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  • 1.
    Arvstrand, Linus
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för analytisk kemi.
    Target analysis of synthetic phenolic antioxidants in human serum, prioritized by using an exposure index applied to the Swedish Products Register2021Independent thesis Advanced level (degree of Master (Two Years)), 40 poäng / 60 hpOppgave
    Abstract [en]

    Chemicals entering the market have been steadily increasing. The Swedish Chemicals Agency is in control of the Swedish Products Register, which is storing information on chemicals  manufactured in, transferred, or imported into Sweden. Applied to the register comes the exposure index predicting exposure of chemicals. For this study, the exposure index was used to make a first prioritization of chemicals with potential of exposure to consumers, the list of suspects were further prioritized by in silico predicted physiochemical properties. Six synthetic antioxidants 2,4-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, 2,4,6-tris-tert-butyl-phenol, 2,2´-methylene-bis(4-methyl-6-tert-butylphenol), 4,4´-methylene-bis(2,6-di-tert-butylphenol), octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenol) propionate), were selected for target analysis. Great care to background contamination is applied since the analytes are used in everyday objects such as food package and personal care products. Human serum samples was collected from “Blodcentralen” in Stockholm, Sweden. Previous analytical methods exist for individual and combination for a few analytes but lacks in combination of all selected analytes. A previous method for the extraction without clean-up of some of the analytes in serum were tested but lacked in efficiency for all analytes, hence an clean-up step for removal of lipids were added. A gas chromatography mass spectrometry method was developed for simultaneous analysis of the six analytes. Four of the target analytes were detected and three were quantified (2,4-di-tert-butylphenol 2.20-3.33 ng/mL, 2,6-di-tert-butyl-4-methylphenol 3.22-3.93 ng/mL and 2,4,6-tris-tert-butyl-phenol 0.054-0.104 ng/mL). 2,2´-methylene-bis(4-methyl-6-tert-butylphenol) was detected in high concentration but due to linearity problems (R2<0.99) it was not quantified. To the best of my knowledge this is the first time that 2,4,6-tri-tert-butylphenol and 2,2´- methylene-bis(4-methyl-6-tert-butylphenol) have been detected in human serum.

    Fulltekst (pdf)
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  • 2.
    Radoman, Nikola
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för analytisk kemi.
    Ian, Cousins
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap.
    Salter, Matthew
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap.
    Enrichment behaviour of cationic surfactants on laboratory-generated sea spray aerosol2022Manuskript (preprint) (Annet vitenskapelig)
  • 3.
    Wang, Qiang
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
    Nilsson, Tomas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för analytisk kemi.
    Eriksson, Lars
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för oorganisk kemi och strukturkemi.
    Szabó, Kálmán J.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
    Sulfenofunctionalization of Chiral α-Trifluoromethyl Allylboronic Acids: Asymmetric Synthesis of SCF3, SCF2R, SCN and SAr Compounds2022Inngår i: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 61, nr 46, artikkel-id e202210509Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report herein a new method for the synthesis of densely functionalized chiral allyl SCF3, SCF2R, SCN and SAr species with a separate CF3 functionality. The synthetic approach is based on selenium-catalyzed sulfenofunctionalization of chiral α-CF3 allylboronic acids. The reactions proceeded with remarkably high stereo-, diastereo- and site-selectivity, based on the formation of a stable thiiranium ion followed by rapid deborylative ring opening. © 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.

  • 4.
    Wännman, Thomas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK), Avdelningen för analytisk kemi.
    Methods for the preparation of capillary columns for gas chromatography1985Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This thesis is dedicated to column technology, and describes methods for the preparation of efficient, well deactivated and durable capillary columns for gas chromatography.

    Problems associated with column preparation are discussed in conjunction with a brief literature survey of the most important contributions to column technology since the concept of capillary gas chromatography was first introduced by M.J.E.Golay in 1957.

    Methods of preparation reported are:

    - Chemical surface modification of the capillary tubing, using cyclic siloxanes at high temperatures.

    This modification resulted in a thermostable deactivation of surface hydroxyl groups. Surface characteristics, such as wettability, can be controlled by using cyclic siloxanes with different organic substituents.

    - Static coating using liquid butane as solvent for the stationary phase.

    With a liquified gas as solvent, the speed of evaporation is increased thus makes the static coating less time-consuming.

    - Immobilization of stationary phases by in situ cross-linking. Three different cross-linking techniques have been investigated :

    1. Heat induced condensation.

    2. Cross-linking with tetrachlorosilane.

    3. Free radical-initiated cross-linking using dicumyl peroxide. Highly stable columns were obtained and the merits of each method are discussed.

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