Results of HPLC analysis revealed chlorogenic acid as a compound present in all tested extracts. Hyperoside, quercetin-3-O--d-glucoside and rutin were also present in varying amount in some Scorzonera species analyzed. Furthermore, eight phenolics which were identified as quercetin-3-O--d-glucoside (1), hyperoside (2), hydrangenol-8-O-glucoside (3), swertisin (4), 7-methylisoorientin (5), 4,5-O-dicaffeoyl-quinic acid (6), 3,5-di-O-caffeoyl-quinic acid (7), and chlorogenic acid (8) have been isolated as major phenolic compounds of the tested extracts and, together with eight terpenoids (9-16) previously obtained from different Scorzonera species, have been tested for the inhibition of TNF- production, unfortunately with no activity comparable with standard.