2,190 research outputs found

    CHIRAL ANALYSIS OF MONOTERPENES IN VOLATILE OILS FROM PROPOLIS

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    ABSTRACT The essential oils obtained by hydrodistillation from samples of propolis manufactured in three regions of Rio Grande do Sul State at Brazil, were analyzed through CG, CG-MS and chiral phase gas chromatography (CPGC). These analyses display the presence of samples with elevated essential oil purport, when compared with plants. The yields obtained were until 3.8%. The samples exhibited similar composition, with predominance of the monoterpenes a-pinene (57-63%), b-pinene (12.5-30.8%) and limonene (1.5-11.2%). In chiral analysis of these constituents were observed modifications in the enantiomeric excess of isomers of a-pinene and limonene in relation with source location of the sample, already in the chiral analysis of b-pinene were detected only elevated excess of the enantiomer with the (-) configuration. The antimicrobial activity of the crude essential oil was assayed against five bacteria. The best result was obtained against Staphylococcus aureus

    Seasonal variation, chemical composition and antimicrobial activity of essential oil of achyrocline satureoides (Lam.) D.C.

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    Seasonal variation of the oil composition and biological activities from aerial parts of Achyrocline satureoides were investigated. Essential oils were analysed by gas crhromatography-mass spectrometry (GC-MS) after hydrodestillation. Results exhibited maximum amounts of hydrodistilled essential oils in spring (0.10 %; m/m). The compounds α-pinene (28.5-41.7 %) and (E)-caryophyllene (29.8-38.5 %) were the most abundant component in all seasons. Antimicrobial activity measurement of minimum inhibitory concentration (MIC) varied significantly (p < 0.05). It was more significant in autumn (37.9 μg/mL) and winter (38.4 μg/mL) than other seasons against bacterial strains Staphylococcus epidermidis ATCC11228. MIC against bacterial strains Bacillus cereus ATCC11778 was 37.9 μg/mL (autumn) and 76.8 μg/mL (winter) and 37.9 μg/mL (autumn) and 76.8 μg/mL (winter) against bacterial strains Klebsiella pneumoniae ATCC13883. The results showed that yield, chemical composition and antimicrobial activity of essential oil of Achyrocline satureoides (Lam) D.C changed according to the plant collection period.Colegio de Farmacéuticos de la Provincia de Buenos Aire

    Status report of the RD5 experiment

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    Search for vector-like T quarks decaying to top quarks and Higgs bosons in the all-hadronic channel using jet substructure

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    Search for the production of dark matter in association with top-quark pairs in the single-lepton final state in proton-proton collisions at √s=8 TeV

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    Search for supersymmetry in events with a photon, a lepton, and missing transverse momentum in pp collisions at root s=8 TeV

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    Angular analysis of the decay B-0 -> K*(0)mu(+)mu(-) from pp collisions at root s=8 TeV

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    Search for a charged Higgs boson in pp collisions at root s=8 TeV

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