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  • 1
    Digitale Medien
    Digitale Medien
    The application of high performance liquid chromatography, coupled to nuclear magnetic resonance spectroscopy and mass spectrometry (HPLC-NMR-MS), to the characterisation of ibuprofen metabolites from human urine (1998)
    Springer
    Chromatographia 47 (1998), S. 264-270 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; NMR and MS detection ; Ibuprofen metabolites ; Urine extracts
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The use of HPLC-NMR-MS for the detection and identification of the metabolites of ibuprofen present in a solid phase extract of human urine is described. Gradient reversed-phase HPLC was used to separate the components present in the extract, which were then characterised by a combination of stopped-flow1H NMR and on line electrospray-MS. This approach led to the rapid identification of the known phase 1 human metabolites of ibuprofen, including hydroxy- and carboxy- metabolites, together with their respective glucuronide conjugates. In addition a probable artefact resulting from the dehydration of one of the side chainhydroxylated glucuronides was also identified.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02466530
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Determination of the curcuminoid pigments in turmeric (Curcuma domestica Val) by reversed-phase high-performance liquid chromatography (1992)
    Springer
    Chromatographia 34 (1992), S. 73-77 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Curcuminoid pigments ; Turmeric,Curcuma domestica Val
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A rapid, simple and reproducible reversed-phase high-performance liquid chromatographic method was developed for the quantitative determination of curcumin, demethoxycurcumin and bis-demethoxycurcumin in ethanolic extracts of turmeric. The pigments were separated on a styrene-divinylbenzene copolymer column (Hamilton PRP-1), using an acetonitrile-water (55∶45, v/v) mobile phase. The pigments were monitored with a diode-array detector at 425 nm. The limit of detection was 10.2 ng curcumin, 11.1 ng demethoxycurcumin and 6.2 ng bis-demethoxycurcumin. Comparison of HPLC and spectrophotometric results for the determination of the total curcuminoid content for a number of turmeric samples, reveal that the spectrophotometric method invariably yielded higher results, indicating an overestimation of curcuminoids.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02290463
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    facet.materialart.
    Unbekannt
    Investigation of Structural Properties of Carbon-Epoxy Composites Using Fiber-Bragg Gratings (2002)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-18
    Beschreibung: Fiber Bragg-gratings are embedded in carbon-epoxy laminates as well as bonded on the surface of cylindrical structures fabricated out of such composites. Structural properties of such composites is investigated. The measurements include stress-strain relation in laminates and Poisson's ratio in several specimens with varying orientation of the optical fiber Bragg-sensor with respect to the carbon fiber in an epoxy matrix. Additionally, Bragg gratings are bonded on the surface of cylinders fabricated out of carbon-epoxy composites and longitudinal and hoop strain on the surface is measured.
    Schlagwort(e): Composite Materials
    Materialart: Photonics North 2002 Conference; Jun 02, 2002 - Jun 06, 2002; Quebec; Canada
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unbekannt
    Investigation of Carbon-Polymer Structures with Embedded Fiber-Optic Bragg Gratings (2003)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-18
    Beschreibung: Several Bragg-grating sensors fabricated within the same optical fiber are buried within multiple-ply carbon-epoxy planar and cylindrical structures. Effect of different orientation of fiber-sensors with respect to carbon fibers in the composite structure is investigated. This is done for both fabric and uni-tape material samples. Response of planar structures to axial and transverse strain up to 1 millistrain is investigated with distributed Bragg-grating sensors. Material properties like Young's Modulus and Poisson ratio is measured. A comparison is made between response measured by sensors in different ply-layers and those bonded on the surface. The results from buried fiber- sensors do not completely agree with surface bonded conventional strain gauges. A plausible explanation is given for observed differences. The planar structures are subjected to impacts with energies up to 10 ft-lb. Effect of this impact on the material stiffness is also investigated with buried fiber-optic Bragg sensors. The strain response of such optical sensors is also measured for cylindrical carbon-epoxy composite structures. The sensors are buried within the walls of the cylinder as well as surface bonded in both the axial as well as hoop directions. The response of these fiber-optic sensors is investigated by pressurizing the cylinder up to its burst pressure of around 1500 psi. This is done at both room temperature as well as cryogenic temperatures. The recorded response is compared with that from a conventional strain gauge.
    Schlagwort(e): Composite Materials
    Materialart: NASA MSFC 2003 Propulsion Measurement Sensor Development Workshop; May 13, 2003 - May 15, 2003; Huntsville, AL; United States
    Format: text
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