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  • 1
    Electronic Resource
    Electronic Resource
    Supercritical fluid extraction and supercritical fluid chromatography of the fungal metabolite ergosterol (1993)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 41 (1993), S. 577-581 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf00028a014
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Supercritical fluid extraction of carboxylic and fatty acids from Agaricus spp. mushrooms (1994)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 42 (1994), S. 718-722 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf00039a023
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ion mobility spectrometry as a detection technique for the separation sciences (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 561-566 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The development of a high temperature ion mobility, spectrometer is described for interfacing to chromatographic techniques, in particular, gas chromatography and high-performance liquid chromatography. The performance of the system is assessed by measuring ion mobility constants for both positive and negative ions. The sensitivity of the detector was determined and found to allow the detection of trace components down to tens of picogrammes (pg) for halogenatcd compounds, in the negative-ion mode of operation. Standard mixtures of potychlorinated biphenyls (PCBs) were studied by gas chromatography/ion mobility Spectrometry with the aim of quantitating extracts of soil samples. A novel method of interfacing to liquid chromatography has been evaluated using a membrane separator of large surface area and high efficiency for removing the mobile phase. Preliminary data for liquid chromatocraphy/ion mobility spectrometry is reported.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070632
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  • 4
    Electronic Resource
    Electronic Resource
    The use of amine base to enhance the sensitivity of electrospray mass spectrometry towards complex polysulphonated azo dyes (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 1403-1410 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Electrospray ionization mass spectrometry was employed in the detection of polysulphonated azo dye sodium salts, and other compounds containing the sulphonate-sodium ion group [SO3- +Na]. Before amine addition, the polysulphonated azo dyes produced low intensity ions. Spectra were obtained in both positive- and negative-ionization modes, the negative mode giving the best results. The typical spectrum of a dye depended on the number of cations associated to the compound. Each compound displayed a series of ion peaks which were the result of varied amount of cation-proton exchange during the ionization process. The number of protons observed to bind to a compound anion with (n) sodium cations simultaneously removed depended on the charge (z) carried by each ion within an ion series. We have found that the addition of an amine base sensitizes polysulphonated azo salts towards electrospray ionization mass spectrometry. We propose that the addition of the amine base assists the total removal of cations. This selectively enhances the intensity of the acid ion peaks of each ion series, by accumulating each peak present within z-charged ion series into a single intense peak. The percentage increase in the intensity of the acid ion peaks was observed in most cases to follow the gas-phase proton affinity of the applied amine base. Preliminary results have also indicated that a correlation exists between the percentage increase in the intensity of acid ion peaks and the number of cations originally associated to each compound.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290091417
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  • 5
    Electronic Resource
    Electronic Resource
    An investigation into the stereochemistry of the boronate di-esters of some monosaccharides using tandem mass spectrometry (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 1099-1107 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The aim of this work was to probe the stereochemistry of a series of monosaccharides. Firstly, the underivatized sugars were investigated using linked-scans and tandem mass spectrometry on a ‘hybrid’ instrument (hybrid MS/MS) and secondly, a comparison of linked-scan and hybrid MS/MS was carried out on the butyl and phenyl boronate di-esters. In situ derivatization of the sugar to the boronate di-ester allows a negative-ion fast-atom bombardment (FAB) investigation with greater sensitivity than for the underivatized sugar. The linked-scan data allow a great deal of information on the structure and chemistry of the sugars to be obtained, but the sensitivity at lower mass is limited. The hybrid MS/MS data give similar fragmentation information, plus improved sensitivity at lower molecular weight.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071209
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  • 6
    Electronic Resource
    Electronic Resource
    Proton-transfer reactions of mass-selected multiply charged ions (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 417-422 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A triple-quadrupole spectrometer has been used to study proton-transfer reactions of multiply charged ions generated by electrospray ionization. Doubly and triply charged ions generated from the peptides Arg-Lys-Glu-Val-Tyr and Met-Lys-bradykinin, respectively, were found to undergo proton-transfer reactions with ammonia molecules contained in the RF-only quadrupole collision-gas cell of the spectrometer. With horse-heart myoglobin in the source, ions having charges of 20+, 19+, 16+ and 14+ were selected in turn by the first quadrupole and their proton-transfer reactions with ammonia investigated. For each ion, numerous product ions were detected having charges (n-1)+, (n-2)+, (n-3)+ … where n was the charge on the reacting parent ion. The possibility of using the experimental technique to measure approximately the proton affinities of multiply charged ions is discussed. Also, a procedure is outlined for identifying the charge states of product ions resulting from collision-induced dissociation of multiply charged ions.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080515
