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    Wyświetlanie 1-5 z 5
    Tytuł:
    Variability of composition of essential oil and coumarin compounds of Angelica archangelica L.
    Autorzy:
    Forycka, A.
    Buchwald, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048982.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    Angelica archangelica
    essential oil
    coumarins
    furanocoumarins
    chemical composition
    chemotaxonomy
    olejek eteryczny
    kumaryny
    furanokumaryny
    chemotaksonomia
    skład chemiczny
    Opis:
    The medicinal and culinary properties of Angelica archangelica L. have been known and valued since the Middle Ages. Ingredients of essential oil and coumarins found in this plant are to a large degree responsible for its pharmacological activity. This study is a review of the literature of the most important biologically active compounds present in herbal raw materials: root (rhizome with roots) and angelica fruits. Research shows that the content of individual compounds of the essential oil and coumarin fraction is variable, which may point to a large intraspecific variation. Therefore, these compounds may be good markers for identifying taxa or chemotypes in chemotaxonomic research valuable for the herbal medicine and pharmaceutical industry.
    Źródło:
    Herba Polonica; 2019, 65, 4; 62-75
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura pochodnych benzo[ b]furanu i kumaryny oraz ich kompleksów z miedzią (II) i cynkiem(II)
    The structure of benzo[b]furan and courmarin derivatives and their copper (II) and zinc (II) complexes
    Autorzy:
    Drzewiecka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/172518.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    pochodne benzo[b]furanu
    pochodne kumaryny
    kompleks Cu(II)
    kompleks Zn(II)
    struktura kryształu
    badania XAS
    benzo(b)furan derivatives
    coumarin derivatives
    Cu(II) complex
    Zn(II) complex
    crystal structure
    XAS study
    Opis:
    Selected benzo[b]furan and coumarin derivatives with proven and potential antibacterial, anticancer and antiarrhythmic activities have been investigated [1–3] (Figs. 1 and 2). The stereochemical description of their molecules in the solid and gas phase as well as intra- and intermolecular-interactions in crystals have been determined [4–6]. The structural studies of analyzed molecules indicated the planarity of the benzo[b]furan and coumarin ring systems. The oxygen or carbon atoms of the substituents, –OH, –OCH3, –C(=O)CH3 and –COO H, are nearly coplanar with the aromatic ring. The hydroxyl and acetyl groups, being in the ortho position, are coplanar with the aromatic ring and the formation of the intramolecular O–H…O hydrogen bond in all three states of matter is observed. Its strength is around 18 kcal/mol. Several conformers of studied compounds, differing in the orientation of the methoxy, acetyl and/or carboxyl groups, were analyzed. Next, the electrochemical method was used to synthesize novel copper and zinc complexes with the oxygen donor benzo[b]furan and coumarin derivatives. The Cu(II) and Zn(II) complexes have been obtained with carboxylic acids as ligands whereas hydroxy ligands reacted only with copper [6]. The geometry of metal-ligand interaction of new compounds has been determined using a single crystal X-ray crystallography and an X-ray absorption spectroscopy [7, 8]. The combination of these two methods revealed that for some compounds cation environment could depend on the form of the solid sample. In the microcrystalline zinc complexes (studied by EXAFS) the cation is penta-coordinated (ZnO5) with the Zn–O distances being ca 1.98(3) Ĺ. In the recrystallized complex (analyzed by the X-ray diffraction) it was found that zinc is tetra-coordinated (ZnO4). The Cu(II) cation in the singlecrystal form of the complex with the carboxylic acid 5 is penta-coordinated to the carboxylate groups and the ethanol molecule. The bridging COO – groups stabilize the dinuclear complex center Cu2O10. The powdered form of this complex is based on the Cu2O8 units, indicating the absence of the ethanol molecule in the coordination sphere. In the series of the Cu(II) complexes with the hydroxy derivatives of benzo[b]furan and coumarin a centrosymmetric coordination polyhedron of metal exhibits a square-planar geometry (CuO4). Two ligands are bonded to the copper cation via the acetyl and deprotonated hydroxyl O atoms.
