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  • 1.
    Andersson, J
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Wågberg, Lars
    KTHB.
    Ageing of Flexographic Printed Model Cellulose Surfaces and Determination of the Mechanisms Behind Ageing2009In: Pulp & paper Canada, ISSN 0316-4004, Vol. 110, no 7-8, p. 34-38Article in journal (Refereed)
    Abstract [en]

    The influence of storage conditions on the ink detachment efficiency of

    water-based flexographic ink printed onto model cellulose surfaces and

    handsheets was investigated. It was shown that UV light, elevated

    temperatures, longer storage time, increasing surface roughness, and

    increasing surface hydrophobicity all had a negative effect on ink

    detachment. It was also shown that the ink's chemical and structural

    characteristics changed when stored at elevated temperatures. No

    chemical or structural changes could be observed for the ink when

    stored under UV light.

     

  • 2.
    Forsström [Andersson], J.
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Wågberg, L.
    Royal Institute of Technology.
    Ageing of flexographic printed model cellulose surfaces and determination of the mechanisms behind ageing2004In: Research Forum on Recycling, Proceedings, TAPPI Press, 2004, p. 21-25Conference paper (Refereed)
    Abstract [en]

    The influence of storage conditions on the ink detachment efficiency of water-based flexographic ink printed onto model cellulose surfaces and hand sheets were investigated. It was shown that UV-light, elevated temperatures, longer storage time, increasing surface roughness and increasing surface hydrophobicity all had a negative effect on ink detachment. It was also shown that the ink's chemical and structural characteristics changed when stored at elevated temperatures. No chemical or structural changes could be observed for the ink when stored under UV-light.

  • 3.
    Hedenström, Erik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Wallin, Erika
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Andersson, J
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Bång, Joakim
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Wang, H-L
    Department of Biology, Lund University, Sölvegatan 37, Lund, Sweden .
    Löfstedt, C
    Department of Biology, Lund University, Sölvegatan 37, Lund, Sweden .
    Brattström, O
    Department of Zoology, Cambridge University, Cambridge, United Kingdom.
    Baquet, P
    Evolutionary Ecology and Genetics group, Biodiversity Research Centre, Earth and Life Institute, Académie Louvain, Croix du Sud 4, Louvain-la-Neuve, Belgium.
    Stereoisomeric Analysis of 6,10,14-Trimethylpentadecan-2-ol and the Corresponding Ketone in Wing Extracts from African Bicyclus Butterfly Species2015In: Journal of Chemical Ecology, ISSN 0098-0331, E-ISSN 1573-1561, Vol. 41, no 1, p. 44-51Article in journal (Refereed)
    Abstract [en]

    Gas chromatography (GC) and mass spectrometry (MS) were used to determine the stereoisomeric compositions of 6,10,14-trimethylpentadecan-2-ol and 6,10,14-trimethylpentadecan-2-one in wing extracts from 17 Bicyclus butterfly species from different regions of Africa. All samples were purified using solid phase extraction (SPE). Since some species contained both alcohol and ketone, these were separated and the ketone was reduced to the alcohol before analysis as either (R)-trans-chrysanthemoyl or (S)-2-acetoxypropionyl esters. A novel asymmetric synthesis was developed for a reference mixture of (2R/S,6S,10R)-6,10,14-trimethylpentadecan-2-ol with known composition of the eight stereoisomers. The mixture then was used as the (R)-trans-chrysanthemoyl esters to correlate each of the eight gas chromatographic peaks to a specific stereoisomer of the extracted wing compounds. Seven butterfly species showed (2R,6R,10R)-configuration of the alcohol, four species contained minute amounts of alcohol too small to determine the stereochemistry, nine species showed (6R,10R)-configuration of the ketone, and one species contained minute amounts of ketone too small to determine the stereochemistry. No other stereoisomers of alcohol or ketone could be detected in the extracts, and the quantities of the compounds in the wing extracts varied from 5 to 900 ng per sample for each species.

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