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  • 7
    Electronic Resource
    Electronic Resource
    The complexation and chiral selectivity of 2-hydroxypropyl-β-cyclodextrin with guest molecules as studied by electrospray mass spectrometry (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 423-426 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Electrospray mass spectrometry has been used to study the complexation of ‘guest’ molecules with a mixture of hydroxypropyl-substituted β-cyclodextrin derivatives. In all cases studied, the predominant derivative was shown to contain a maximum of seven hydroxypropyl groups, most probably related to alkylation of each of the seven glucose units of the parent β-cyclodextrin. Chiral selectivity was not observed for D- and L-phenylalanine methyl esters. In contrast D-propranolol and L-tryptophan methyl ester formed stronger complexes than the corresponding L- and D-enantiomers, respectively. Molecular modelling studies were also carried out, in an attempt to identify the factors that can play a part in determining the mechanism of the observed non-covalent interactions.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080516
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  • 8
    Electronic Resource
    Electronic Resource
    Chromatographic and mass spectrometric methods for the identification of phosphorylation sites in phosphoproteins (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 559-570 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The phosphorylation sites in a model phosphoprotein, αsl-casein from bovine milk, have been identified by tryptic peptide mapping (Gibson and Cohen, Methods Enzymol. vol. 193, p. 480 (1990)) employing reversed-phase high performance liquid chromatography (RPHPLC)/electrospray ionization mass spectrometry (ES-MS); by infusion tandem mass spectrometry (MS/MS) and LC/MS/MS in neutral loss mode of tryptic digests of αsl-casein, in which the characteristic neutral loss of phosphoric acid by phosphopeptides under collision-induced dissociation (CID) conditions is exploited to highlight phosphopeptides in a tryptic digest (Covey et al., in Methods in Protein Sequence Analysis, Jörnvall et al. (Eds), Birkhäuser Verlag, Basel 1991), and by a novel method, termed LC/CID-MS, in which phosphopeptides are located in mixtures of peptides by the generation and detection of phosphate-specific fragment ions during LC/ES-MS (Huddleston et al., J. Am. Soc. Mass Spectrom. vol. 4, p. 710 (1993)). An appraisal of the efficiency, sensitivity and practicality of each of these methods in the identification of phosphorylation sites in post-translationally modified proteins is given.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080713
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  • 9
    Electronic Resource
    Electronic Resource
    Evaluation of glycosylation site heterogeneity and selective identification of glycopeptides in proteolytic digests of bovine α1-acid glycoprotein by mass spectrometry (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 42-56 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Glycosylation sites in bovine α1-acid glycoprotein (AGP) have been identified, and the inherent heterogeneity evaluated, by capillary electrophoretic and reversed-phase liquid chromatography/electrospray-mass spectrometric analyses of proteolytic digests of this glycoprotein. The success of these methods in locating glycopeptides relied on significant heterogeneity within each glycosylation site. In order to rapidly locate sites in glycoproteins of any degree of heterogeneity, a novel mass spectrometric method was applied to selectively identify the glycopeptides in a proteolytic digest of bovine α1-AGP. The glycopeptides were selectively located by the generation and detection of characteristic oxonium ions from the carbohydrate moieties by collision-induced dissociation (CID) during liquid chromatography/electrospray-tandem mass spectrometry, and liquid chromatography/CID mass spectrometry, in which fragmentation was induced in the supersonic expansion region of the electrospray source.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290090111
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Development of packed capillary column electrochromatography/mass spectrometry (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 544-548 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The enhanced performance of electro-osmotically driven high performance liquid chromatography (HPLC) using reversed-phase packed capillaries has been evaluated for coupling to mass spectrometers, as an alternative to both conventional pressure-driven elution, and to micellar electrokinetic capillary chromatography for the separation of neutral analytes. An off-line comparison of electro-osmotically driven versus pressure driven chromatography for the separation of an aromatic mixture shows the superiority of the method over conventional HPLC. Coupling of the technique with continuous-flow fast-atom bombardment for the analysis of a steroid mixture is described.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080711
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