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Träfflista för sökning "WAKA:ref ;lar1:(cth);srt2:(1970-1979);pers:(Petersson Göran 1941)"

Sökning: WAKA:ref > Chalmers tekniska högskola > (1970-1979) > Petersson Göran 1941

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1.
  • Havlicek, Jaroslav, et al. (författare)
  • Partition chromatography and mass spectrometry of tetrulose and pentuloses
  • 1972
  • Ingår i: Acta Chemica Scandinavica. ; 26, s. 2205-2215
  • Tidskriftsartikel (refereegranskat)abstract
    • Partition chromatography on ion exchange resins in aqueous ethanol is an excellent tool for the separation of tetrulose and pentuloses for both analytical and preparative purposes. The analysis of complex mixtures is facilitated by the fact that the ketoses are recorded by both the orcinol and periodate-formaldehyde methods whereas under proper conditions aldoses are only recorded in the orcinol channel. In gas chromatography the trimethylsilylated 3-pentuloses gave rise to only one prominent peak which as revealed by mass spectrometry corresponded to the keto form. Tetrulose and the 2-pentuloses gave two or more peaks. The 1,2-enediol derivative obtained from tetrulose was identical with that recorded for threose.
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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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3.
  • Löwendahl, Lars, 1940, et al. (författare)
  • Dicarboxylic acids produced by oxygen-alkali treatment of birch xylan
  • 1975
  • Ingår i: Acta Chem. Scand. B. ; 29:4, s. 526-527
  • Tidskriftsartikel (refereegranskat)abstract
    • C-(2-Hydroxyethyl)tartronic acid is predominant among the dicarboxylic acids and its formation in 12 % yield makes it a major product from xylan. The structure indicates that it is formed from terminal, oxidized xylose units by beta-elimination at C-4 and subsequent benzilic acid rearrangement. It is proposed that 2-ulosonic acid end-groups or ulosono-1,5-lactone end-groups, related in structure to ascorbic acid, are formed as precursors.
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4.
  • Löwendahl, Lars, 1940, et al. (författare)
  • Oxygen-alkali treatment of cellobiose
  • 1975
  • Ingår i: Acta Chem. Scand. B. ; 29:9, s. 975-980
  • Tidskriftsartikel (refereegranskat)abstract
    • C-(2,3-Dihydroxypropyl)tartronic acid is a major dicarboxylic acid formed during O2-NaOH and O2-NaHCO3 treatment of cellobiose. The observation that this acid is the main reaction product after alkali treatment ofascorbic acid in O2-free medium supports the conclusion that it is formed via an aglycon moiety related to ascorbic acid. Other dicarboxylic acids from cellobiose are oxalic, tartronic, deoxytetraric, C-(hydroxymethyl)tartronic, and succinic acids.The temperature, pH and additions of iron and cobalt salts strongly influence the product composition. The formation of aldobionic acids from cellobiose parallels the formationof aldonic acid end groups during oxygen bleaching of cellulose.
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5.
  • 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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6.
  • Mattsson, Mary, 1945, et al. (författare)
  • Reference GLC data for the analysis of phenolic compounds as trimethylsilyl derivatives
  • 1977
  • Ingår i: Journal of Chromatographic Science. - 0021-9665. ; 15, s. 546-554
  • Tidskriftsartikel (refereegranskat)abstract
    • Comprehensive reference GLC data are given for trimethylsilyl derivatives of about 130 aromatic compounds grouped as phenols and naphthols, alcohols, carboxylic acids, aldehydes and ketones, and chloro compounds. The aldehydes and ketones were analysed as both oxime and O-methyl oxime derivatives. Retention data on methyl and phenyl silicone columns are given as MU values in temperature-programmed analysis. Correlations between structure and retention are interpreted in terms of MU increments of structural elements. Methods for predicting MU values are proposed. Diagrams based on differences in MU between the two silicone phases aid in qualitative analysis. Approximate FID relative molar response values were estimated from the atomic composition of the derivatives.
