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  • Analytical Chemistry and Spectroscopy  (19)
  • Inorganic Chemistry  (6)
  • Cyclodextrin derivatives  (5)
  • Cyclodextrins  (2)
  • Dynamic gas chromatography  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Massenspektrometrische Untersuchung von Analogen des Adenosins (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 262-272 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mass Spectrometry of Adenosine AnaloguesThe mass spectra of 23 trifluoroacetylated analogues of adenosine differing in the sugar moiety are investigated. The α- and β-anomers show characteristic intensity differences in the molecular ion and in the fragment ions m/e 310 and 424 (in pentose derivatives) as well as in m/e 550 and 680 (in hexose derivatives). The intensity differences can be explained by steric effects. The orientation of the hydroxyl groups does not influence the fragmentation process to such a degree that it is possible to draw systematic conclusions. For the identification of conformational isomers it is necessary to measure reference spectra. The ring size of the sugar is indicated by unique but low intensity fragments at m/e 524 and 410 (in furanosides of pentose derivatives), m/e 524 and 295 (in furanosides of hexose derivatives) as well as at m/e 508 and 433 (in pyranosides of hexose derivatives). Substitution at C-1' in hexose derivatives is indicated by ions at m/e 496 and 386.
    Notes: Die Massenspektren von 23 trifluoracetylierten Adenosin-Analoga (1-23), die sich in ihrem Zuckeranteil unterscheiden, weisen bei α- und β-Anomeren charakteristische Intensitätsunterschiede beim Molekül-Ion sowie bei den Fragment-Ionen m/e 310 und 424 (bei Pentose-Derivaten) bzw. m/e 550 und 680 (bei Hexose-Derivaten) auf. Die Intensitätsunterschiede lassen sich durch sterische Effekte erklären. Die Orientierung der Hydroxylgruppen beeinflußt die Fragmentierung nicht in dem Maße, daß eine systematische Zuordnung möglich ist. Für die Identifizierung der Konformationsisomeren ist die Aufnahme von Vergleichsspektren nötig. Die Ringgröße der Zucker ist durch das Auftreten von einzigartigen, allerdings wenig intensiven Fragment-Ionen bei m/e 524 und 410 (bei Furanosiden der Pentose-Derivate), m/e 524 und 295 (bei Furanosiden der Hexose-Derivate) und m/e 508 und 433 (bei Pyranosiden der Hexose-Derivate) erkennbar. Substitution an C-1' ist bei Hexose-Derivaten durch die Ionen m/e 496 und 386 gekennzeichnet.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050128
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  • 2
    Electronic Resource
    Electronic Resource
    Stoffwechselprodukte von Mikroorganismen, 117. L-Arginyl-D-allo-threonyl-L-phenylalanin, ein Aminosäure-Antagonist aus dem Pilz Keratinophyton terreum (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 816-825 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metabolic Products of Microorganisms, 117. L-Arginyl-D-allo-threonyl-L-phenylalanine, an Amino Acid Antagonist from the Fungus Keratinophyton terreumAn antibiotically active tripeptide was isolated from laboratory cultures of the dermatophyte Keratinophyton terreum. Inhibitory effects have been observed on fungi (Paecilomyces varioti, Mucor miehei) but not on bacteria (Bacillus subtilis, Escherichia coll). The inhibition is antagonized by L-histidine and by L-threonine. The structure was elucidated by gas chromatographic and mass spectrometric investigations and was confirmed by comparison with synthetic L-arg-DL-allo-thr-L-phe. Synthetic L-arg-L-thr-L-phe does not show antifungal activity. Conditions for the fermentation and isolation of the antibiotic are reported.
