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  • 1995-1999  (378)
  • 1980-1984  (777)
  • 1900-1904
  • Analytical Chemistry and Spectroscopy  (1,155)
  • 1
    Electronic Resource
    Electronic Resource
    Sequencing electroblotted proteins by tandem mass spectrometry (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 1051-1055 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Electroblotting proteins separated by gel electrophoresis provides a suitable support for further manipulations and analysis of small amounts of relatively pure samples. On-membrane digestion, peptide mapping by mass spectrometry, and database searching offer sensitive and fast tools to identify the analyte. By providing sequence information, tandem mass spectrometry can go a step further, confirming the database identification, solving problems connected with post-translational modifications and sequence variations, or supplying the stretches of internal sequence necessary to synthesize an oligonucleotide probe for gene isolation. The viability of this approach was successfully evaluated using different tandem mass spectrometric techniques: metastable decomposition in a matrix-assisted laser desorption/ionization (MALDI) time-of-flight instrument with a curved-field reflectron; low energy collision-induced dissociation in a MALDI quadrupole ion trap mass spectrometer; and high energy collision-induced dissociation in a high-performance four-sector mass spectrometer with massive cluster-impact ionization.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290091116
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High temperature silylation of glass capillary columns (1980)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 3 (1980), S. 337-344 
    Details
    ISSN: 0935-6304
    Keywords: Gas Chromatography ; Capillary, glass ; Surface deactivation ; High temperature silylation ; Applications ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This paper describes the results of a study on the deactivation of the surface of glass capillary columns by high temperature silylation (HTS). The different steps, leaching, washing, dehydration and HTS were optimized. A practical procedure yielding a high percentage of very good columns is given. The influence of leaching and HTS on the temperature stability and coating efficiency of capillary columns coated with OV-1 was studied. The inertness of the glass surface after HTS is demonstrated by several examples.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240030706
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A rapid method for quantitative analysis of lead sulfate in the manufacturing control of lead acid batteries (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 712-713 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Ion-Pair, reverse phase ; Sulfate analysis ; Lead acid batteries ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240071212
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Evidence suggesting the occurrence of [2+3] cycloaddition products in the ion/molecule reactions of suitably substituted allyl cations and olefins (1980)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 15 (1980), S. 152-156 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ion/molecule reactions of allyl cations and 2-methoxyallyl cations with vinyl methyl ether, 1-chloro-2-ethoxyethene and 1,2-dimethoxyethene are discussed in terms of [2+3] cycloaddition reactions. Deuterium labelling of the cations has been used for the study of the reaction mechanisms. The appearance of various product ions in these ion/molecule reactions lead to the suggestion that in reactions of allyl cations with alkenes non-cyclic [C5H5]+ product ions are formed preferentially, but that in reactions of 2-methoxyallyl cations with alkenes a significant part of the product ions are methoxycyclopentadienyl cations. These observations are ascribed to the stabilizing effect of the methoxy group with regard to the positive charge in the product ions.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210150311
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Substituent effects on one-bond 15N—13C couplings in N,N-dimethylanilines and nitrobenzenes. Effect of steric inhibition of conjugation (1982)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 20 (1982), S. 11-15 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1J(15N13C) values for a series of ring-substituted N,N-dimethylaniline-15N derivatives and a series of nitrobenzene-15N derivatives were measured from the 13C spectra. In the nitrobenzenes, small changes in 1J(15N13C) are attributed to the inductive effect of the substituents, since steric inhibition of conjugation has little effect on the magnitude of the coupling. In contrast, steric inhibition of nitrogen lone-pair delocalization in N,N-dimethylaniline derivatives markedly reduces the value of 1J(15N13C). Theoretical calculations of 1J(15N13C) values for the two series of compounds were made using standard INDO parameters and a ‘sum-over-states’ perturbation approach. Fair agreement between the calculated and experimental values is found.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270200104
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Quantitative evaluation of thin-layer chromatograms. 5. Calculation of reflectance and transmission using Markov chains (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 141-142 
    Details
    ISSN: 0935-6304
