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  • Analytical Chemistry and Spectroscopy  (9)
  • DNA aggregate  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Electron ionization-tandem mass spectrometry of glycosphingolipids. Part II. The identification of a carbohydrate sequence corresponding to a novel repetitive blood group a heptaglycosylceramide (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 421-426 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: In a previous paper, the presence in human kidney vein tissue of a novel blood group A heptaglycosylceramide based on the type-3 carbohydrate chain GalNAcαl-3(Fucαl-2)Galα1-3GalNAcαl-3(Fucα1-2)Galβl-4Glcβl-1 Ceramide, was suggested based on thin-layer immunostaining and electron ionization mass Spectrometry. Ions corresponding lo a structure containing two deoxyhexoses, two hexosamines and three hexoses were identified, but no information was obtained from mass spectrometry concerning the carbohydrate sequence5. In the present paper, we report the identification of carbohydrate sequence ions corresponding to a type-3 chain A heptaglyco-sylceramide by electron ionization-tandem mass spectrometry of a permethylated-reduced glycosphingolipid mixture isolated from human kidney vein tissue. The use of a microchannel-plate-array detector increased the sensitivity for collision-induced dissociation spectra by a factor of at least ten over a conventional electron multiplier.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070604
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  • 2
    Electronic Resource
    Electronic Resource
    Low-energy ion/molecule products from collisions with ammoniaNRCC No. 34888. (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 1136-1140 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Multiple clustering of ammonia molecules to triply protonated bovine insulin B chain has been observed in a novel collision cell incorporated as part of a triple quadrupole mass spectrometer. The nature of the phenomenon was examined as a function of both the collision energy and the collision gas thickness in the cell. Increased clustering was observed with higher collision-gas thickness and lower collision energy. Initial experiments indicate that the number of ammonia molecules clustering to the precursor ion may be dependent on the number of available acidic sites.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071216
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  • 3
    Electronic Resource
    Electronic Resource
    Fluorescence resonance energy transfer visualization of DNA aggregates formed during electrophoretic separations in ultradilute hydroxyethylcellulose (1996)
    Weinheim : Wiley-Blackwell
    Electrophoresis 17 (1996), S. 1110-1114 
    Details
    ISSN: 0173-0835
    Keywords: Capillary electrophoresis ; Hydroxyethylcellulose ; Energy transfer ; DNA aggregate ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Fluoresence resonance energy transfer (FRET) microscopy is used to observe structures of DNA aggregates formed during electrophoresis in ultradilute hydroxyethylcellulose (HEC). FRET gives evidence of aggregates with a tightly packed core and random entanglement of DNA in the outer portions. HEC concentrations also appear to play a role in aggregate formation. DNA aggregates take longer to assemble in higher HEC concentration solutions and assume a less compact form than those formed at lower HEC concentrations.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150170621
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis of Bacitracin B using fast atom bombardment and tandem mass spectrometry (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1993), S. 712-720 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bacitracin is a mixture of polypeptide antibiotics produced by the action of Bacillus subtilis and Bacillus licheniformis. The mixture has previously been shown to contain at least ten components, of which only the major component, Bacitracin A, and its oxidized counterpart, Bacitracin F, have been fully structurally evaluated. Using fast atom bombardment ionization with tandem mass spectrometry, three isobaric components of one of the minor constituents of the mixture, Bacitracin B, have been structurally characterized, delineating the three single substitution sites within Bactitracin A where Ile has been replaced by Val.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200221208
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  • 5
    Electronic Resource
    Electronic Resource
    Fragmentation mechanisms of protonated actinomycins and their use in structural determination of unknown analoguesNRCC No. 38088. (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 1111-1125 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A combination of mass shifts arising from known structural variations of neutral precursors, and accurate mass measurements of key fragment tions, has led to a proposed systematization of the low-energy fragmentation mechanisms for MH+ ions of actinomycins. These rationalizations are used in a predictive manner to interpret fragment ion spectra, of unknown impurities in actinomycin standards, in terms of structure. Both the strengths and limitations of this approach are emphasized. This work has uncovered actinomycin variants in which one of the threonine residues is substituted by serine, a structural variation which does not appear to have been reported previously.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190300808