    Notes: Aus Laboratoriumskulturen eines Dermatophyten wurde eine Substanz isoliert, die Pilze (Paecilomyces varioti, Mucor miehei), nicht aber Bakterien (Bacillus subtilis, Escherichia coli) hemmt. Die antibiotische Wirkung wird durch L-Histidin und L-Threonin aufgehoben. Die Struktur des Antibioticums wurde durch gaschromatographische und massenspektrometrische Untersuchungen als L-Argnyl-D-allo-threonyl-L-phenylalanin erkannt und durch Vergleich mit dem synthetischen Tripeptid L-Arginyl-DL-allo-threonyl-L-phenylalanin bestätigt. Synthetisches L-Arg-L-Thr-L-Phe ist antifungisch inaktiv. Bedingungen für Fermentation und Gewinnung des Antibioticums werden angegeben.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060311
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  • 3
    Electronic Resource
    Electronic Resource
    Stoffwechselprodukte von Mikroorganismen, 195. Konstitution von Ophiocordin, einem Antibiotikum mit antifungischen Eigenschaften (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2221-2226 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metabolites of Microorganisms, 195. The Structure of Ophiocordin, an Antibiotic with Antifungal ActivityThe structure of the antibiotic Ophiocordin (9), which exhibits antifungal activity, was elucidated by chemical degradation, mass spectrometry, and NMR. Ophiocordin contains a novel 3-amino-hexahydro-4-hydroxyazepin system (5), which is esterified with 4-hydroxybenzoic acid and connected to 3,3′,5′-trihydroxy-2,4′-carbonylbis[benzoic acid] (7) via an amide bond between the 1-carboxy group and the amino group of the azepin system.
    Notes: Die Konstitution des antifungisch wirksamen Antibiotikums Ophiocordin (9) konnte durch chemischen Abbau, Massenspektrometrie und Kernresonanz aufgeklärt werden. Ophiocordin enthält ein neuartiges 3-Aminohexahydro-4-hydroxyazepin-System (5), an das 4-Hydroxybenzoesäure esterartig und 3,3′,5′-Trihydroxy-2,4′-carbonylbis[benzoesäure] (7) über die Carboxylgruppe in 1-Stellung säureamidartig gebunden ist.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130617
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  • 4
    Electronic Resource
    Electronic Resource
    Localization of the amide function in the sequence of peptide antibiotic trichotoxin A 40 (1982)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 9 (1982), S. 39-42 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: By treatment with trifluoroacetic acid at 37°C the octadecapeptide antibiotic complex trichotoxin A 40 could be cleaved into three homologous N-acetylated dodecapeptides and two homologous pseudohexapeptides. After separation the peptides were converted to trimethylsilylated N-ethylpolyamino alcohols and investigated by capillary gas chromatography and mass spectrometry. Mass spectrometric analysis demonstrated the presence of a glutamine residue at position 6 and of a glutamic acid residue at position 17.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200090108
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  • 5
    Electronic Resource
    Electronic Resource
    Stereochemical analysis of constituents of essential oils and flavor compounds by enantioselective capillary gas chromatography (1990)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 13 (1990), S. 328-332 
    Details
    ISSN: 0935-6304
    Keywords: Enantioselective gas chromatography ; Cyclodextrin derivatives ; Terpenoid hydrocarbons ; Chiral carbonyl compounds ; Flavor alcohols ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Modified cyclodextrins interact enantioselectively with a great variety of volatile chiral constituents of essential oils by forming diastereomeric inclusion complexes. Capillary gas chromatography is used for resolving the enantiomers of terpenoid hydrocarbons (camphene, α-pinene, limonene, α-phellandrene), carbonyl compounds (carvone, fenchone, menthone, isomenthone, piperitone, camphor, myrtenal), and alcohols (trifluoroacetylated β-citronellol, myrtenol, trans-pinocarveol, 1-octen-3-ol, and underivatized linalool). The enantiomeric composition of some of these compounds in a variety of essential oils is investigated.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240130507
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  • 6
    Electronic Resource
    Electronic Resource
    Gas chromatographic enantiomer separation of agrochemicals and polychlorinated biphenyls (PCBs) using modified cyclodextrins (1994)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 17 (1994), S. 859-864 
    Details
    ISSN: 0935-6304
    Keywords: Enantioselective gas chromatography ; Cyclodextrin derivatives ; Polychlorinated pesticides ; Polychlorinated biphenyls (PCBs) ; Pyrethroid insecticides/Allethrin ; Organophosphorus pesticides/Acephate, Malaoxon ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The enantiomers of the polychlorinated polycyclic xenobiotics heptachlor, cis- and trans-chlordane, cis- and trans-heptachlorepoxide, oxychlordane, and bromocyclen have been resolved by gas chromatography with selectively substituted cyclodextrins. The order of elution of these compounds and of α-hexachlorocyclohexane (α-HCH) was determined by comparison with enantiomerically enriched reference compounds obtained by preparative enantioselective gas chromatography.A separation of the eight stereoisomers of the pyrethroid insecticide allethrin into seven peaks was achieved. Both trans-diastereomers were separated into their enantiomers and the order of elution could be determined by comparison with commercially available (S)-bioallethrin and trans-bioallethrin. Also one cis-diastereomer was separated, wheras the other cis-isomer could not be resolved. In addition 15 out of 19 stable atropisomeric polychlorinated biphenyls with 5, 6 and 7 chlorine substituents, some chiral organophosphorus pesticides, including acephate and malaoxon and the herbicide bromoacil were separated.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240171209