    Źródło:
    Wiadomości Chemiczne; 2012, 66, 3-4; 355-369
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pochodne kumaryny jako molekularne sensory fluorescencyjne stosowane do monitorowania procesów fotopolimeryzacji
    Coumarin derivatives as molecular fluorescence probes applied for monitoring photopolymerization processes
    Autorzy:
    Pudo, A.
    Kamińska, I.
    Ortyl, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/134684.pdf
    Data publikacji:
    2015
    Wydawca:
    ADVSEO
    Tematy:
    pochodne kumaryny
    fotopolimeryzacja
    sensory fluorescencyjne
    FPT
    fluorescence probes
    cationic photopolymerization
    radical photopolymerization
    coumarin derivatives
    polymerization processes monitoring
    Opis:
    This paper presents research on the use of coumarin derivatives as fluorescent molecular probes for monitoring cationic and free radical photopolymerization processes, using for that purpose modern FPT method (Fluorescence Probe Technology). Literature review on the main trends of applications and spectroscopic properties of coumarin derivatives was described. In the following part of publication, relations between change of fluorescence characteristic and physicochemical changes occurring in the polymerizable composition, (both microviscosity and polarity) were explained. This article also presented the basic methodology of studies on the control of the photopolymerization reaction on-line and off-line, using fluorescence spectroscopy and parameters such as: fluorescence intensity ratio R, number of progress of the reaction β and molecular probe sensitivity S.
    Źródło:
    Technical Issues; 2015, 1; 47-53
    2392-3954
    Pojawia się w:
    Technical Issues
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Możliwości zastosowania pochodnych kumaryny
    Autorzy:
    Śliwa, P.
    Tomaszkiewicz-Potępa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/274397.pdf
    Data publikacji:
    2010
    Wydawca:
    Roble
    Tematy:
    pochodne kumaryny
    wybielacze optyczne
    fluorescencja
    fluorescencyjne wybielacze optyczne
    coumarin derivatives
    optical whitening agent
    fluorescent whitening agents
    fluorescence
    Źródło:
    LAB Laboratoria, Aparatura, Badania; 2010, 15, 1; 15-20
    1427-5619
    Pojawia się w:
    LAB Laboratoria, Aparatura, Badania
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developmental and chemical characteristics of Melittis melissophyllum L. in limited access of sunlight
    Autorzy:
    Szymborska-Sandhu, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049054.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    shading
    developmental stage
    seed viability
    flavonoids
    phenolic acids
    coumarins
    zacienienie
    fazy rozwojowe
    żywotność nasion
    flawonoidy
    kwasy fenolowe
    kumaryny
    Opis:
    Introduction: Bastard balm grows in forests, in central and southeastern part of Europe. The herb of this species is rich in phenolics, mainly flavonoids, phenolic acids and coumarins. The plant is used in traditional European medicine, in digestive problems and for aromatizing tobacco and alcohol products. Objective: The purpose of this study was to determine the influence of shading on bastard balm development and the accumulation of phenolics in its herb, with special respect to coumarin as a quality marker of this raw material. Methods: The plants were cultivated in full sunlight, in 30% and 50% shade provided by shading nets. The herb was harvested from plants in the third year of vegetation, at four subsequent developmental stages and then subjected to chemical evaluation. In the raw material, the total contents of flavonoids, phenolic acids and coumarins was determined. The content of coumarin was analyzed using HPLC-DAD. Results: Plants grown in 30% shade produced the highest number of flowers and seeds. They produced the highest mass of herb at the beginning of the seed-setting stage. The plants grown in full sunlight revealed the highest content of flavonoids and phenolic acids, especially during flowering and at the beginning of the seed-setting stage. The mass of herb obtained by plants cultivated at deep (50%) shade was the lowest, however, the content of coumarin in these plants was the highest. Conclusion: The influence of shade on bastard balm was expressed by the herb mass and coumarin content increment. The plants thrived best in 30% shade, both in terms of flowering abundance and the mass of herb, whereas those from 50% shade were the richest in coumarin.
    Źródło:
    Herba Polonica; 2020, 66, 1; 1-8
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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