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Sökning: WFRF:(Schuhmann R)

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  • Bowden, John A., et al. (författare)
  • Harmonizing lipidomics : NIST interlaboratory comparison exercise for lipidomics using SRM 1950-Metabolites in Frozen Human Plasma
  • 2017
  • Ingår i: Journal of Lipid Research. - 0022-2275 .- 1539-7262. ; 58:12, s. 2275-2288
  • Tidskriftsartikel (refereegranskat)abstract
    • As the lipidomics field continues to advance, self-evaluation within the community is critical. Here, we performed an interlaboratory comparison exercise for lipidomics using Standard Reference Material (SRM) 1950-Metabolites in Frozen Human Plasma, a commercially available reference material. The interlaboratory study comprised 31 diverse laboratories, with each laboratory using a different lipidomics workflow. A total of 1,527 unique lipids were measured across all laboratories and consensus location estimates and associated uncertainties were determined for 339 of these lipids measured at the sum composition level by five or more participating laboratories. These evaluated lipids detected in SRM 1950 serve as community-wide benchmarks for intra-and interlaboratory quality control and method validation. These analyses were performed using nonstandardized laboratory-independent workflows. The consensus locations were also compared with a previous examination of SRM 1950 by the LIPID MAPS consortium.jlr While the central theme of the interlaboratory study was to provide values to help harmonize lipids, lipid mediators, and precursor measurements across the community, it was also initiated to stimulate a discussion regarding areas in need of improvement.
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  • Kaden, Heike, et al. (författare)
  • Detection of moisture differences of a swellable and a non-swellable clay in the low and mid frequency range
  • 2011
  • Ingår i: 6th Conference on Innovative Moisture Measurement in Research and Practise, Karlsruhe, Oct. 2011. ; , s. 10pp-
  • Konferensbidrag (refereegranskat)abstract
    • The sensitivity of dielectric spectroscopy to display changes in moisture content was studied for one swellable (bentonite) and one non-swellable clay (illite) in the low (1.0E-04…1.0E+06 Hz) and mid (2.0E+08…1.1E+09 Hz) frequency range. Therefore, both air dry materials were stored until equilibration at 11% and 93% relative humidity (r.h.) and their volumetric water content (Wvol) was measured with static and dynamic heating as well as with dielectric spectroscopy. Transformation of complex permittivity to Wvol was accomplished using the calibration functions after Topp and Roth. Moisture distinction could be displayed for both materials in the lower frequency range, whereas the changes in water content could only be described for the illite within the mid frequency range. Estimation of volumetric water content by transformation of real relative permittivity with Topp-function, resulted in underestimation of Wvol, especially for samples stored at high relative humidity (93% r.h.). Determination of Wvol with the calibration function after Roth was successful for illite at 11% r.h., but failed at higher relative humidity and for the bentonite in both hydration states. Additionally, complex dielectric data were clearly influenced by other processes beside bound water polarization.
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