Sökning: "Headspace"

Visar resultat 6 - 10 av 30 avhandlingar innehållade ordet Headspace.

  1. 6. Solid-Phase Microextraction in Polymer Analysis - Extraction of Volatiles from Virgin and Recycled Polyamide 6.6

    Författare :Mikael Gröning; Minna Hakkarainen; Stephen Kelley; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry; polymer; polyamide 6.6; volatiles; emissions; degradation; quantitation; Kemi; Chemistry; Kemi;

    Sammanfattning : The extraction and quantitative analysis of low molar mass compounds in polymers is an analytical challenge. It is also important from a practical point of view because the low molar mass compounds in time will migrate from the polymers into the surrounding environment. LÄS MER

  3. 7. Aroma and Flavor in Liquid Beet Sugar Processing

    Författare :Per Pihlsgård; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; liquid beet sugar; aroma release; liquid beet sugar process; electronic nose; aroma; sensory analysis; macromolecules; flavor; GC-MS; GC-olfactometry;

    Sammanfattning : Production of liquid beet sugar, a product of increasing importance for the food industry, involves many different compounds exhibiting aroma. Aroma compounds are introduced with the raw material, the sugar beets, but also formed as a result of sugar degradation (caramelization and Maillard reaction) or by contamination from process steps, such as adsorbents and ion exchangers. LÄS MER

  4. 8. Sample preparation and analysis of metabolites from plants in the families of Cyperaceae, Poaceae and Apiaceae

    Författare :Linus Svenberg; Åsa Emmer; Jenny Lindh; Margareta Sandahl; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Gas chromatography; Mass spectrometry; Ultrasound assisted extraction; Solid-phase microextraction; Volatile compounds; Allelopathy; Bioassay; Gaskromatografi; Masspektrometri; Ultraljudsassisterad extraktion; fastfas-mikroextraktion; Flyktiga ämnen; Allelopati; Bioanalys; Kemi; Chemistry;

    Sammanfattning : An important aspect of understanding how plants effect their environmentis the study of volatile compounds and how these influence interactions between plants and other living organisms. The study of these secondary metabolites from plants can be used in practical applications, such as behaviour control of insects, and is an important part in the search for novel compounds that can be used to influence the behaviour of disease spreading vectors. LÄS MER

  5. 9. Black mustard and the butterfly effect : metabolomics of plant-insect interactions under multiple stress conditions

    Författare :Stefano Papazian; Benedicte Albrectsen; Edward Farmer; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; plant physiology; metabolomics; glucosinolates; multiple stress; ozone; Brassica nigra; Pieris brassicae; Brevicoryne brassicae; biology; biologi; Environmental Science; miljövetenskap; molekylärbiologi; Molecular Biology; Entomology; entomologi;

    Sammanfattning : One main goal of ecological research is to understand nature´s complexity, in order to predict the potential impact of environmental perturbations. In this thesis, I investigate the ecological interactions between some of the most ancient organisms living on our planet: plants and insects. LÄS MER

  7. 10. Cold trapping and reinjection techniques for gas chromatography-mass spectrometry

    Författare :Sven P. Jacobsson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis describes the use of cold trapping and reinjection techniques in combination with gas chromatography-mass spectrometry. A summary of different cold trap/ reinjection systems is presented. LÄS MER