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- Bäcktorp, Carina, 1964, et al.
(författare)
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Theoretical investigation of linalool oxidation.
- 2006
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Ingår i: The journal of physical chemistry. A. - : American Chemical Society (ACS). - 1089-5639 .- 1520-5215. ; 110:44, s. 12204-12
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Tidskriftsartikel (refereegranskat)abstract
- This study concerns the autoxidation of one of the most used fragrances in daily life, linalool (3,7-dimethyl-1,6-octadien-3-ol). It reacts with O2 to form hydroperoxides, which are known to be important contact allergens. Pathways for hydroperoxide formation are investigated by means of quantum mechanical electronic structure calculations. Optimized molecular geometries and harmonic vibrational frequencies are determined using density functional theory (DFT). Insight into how the addition of O2 to linalool occurs is obtained by establishing a theoretical framework and systematically investigating three smaller systems: propene, 2-methyl-2-butene, and 2-methyl-2-pentene. 2-Methyl-2-pentene was chosen as a model system and used to compare with linalool. This theoretical study characterizes the linalool-O2 biradical intermediate state, which constitutes a branching point for the further oxidation reactions pathways. Thus, the observed linalool oxidation product spectrum is discussed in terms of a direct reaction path, the ene-type mechanism, and the radical mechanism. The major hydroperoxide found in experiments is 7-hydroperoxy-3,7-dimethyl-octa-1,5-diene-3-ol, and the calculated results support this finding.
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| 3. |
- Forssberg, Eric, et al.
(författare)
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Method for determining the attraction forces on magnetic separators
- 1972
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Ingår i: Scandinavian journal of metallurgy. - 0371-0459 .- 1600-0692. ; 1:6, s. 290-292
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Tidskriftsartikel (refereegranskat)abstract
- The equipment here only measures the radial component of magnetic attraction. The radial component is also of interest in separations where centrifugal force and the force of gravity are to be balanced against the magnetic attraction, i. e. dry top-feed separators for both coarse and fine material. In the case of wet separators, the radial component has the greatest influence on attraction to the drum surface of magnetic particles and on the ability of the magnet assembly to retain the magnetic material on the surface.
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| 4. |
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| 5. |
- Hagvall, Lina, 1978, et al.
(författare)
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Lavender oil lacks natural protection against autoxidation, forming strong contact allergens on air exposure
- 2008
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Ingår i: Contact Dermatitis. - : Wiley. - 0105-1873 .- 1600-0536. ; 59:3, s. 143-150
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Tidskriftsartikel (refereegranskat)abstract
- Lavender oil is an essential oil frequently used as a fragrance ingredient and in traditional herbal medicine. We have previously studied the effect of air oxidation on the skin sensitizing potency of the monoterpenes linalyl acetate, linalool and β-caryophyllene, the main constituents of lavender oil.
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