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  • 7
    Electronic Resource
    Electronic Resource
    Separation of basic drugs by capillary electrophoresis using selectively modified cyclodextrins as chiral selectors (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 7 (1995), S. 355-363 
    Details
    ISSN: 1040-7685
    Keywords: basic drugs ; capillary electrophoresis ; cyclodextrin derivatives ; separation of enantiomers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The influence of seven differently methylated β-cyclodextrin derivatives and of pure β-cyclodextrin (β-CD) on the enantiomeric resolution by capillary electrophoresis of six basic chiral pharmaceuticals is investigated. The methyl substitution pattern affects enantioselectivity much more than other experimental parameters. The purity of the used cyclodextrin derivatives is analyzed by successive hydrolysis, reduction, acetylation, and GC/MS of each CD derivative and by MALDI-TOF mass spectrometry. © 1995 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220070408
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  • 8
    Electronic Resource
    Electronic Resource
    Diluted versus undiluted cyclodextrin derivates in capillary gas chromatography and the effect of linear carrier gas velocity, column temperature, and length on enantiomer separation (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 5 (1993), S. 35-40 
    Details
    ISSN: 1040-7685
    Keywords: Enantiomers ; gas chromatography ; cyclodextrin derivatives ; temperature dependence ; capillary columns ; selectivity ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The effect of dilution of the chiral stationary phase octakis (3-O-butyryl-2, 6-di-O-pentyl)-γ-cyclodextrin in the achiral polysiloxane OV-1701 on the separation factor was investigated over a wide concentration range. The loss in enantioselectivity was only negligible down to a dilution of 50% (w/w), since the separation factor vs. concentration curves levels off at higher concentrations. Because of the strong temperature dependence of the separation factors, the properties of short columns (10 m and 4.5 m) were evaluated. These short columns, which allow operation at low temperatures and lead to enhanced separation factors were found to be appropriate for the separations of simple mixtures, because the gain in selectivity exceeded the loss in separation efficiency. For complex mixtures, the higher efficiencies of columns of at least 25 m in length were still necessary. A plot of In α vs. 1/T did not yield straight lines, but showed a significant curvature, leading to considerable relative errors if thermodynamic data were derived from these plots.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220050105
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  • 9
    Electronic Resource
    Electronic Resource
    Unusual retention behavior of methyl lactate and methyl 2-hydroxybutyrate enantiomers on a modified cyclodextrin (1991)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 14 (1991), S. 694-695 
    Details
    ISSN: 0935-6304
    Keywords: Enantioselective gas chromatography ; Reversal of elution order ; Isoenantioselective temperature ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240141013
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  • 10
    Electronic Resource
    Electronic Resource
    Gas chromatographic enantiomer separation of agrochemicals using modified cyclodextrins (1991)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 14 (1991), S. 530-536 
    Details
    ISSN: 0935-6304
    Keywords: Capillary gas chromatography ; Heptakis(2-O-methyl-3,6-di-O-pentyl)-γ-cyclodextrin ; Mixed cyclodextrin derivatives ; Phenoxypropionic acid herbicides ; Polychlorinated pesticides ; Enantiomer separation of chlordane ; Organophosphorus pesticides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The enantiomers of phenoxypropionic acid type herbicides have been resolved by capillary gas chromatography employing modified cyclodextrins as chiral stationary phases. Excellent separations were obtained with columns containing a 1:1 mixture of per-O-pentylated and per-O-methylated γ-cyclodextrin.The enantiomers of the methyl esters of mecoprop and dichlorprop were also resolved on octakis(3-O-butyryl-2,6-di-O-pentyl)-γ-cyclodextrin. On this phase the order of elution of the enantiomers was temperature-dependent, the elution order being reversed as the temperature passed through the isoenantioselective temperature. This is the first time such behavior has been observed with cyclodextrin derivatives.The enantiomers of the polychlorinated polycyclic pesticides cis- and trans-chlordane, oxychlordane, heptachlor, heptachlorepoxide, and three chiral organophosphorus pesticides could be resolved using selectively derivatized cyclodextrin derivatives.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240140804
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