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7.
  • Petersson, Göran, 1941 (författare)
  • A McLafferty - type rearrangement of a trimethylsilyl group in silylated hydroxy carbonyl compounds
  • 1972
  • Ingår i: Organic Mass Spectrometry. ; 6, s. 577-592
  • Tidskriftsartikel (refereegranskat)abstract
    • A McLafferty-type rearrangement of a trimethylsilyl group is demonstrated. Abundant rearrangement ions are formed for trimethylsilyl derivatives of alpha,beta-dihydroxy carbonyl compounds. Data are given for a large number of hydroxy acids and hydroxy ketones including aldonic acids, aldaric acids, acyclic ketoses and hydroxy keto acids. A few branched lactones are also shown to rearrange. The positive charge and the unpaired electron are extensively delocalized in the odd-electron rearrangement ions. Those substituents at the alpha-carbon atom which offer a favourable delocalization promote the rearrangement. Spectra of specifically methylated species reveal that migration over larger than six-membered rings occurs to some extent. An observed dependence of abundance on configuration is associated with steric strains in the transition state. The rearrangement ions are of great diagnostic value in structural analysis. They are relatively more abundant at low electron energies and give rise to the base peak at 20 eV for many compounds. Ions produced by the competing conventional McLafferty rearrangement are less abundant.
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8.
  • 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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9.
  • Petersson, Göran, 1941 (författare)
  • Carbohydrate - related hydroxy carboxylic and dicarboxylic acids as trimethylsilyl derivatives
  • 1977
  • Ingår i: Journal of Chromatographic Science. - 0021-9665. ; 15, s. 245-255
  • Tidskriftsartikel (refereegranskat)abstract
    • Retention index and relative retention were determined for trimethylsilyl esters/ethers of approximately 170 acids and lactones. The structural categories studied were aldonic (hydroxy monocarboxylic) acids, aldaric (hydroxy dicarboxylic) acids, non - carbohydrate (mainly dicarboxylic) acids, and lactones of aldonic acids. Data are given for the silicone stationary phases OV-1 (methyl), OV-17 (50% phenyl) and QF-1 (50% trifluoropropyl). Diagrams of the retention index on the non-polar phase versus the increase in the retention index on either of the other phases are useful for qualitative analysis. The dependence of retention on structure is interpreted in terms of non-polar and polar interactions between solute and stationary phase. Structural units of the solutes are attributed retention index increments which permit predictions of retention from structure or structure from retention. The reference retention index data can be used in temperature - programmed analalysis if retentions are measured as methylene unit (MU) values. Differences between the retention index and MU concepts are discussed.
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10.
  • Petersson, Göran, 1941 (författare)
  • Conversion of dehydroascorbic acid to a branched hexaric acid in neutral and alkaline aqueous solution
  • 1976
  • Ingår i: Analytical Biochemistry. - : Elsevier BV. - 0003-2697. ; 72, s. 623-628
  • Tidskriftsartikel (refereegranskat)abstract
    • Dehydroascorbic acid is shown to be converted to 2-(threo-1,2,3-trihydroxypropyl)tartronic acid in aqueous alkaline solutions. The structure of the acid was determined by mass spectrometry of its acyclic Me3Si derivative. Mass spectrometric and chromatographic data are compared with those of related compounds. The acid is formed by a benzilic acid rearrangement of the intermediate 2,3-hexodiulosonic acid. The rate of formation at 38°C was studied quantitatively by glc. It increases at increased alkalinity but is significant even at physiological pH. The presence of oxygen does not substantially influence the reaction.
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  • Resultat 1-10 av 15
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tidskriftsartikel (15)
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refereegranskat (15)
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Samuelson, Olof, 191 ... (5)
Löwendahl, Lars, 194 ... (3)
Havlicek, Jaroslav (1)
Larsson, Kenneth (1)
Mattsson, Mary, 1945 (1)
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