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  • 1. Bianchi, Federica
    et al.
    Agazzi, Silvia
    Riboni, Nicolò
    Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry. University of Parma, Italy.
    Erdal, Nejla
    Hakkarainen, Minna
    Ilag, Leopold
    Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
    Anzillotti, Luca
    Andreoli, Roberta
    Moroni, Fabrizio
    Cecchi, Rossana
    Careri, Maria
    Novel sampling-substrates for the determination of new psychoactive substances in oral fluid by desorption electrospray ionization-high resolution mass spectrometryManuscript (preprint) (Other academic)
  • 2.
    Riboni, Nicolò
    et al.
    Università di Parma, Italy.
    Magrini, Laura
    Bianchi, Federica
    Careri, Maria
    Cappiello, Achille
    Sol-gel coated ion sources for liquid chromatography-direct electronionization mass spectrometry2017In: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 978, p. 35-41Article in journal (Refereed)
    Abstract [en]

    Advances in interfacing liquid chromatography and electron ionization mass spectrometry are presented. New ion source coatings synthesized by sol-gel technology were developed and tested as vaporization surfaces in terms of peak intensity, peak width and peak delay for the liquid chromatography-direct electron ionization mass spectrometry (Direct-EI) determination of environmental pollutants like polycyclic aromatic hydrocarbons and steroids. Silica-, titania-, and zirconia-based coatings were sprayed inside the stainless steel ion source and characterized in terms of thermal stability, film thickness and morphology. Negligible weight losses until 350–400 °C were observed for all the materials, with coating thicknesses in the 6 (±1)-11 (±2) μm range for optimal ionization process. The best performances in terms of both peak intensity and peak width were obtained by using the silica-based coating: the detection of the investigated compounds was feasible at low ng μl−1 levels with a good precision (RSD < 9% for polycyclic aromatic hydrocarbons and <11% for hormones).

  • 3.
    Riboni, Nicolò
    et al.
    Università degli Studi di Parma, Italy.
    Trzcinski, Jakub W.
    Bianchi, Federica
    Massera, Chiara
    Pinalli, Roberta
    Sidisky, Leonard
    Dalcanale, Enrico
    Careri, Maria
    Conformationally blocked quinoxaline cavitand as solid-phase microextraction coating for the selective detection of BTEX in air2016In: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 905, p. 79-84Article in journal (Refereed)
    Abstract [en]

    A tetraquinoxaline cavitand functionalized with methylenoxy bridges at the upper rim is proposed as selective solid-phase microextraction (SPME) coating for the determination of BTEX at trace levels in air. The SPME fibers were characterized in terms of film thickness, morphology, thermal stability and extraction capabilities. An average coating thickness of 35 (±4) μm, a thermal stability up to 350 °C and a good fiber-to-fiber and batch-to-batch repeatability with RSD lower than 15% were obtained. Excellent enrichment factors ranging from 360–700 × 103 were obtained for the investigated compounds. Finally, method validation proved the capabilities of the developed coating for the selective sampling of BTEX, achieving LOD values in the 0.4–1.2 ng m−3 range.

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