    Keywords: TLC ; Reflectance ; Transmission ; Probability vector ; Transition matrix ; Markov chains ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Changes of reflected and transmitted light in cases where a band lies in different sublayers of a thin-layer chromatogram are calculated by the use of Markov chains. The problem of a “random walk with absorbing barriers” is described and compared with the problem of transmission and reflectance of light in a layer of sorbent.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040315
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Odour evaluation, fraction collection and preparative scale separations with glass capillary columns (1980)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 3 (1980), S. 107-114 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Two-dimensional GC ; Odour evaluation ; Fraction collection, heart-cutting and enrichment ; Applications, essential oil analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple but effective GC approach to odour evaluation and fraction collection with capillary columns is described. An allglass device splits the column effluent, with one splitter arm going to an FID. For odour evaluation, the other splitter arm is led via teflon tubing to the nose. Off-line heart-cutting is carried out by collecting the split effluent on a glass capillary microtrap, the inner walls of which are coated with OV-101. This allows recovery of nanogram amounts of material. Multipass operation or repeated collection leads to preparative capillary GC for further spectroscopic investigation. These techniques do not involve sophisticated equipment or valves. Applications of this type of smell analysis, heart-cutting and enrichment in the analysis of Rhododendron fragrantissimum essential oil, black pepper essential oil and hop essential oil, illustrating the versatility of the systems, are presented.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240030302
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    A new method for the quantitative analysis of organochlorine pesticides and polychlorinated biphenylsPaper presented at the Second European Symposium on Analysis of Organic Micropollutants in Water Killarney (Ireland), November 1981. (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 75-79 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary ; SD-E enrichment ; Pesticide residues ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple method is described for the quantitative determination of organochlorine pesticides and polychlorinated biphenyls (PCB's) in water at the sub-ppb level. A micro gas-phase extractor advantageously replaces other preconcentration and purification techniques. The extract is analyzed by capillary gas chromatography without further enrichment. The recovery at the ppb level was nearly 100% for organochlorine pesticides and more than 80% for PCB's. The complete procedure including sample preparation, steam distillation-extraction, and capillary gas chromatographic analysis is carried out in less than four hours.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240050203
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Quantitative evaluation of thin-layer chromatograms. 3. The calculation of fluorescence using multilayer models (1980)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 3 (1980), S. 183-188 
    Details
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography ; Quantitation (theory, practice) ; Effect of substance distribution within layer on quantitative data ; Secondary chromatography effects responsible for most of error sources ; Fluorodensitometry ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Changes of fluorescence intensity at the far side (transmission) and near side (remission) in cases where a spot of a fluorogen lies in different sublayers are calculated using a multilayer model. Examples shown are: the relative intensity of fluorescence in the layer as a function of the absorption coefficient of a sorbent at the excitation wavelength; the relative intensity of fluorescence at the far and near sides of a TLC plate; the influence of using too broad a monochromatic filter at the emission side on the results of fluorescence measurements. Advantages of near-side scanning of fluorescence compared to far-side scanning are discussed. The most important source of errors in fluorodensitometric measurements is the effect of secondary chromatography.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240030408
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  • 10
    Electronic Resource
    Electronic Resource
    Quantitative densitometric determination of reserpine and ajmaline in Rauwolfia Vomitoria by HPTLC (1980)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 3 (1980), S. 149-150 
    Details
    ISSN: 0935-6304
    Keywords: HPTLC ; Rel. quantitative alkaloid determination ; 5% standard deviation in adsorption mode ; 3% standard deviation in fluorescence mode ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A direct densitometric method for the quantitative measurement of reserpine and ajmaline in whole roots and bark of roots of Rauwolfia Vomitoria, after extraction and separation by thin-layer chromatography, is described. The emission and excitation spectra of the reserpine and the absorption spectrum of the ajmaline were scanned. The linear range between peak area and concentration is given.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240030311
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    Paper (German National Licenses)
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