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  • 6
    Electronic Resource
    Electronic Resource
    Primary structural confirmation of components of the bacitracin complexNRCC no. 34887. (1994)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1994), S. 61-70 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The bacitracin antibiotic peptide complex has been analyzed using liquid chromatography in conjunction with ion spray tandem mass spectrometry and multiple reaction monitoring techniques. Fragmentation patterns were determined from the product ion spectrum of bacitracin A (mol. wt 1421.8 Da), a compound of well-established structure. Primary structural information has been determined for seven minor components of the bacitracin complex with regard to the extent of amino acid substitution taking place.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200230204
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  • 7
    Electronic Resource
    Electronic Resource
    Non-ideal behavior in analyte velocity modulation capillary electrophoresis (1990)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 13 (1990), S. 587-589 
    Details
    ISSN: 0935-6304
    Keywords: Capillary electrophoresis ; Analyte velocity modulation ; Anomalous sample behavior ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240130817
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  • 8
    Electronic Resource
    Electronic Resource
    Mass spectra of doubly charged ions (1989)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 24 (1989), S. 504-510 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of biological molecules, whose molecular mass exceeds 10 kDa, invariably contain multiply charged ions. For example, a survey scan of a small protein will produce singly, doubly and triply protonated molecules, the intensity of the doubly charged species often being greater than that of the singly charged entity. Although the spectra resulting from doubly charged peptides have not previously been studied, collisional activation of such doubly charged species may result in significant additional information pertaining to molecular structure. The techniques employed to study ions originating from multiply charged species were linked scanning of constant B/E and tandem mass spectrometry, namely low collision energy spectra acquired on a BEQQ hybrid instrument. The methodology was applied to model compounds whose tandem mass spectrometry characteristics are well known, e.g. gramicidin S and angiotensin I. The results for the product ions of the [M + 2H]2+ species of the models were obtained which highlight the methodology required for high-mass materials.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210240711
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  • 9
    Electronic Resource
    Electronic Resource
    Characterization of the flavin-protein interaction in L-Lactate oxidase and old yellow enzyme by resonance inverse Raman spectroscopy (1987)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 18 (1987), S. 241-245 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Resonance inverse Raman spectroscopy was used to examine the interactions between the flavin and surounding protein in L-lactate oxidase (from Mycobacterium smegmatis) and Old Yellow Enzyme (from brewer's bottom yeast). Spectra were taken of the enzymes both free and bound to various ligands. For L-lactate oxidase, the ligands consisted of substrate analogs (acetate, propionate) and inorganic anions (phosphate, sulfate and nitrate). For the inorganic anions, the expected attenuation with detuning was not observed for several bands which are associated with flavin rings II and III. This effect appears to be due to a disruption of ring stacking between the uracil-pyrazine end of the flavin moiety and an aromatic amino acid. A shift in the 1232 cm-1 band and changes in the bandwidths of bands in the 1450-1600 cm-1 region indicate minor reorganization of the hydrogen bonding structure around the isoalloxazine on ligand binding.For Old Yellow Enzyme, the ligand was chloride. Chloride caused a slight change to the Raman spectrum, indicative of decreased hydrogen bonding to the flavin.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250180403
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  • 10
    Electronic Resource
    Electronic Resource
    Inverse Raman spectroscopy of bilirubin and its ditauride (1984)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 15 (1984), S. 288-292 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The inverse Raman spectrum of bilirubin and bilirubin ditauride were measured under pre-resonant conditions. Spectra in chloroform and dimethyl sulfoxide were assigned by comparison with model compounds and on the basis of the known effects of the solvents on the internal hydrogen bonding in bilirubin. The band assignments were used to interpret the spectra of bilirubin ditauride in aqueous solution. Evidence is presented for strong hydrogen bonding to the pyrrole N—H bonds and to the lactam rings. It is proposed that hydrogen bonding to water is facilitated by photoactivation and, in turn, stabilizes photohiliruhin.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250150416
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