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Träfflista för sökning "LAR1:cth ;srt2:(1970-1979);hsvcat:1"

Sökning: LAR1:cth > (1970-1979) > Naturvetenskap

  • Resultat 1-10 av 178
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2.
  • Larsson, Kenneth, et al. (författare)
  • Methanolysis of galacturonic acid
  • 1974
  • Ingår i: Carbohydrate Research. ; 34, s. 323-329
  • Tidskriftsartikel (refereegranskat)abstract
    • Dimethyl acetals of galacturono-6,3-lactone and methyl galacturonate are formed during methanolysis of galacturonic acid. The products of methanolysis were studied by ion exchange and gas chromatography. Trimethylsilyl (TMS) derivatives were used in gas chromatography. Structure determinations were made from mass spectra of the TMS derivatives. The course of methanolysis was investigated by means of a gas chromatographic study of the composition of the reaction mixture as a function of time.
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4.
  • Löwendahl, Lars, 1940, et al. (författare)
  • Phenolic compounds in kraft black liquor
  • 1978
  • Ingår i: Svensk Papperstidning. ; 81:12, s. 392-396
  • Tidskriftsartikel (refereegranskat)abstract
    • The prominent phenolic compounds with one aromatic ring in kraft black liquor were analysed by a combination of liquid chromatography, gas chromatography and mass spectrometry. Extracted spruce meal was cooked both under mild, conventional conditions and under extremely severe conditions. In all, the analyzed phenolic compounds amounted to 0.6 kg per 100 kg of dry wood under conventional conditions. In addition to 2-methoxyphenol, vanillin and 4-hydroxy-3-methoxyacetophenone, several phenolic alcohols and carboxylic acids with the same aromatic substitution were isolated and identified. The yield of related 3,4- dihydroxyphenylsubstituted compounds increased under severe conditions.
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5.
  • Petersson, Göran, 1941 (författare)
  • Branched deoxyaldaric acids from alkaline degradation of carbohydrates: Structure determination by mass spectrometry of trimethylsilyl derivatives
  • 1975
  • Ingår i: Carbohydrate Research. ; 43, s. 1-8
  • Tidskriftsartikel (refereegranskat)abstract
    • The deoxyaldaric acids corresponding in structure to the 3-deoxy-2-C-(hydroxymethyl)aldonic (isosaccharinic) acids have been identified as products of treatment of various carbohydrates with alkali and oxygen-alkali. The structures of the acids were determined from the mass spectra of their Me3Si derivatives on the basis of previously known, specific fragmentation reactions. The g.l.c.-m.s. technique was used, and g.l.c. retention data are given. The identified species are 2-deoxy-3-C-(hydroxymethyl)tetraric, 3-deoxy-2-C-hydroxymethyl-erythro-pentaric, 3-deoxy-2-C-hydroxymethyl-threo-pentaric, 2-methyltartronic, 2-(2-hydroxyethyl)tartronic, and 2-(2,3-dihydroxypropyl)tartronic acids. Their formation from 4-O-substituted uronic and ulosonic acids is briefly discussed.
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6.
  • Petersson, Göran, 1941, et al. (författare)
  • Formation of 1,4-anhydro-3-deoxypentitol-2-carboxylic acids by alkaline degradation of cellulose
  • 1976
  • Ingår i: Acta Chemica Scandinavica B. ; 30, s. 27-30
  • Tidskriftsartikel (refereegranskat)abstract
    • An anhydroisosaccharinic acid obtained in large amounts by end-wise degradation of cellulose in alkaline media, and in small amounts in hydrolysates of cellulose, has been identified as a 1,4-anhydro-3-deoxypentitol-2-carboxylic acid (3-hydroxy-5-(hydroxymethyl)oxolane-3-carboxylic acid). Structural evidence was obtained by GC-MS studies of the compounds (as Me3Si derivatives) obtained on degradation of the acid to 1,4-anhydro-3-deoxypentitol by reduction of the methyl ester followed by periodate oxidation and borohydride reduction. In aqueous alkali, the acid is likely to be formed from a dicarbonyl precursor by benzilic acid rearrangement.
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  • Resultat 1-10 av 178
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refereegranskat (127)
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Nordén, Bengt, 1945 (87)
Skarnemark, Gunnar, ... (22)
Davidsson, A (19)
Petersson, Göran, 19 ... (16)
Lundquist, Knut, 193 ... (9)
Larson, Sven Åke, 19 ... (7)
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Lind, Gustaf, 1939 (5)
LINDBLOM, G (5)
de Maré, Jacques, 19 ... (4)
Ahlbom, Kaj (3)
Thulstrup, E. W. (3)
Sundbom, M. (3)
Egardt, Bo, 1950 (3)
Simonson, Rune, 1935 (3)
Johansson, L. B.-A. (3)
Landström, Ove (2)
Malmqvist, David (2)
Jonson, Björn, 1941 (2)
Larsson, Ragnar (2)
Pedersen, P. B. (2)
Lindgren, Georg (1)
Johansson, L (1)
Johansson, K (1)
Tjerneld, Folke (1)
Albinsson, Harry, 19 ... (1)
Larsson, R (1)
Wallden, Lars Erik G ... (1)
Rydberg, Jan, 1923 (1)
Gawronski, J (1)
Rigdahl, Mikael, 195 ... (1)
Brink, Lars, 1943 (1)
Nelander, B. (1)
Prasad, K V S, 1952 (1)
Rootzén, Holger, 194 ... (1)
Andersson, Bengt, 19 ... (1)
Molander, Per (1)
Blomquist, J. (1)
Askne, Jan, 1936 (1)
Wendin, Göran, 1942 (1)
Hjalmarsson, Åke, 19 ... (1)
Rudemo, Mats, 1937 (1)
Danielsson, S (1)
Fontell, K (1)
Sjoholm, I (1)
Brenner, Philip, 194 ... (1)
Cato, B. Torgny, 194 ... (1)
Holm, Sture, 1936 (1)
Dahlgren, T. (1)
Glans, J. (1)
Gronowitz, S. (1)
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Chalmers tekniska högskola (178)
Göteborgs universitet (6)
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Naturvetenskap (178)Ta bort avgränsningen
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