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    Anatomical and Phytochemical Characteristics of Different Parts of Hypericum scabrum L. Extracts, Essential Oils, and Their Antimicrobial Potential
    (Mdpi, 2022) Ergin, Kubra Nalkiran; Karakaya, Songul; Goeger, Gamze; Sytar, Oksana; Demirci, Betul; Duman, Hayri
    Hypericum (Hypericaceae) is a genus that comprises a high number of species around the world. In this study, the roots, aerial parts, flowers, fruits, and aerial parts with flowers from Hypericum scabrum were macerated separately by methanol and water and then fractionated by different solvents of, such as ethyl acetate, n-hexane, butanol, dichloromethane, aqueous residue sub-extracts, and ethnobotanical use. All the extracts, sub-extracts and essential oils of H. scabrum were investigated for the first time in detail for their antimicrobial, total phenolics, and antioxidant activities. Anatomical structures of the root, stem, leaf, upper and lower leaf surface, stamen, sepal, and petal of H. scabrum were examined. The biochemical layout of essential oils was determined by GC and GC/MS. The antioxidant activity was determined by free radical scavenging activity (by DPPH). Antimicrobial activity was applied against Candida albicans ATCC 10231, Escherichia coli ATCC 8739, Staphylococcus aureus ATCC 6538, Bacillus subtilis ATCC 19659, and C. tropicalis ATCC 750 using microdilution methods. The essentials of the aerial parts, flower, and fruit are characterized by the presence of monoterpene hydrocarbons, whereas roots oil include alkanes. The GC-FID and GC-MS analysis showed that major components of roots, aerial parts, flowers, and fruits oils were undecane (66.1%); alpha-pinene (17.5%), gamma-terpinene (17.4%), and alpha-thujene (16.9%); alpha-pinene (55.6%), alpha-thujene (10.9%), and gamma-terpinene (7.7%); alpha-pinene (85.2%), respectively. The aerial part sub-extracts indicated a greater level of total phenolics and antioxidant potential. The n-hexane sub-extracts (from aerial part, flower, and aerial part with flower) showed the best activity against B. subtilis, with 39.06 mu g/mL MIC value. The presented research work indicates that H. scabrum can be a novel promising resource of natural antioxidant and antimicrobial compounds.
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    Comparison of Essential Oils of Ferulago pachyloba (Fenzl) Boiss., F. trachycarpa Boiss. and F. bracteata Boiss. & Hausskn. Species (Apiaceae) Growing in Turkey and Determination of Their Antimicrobial Activities
    (Taylor & Francis Ltd, 2019) Karakaya, Songul; Simsek, Duygu; Goger, Gamze; Demirci, Betul; Duman, Hayri; Altanlar, Nurten; Kilic, Ceyda Sibel
    Ferulago species have been utilized since ancient times as antihelmentic, digestive, sedative and aphrodisiac, along with in salads or as a seasoning in view of their special odours. F. pachyloba (Fenzl) Boiss., F. trachycarpa Boiss. and F. bracteata Boiss. & Hausskn. species were investigated for their chemical compositions of essential oils and their antimicrobial activities. Antimicrobial activities of essential oils were performed via microbroth-dilution and TLC bioautography methods. GC and GC/MS were utilized to analyse the essential oils. Primary components of aerial parts, flowers, roots and fruits of F. pachyloba were found as, sabinene (16.0 %), (Z)-beta-ocimene (15.1 %); sabinene (25.8 %), (Z)-beta-ocimene (27.5 %); (E)-2-decenal (14.3 %); bicyclogermacrene (11.1 %), respectively. Primary components of aerial parts, roots and fruits of F. trachycarpa were found as, (Z)-beta-ocimene (13.8 %), spathulenol (25.0 %); (E)-2-decenal (11.9 %); spathulenol (32.8 %), bicyclogermacrene (23.0 %). Primary components of aerial parts, flowers and roots of F. bracteata were found as, 7-methoxy-6-(3-methyl-2-butenyl)-coumarin (86.7 %); beta-pinene (12.1 %), beta-phellandrene (22.8 %); (E)-2- decenal (13.9 %), hexadecanoic acid (40.4 %). Essential oils were particularly more effective against Staphylococcus aureus, with MIC values of between 0.39 and 6.25 g/mL, respectively. They did not give significant inhibition against Pseudomonas aeruginosa by TLC bioautography assay. In contrast, they had active components against S. aureus and showed significant inhibition. The antimicrobial activities against these microorganisms from these species may be attributed to the presence of the main components in the essential oils.
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    Comparison of the Essential Oils of Ferula orientalis L., Ferulago sandrasica Pesmen and Quezel, and Hippomarathrum microcarpum Petrov and Their Antimicrobial Activity
    (Turkish Pharmacists Assoc, 2019) Karakaya, Songul; Goger, Gamze; Bostanlik, Fatmagul D.; Demirci, Betul; Duman, Hayri; Kilic, Ceyda Sibel
    Objectives: To determine the chemical composition and antimicrobial activity of the essential oils of the aerial parts of Ferula orientalis L., roots of Ferulago sandrasica Pesmen and Quezel, and aerial parts of Hippomarathrum microcarpum Petrov. Materials and Methods: Essential oils were analyzed by gas chromatography and gas chromatography/mass spectrometry. The antimicrobial activity of the essential oils was determined by bioautography assay. Results: alpha-Pinene (75.9%) and beta-pinene (3.4%) were the major components of the aerial parts of F. orientalis; with limonene (28.9%), beta-pinene (15.6%), and terpinolene (13.9%) for F. sandrasica; and beta-caryophyllene (31.4%) and caryophyllene oxide (23.1%) for the aerial parts of H. microcarpum. Essential oils from the aerial parts of F. orientalis, the roots of F. sandrasica, and the aerial parts of H. microcarpum were active against Staphylococcus aureus and Candida albicans strains. However, essential oils were not active against Pseudomonas aeruginosa or Escherichia coli. Conclusion: The antimicrobial activities against S. aureus and C. albicans of these species may be attributed to the presence of the main components in the essential oils.