Sökning: "Headspace"

Visar resultat 21 - 25 av 32 uppsatser innehållade ordet Headspace.

  1. 21. Identifiering av flyktiga substanser från äppelvin med jästdoft

    Kandidat-uppsats, Linnéuniversitetet/Institutionen för kemi och biomedicin (KOB)

    Författare :Elinor Lindelöw; [2016]
    Nyckelord :Äppelvin; cider; jäst; smak; doft; flyktiga substanser; Saccharomyces cerevisiae; HS-SPME; GCMS;

    Sammanfattning : An apple wine produced by Kiviks Musteri AB have an undesirable flavor of yeast. As a step in the development to reduce this off-flavour the wine flavor was analyzed by gas chromatography-mass spectrometry (GCMS) with headspace solid-phase microextraction (HS-SPME). Two other wines without the flavor of yeast where analyzed as references. LÄS MER

  3. 22. Short-term effects of forest harvesting on CO2 and CH4 accumulation in small boreal lakes.

    Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Emelie Landström; [2014]
    Nyckelord :carbon dioxide; methane; boreal lake; harvesting; accumulation;

    Sammanfattning : The purpose of the study was to examine how forest harvesting affects the accumulation of carbon dioxide (CO2) and methane (CH4) under the ice-cover. Dissolved organic carbon (DOC) was hypothesized to increases post-harvest, this supplementation would in turn lead to an increased accumulation of CO2 and CH4 under the ice-cover. LÄS MER

  4. 23. Laser spectroscopic studies on scattering media - Application to food packages and wood materials

    Magister-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Atomfysik

    Författare :Jim Larsson; [2014]
    Nyckelord :food packages; absorption spectroscopy; wood; diode lasers; scattering media; Physics and Astronomy;

    Sammanfattning : In this project, an optical technique called gas in scattering media absorption spectroscopy (GASMAS) has been employed to investigate optical properties in scattering media such as food packages and wood materials. The GASMAS technique has been combined with a technique called frequency domain photon migration (FDPM) and from the integrated system the gas absorption signal and total optical path length have been assessed when measuring on milk packages. LÄS MER

  5. 24. Lipid oxidation in differently aged beef : use of static headspace gas chromatographic and 2-thiobarbituric acid reactive substance methods (TBARS)

    Master-uppsats, SLU/Dept. of Animal Nutrition and Management

    Författare :Jinzhu Wen; [2013]
    Nyckelord :lipid oxidation; beef ageing; TBARS; static headspace gas chromatography;

    Sammanfattning : This thesis assesses and compares lipid oxidation in beef samples from different ageing approaches by using static headspace gas chromatographic method and 2-thiobarbituric acid reactive substances. Beef samples were compared between three different ageing methods: hang ageing (traditional dry ageing); vacuum bag ageing (wet ageing); and tublin bag ageing and two ageing durations, 10 days or 21 days. LÄS MER

  7. 25. Undersökning av extraherbara ämnen från gummi som används i sprutkomponenter med hjälp av SPME och GC-MS

    Uppsats för yrkesexamina på grundnivå, KTH/Skolan för kemivetenskap (CHE)

    Författare :Martin Masla; [2013]
    Nyckelord :SPME; GC-MS; Rubber; Leachables; Extractables;

    Sammanfattning : Q-Med är ett medicintekniskt företag som tillverkar medicintekniska produkter, exempelvis produkter som är baserade på gel som innehåller bland annat hyaluronsyra. Gelen är placerad i en spruta som innehåller en gummikolv som är i kontakt med gelen. LÄS MER