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  • 1
    Electronic Resource
    Electronic Resource
    New Stationary Phase Prepared by Immobilization of a Copper-Amine Complex on Silica and Its Use for High Performance Liquid Chromatography (1999)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 22 (1999), S. 103-108 
    Details
    ISSN: 0935-6304
    Keywords: HPLC ; stationary phase ; copper-amine complex ; aromatic amines ; polyaromatic hydrocarbons ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Chromatographic silica (10 μm) was chemically modified with the silylating agent: [3-(2-aminoethyl)aminopropyl]trimethoxysilane (AEAPTS). The reaction product was characterized by elemental analysis and infrared and 13C and 29Si NMR spectra. The chemically modified silica was treated with Cu(II) in methanol medium. This cation was strongly adsorbed through complexation by the pendant ethylenediamine groups attached to the silica surface. The complex formed on the silica surface was shown to be stable in both aqueous and non-aqueous media. The aim of Cu(II) immobilization is to use this new material as a stationary phase in High Performance Liquid Chromatography (HPLC). Separations of synthetic mixtures of aromatic amines and of polyaromatic hydrocarbons were undertaken using 150×3.9 mm HPLC columns packed with the modified silica, with and without copper ions, to follow the influence of the cation on the chromatographic separation and to verify the efficiency of the new stationary phase for HPLC.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Separation of nitroaromatics by micellar electrokinetic capillary chromatography (1992)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 15 (1992), S. 198-200 
    Details
    ISSN: 0935-6304
    Keywords: Micellar electrokinetic capillary chromatography ; Capillary electrophoresis ; Nitroaromatics ; 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.1240150313
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  • 3
    Electronic Resource
    Electronic Resource
    A spectroscopic study of pigment gallstones in China (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 3 (1997), S. 371-380 
    Details
    ISSN: 1075-4261
    Keywords: brown pigment stone ; PAGE ; mid-IR spectroscopy ; far IR spectroscopy ; FT-Raman ; bezoar ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Spectroscopic studies of various types of gallstones carried out in China are reviewed. Three basic classes of gallstones are surveyed: cholesterol stones, brown pigment stones, and black pigment stones. The emphasis of this review is on brown gallstones. The primary spectroscopic methods used in the studies surveyed are Fourier transform infrared absorption and Fourier transform Raman scattering. Chemical components studied in gallstones include cholesterol, bile pigments, glycoproteins, proteins, bilirubin metal complexes, and salts of calcium and other metals. Further studies are needed characterize the relationship of these components to more complex features of gallstones. © 1997 John Wiley & Sons, Inc. Biospectroscopy 3: 371-380, 1997
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Mass spectral studies on methyl and picolinyl ester derivatives of isomeric selena fatty acids (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 21 (1992), S. 505-508 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Methyl and picolinyl ester derivatives of isomeric selenalaurates have been characterized by gas chromatography/mass spectrometry. The methyl and picolinyl ester deterivaties give electron impact mass spectra in which ions formed by cleavage at the selenium atom and containing the selenium atom are especially distinctive. The molecular ion (M+) of the methyl ester derivatives was prominent, but not in the case of the picolinyl ester derivatives. Methyl 2-, 3-, 4- and 5-selenalaurate furnished unique mass spectra, which permitted the location of the selenium atom in these isomers. The position of the selenium atom in the 6- to 11-selenalaurate isomers was readily determined from mass spectral results obtained from the picolinyl ester derivatives.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200211007
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  • 5
    Electronic Resource
    Electronic Resource
    Mass spectrometry of derivatives of isomeric allenic fatty acids (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 21 (1992), S. 267-270 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electron impact mass spectra have been obtained for isomeric C14 and C18 allenic fatty acids in the form of the methyl and picolinyl ester derivatives. When the allene moiety was in positions 3 to 9, the mass spectra of the methyl esters gave spectra with diagnostic ions that appeared to be formed by beta cleavage on the distal side of the molecule; otherwise hydrocarbon ions were dominant. With the picolinyl ester derivatives, distinctive fragmentations beta to the allene moiety on each side were observed for each isomer.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200210508
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  • 6
    Electronic Resource
    Electronic Resource
    Fast atom bombardment mass spectrometry of Solanum glycoalkaloids and its potential for mixture analysis (1985)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1985), S. 79-85 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The positive ion fast atom bombardment mass spectra of ten glycoalkaloids and five related alkaloids are reported. The spectra of the glycoalkaloids are characterized by abundant [M + H]+ species and fragment ions, resulting from cleavage of the individual carbohydrate groups. Several of these ions have been observed to be diagnostic for individual glycoalkaloids and have allowed the analysis of mixtures of standards as well as crude extracts of potato peel and sprout.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200120206
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  • 7
    Electronic Resource
    Electronic Resource
    Mass spectral characterization of picolinyl and methyl ester derivatives of isomeric thia fatty acids (1991)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 20 (1991), S. 629-635 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Picolinyl and methyl ester derivatives of all the isomeric thialaurates and thiastearates, together with some dithiastearates, have been characterized by gas chromatography/mass spectrometry. The picolinyl ester derivatives give simple electron impact mass spectra in which ions formed by cleavage at the sulphur atom and containing the sulphur atom are especially distinctive. The methyl ester derivatives have much more complex mass spectra, again dominated by ions formed by cleavage at the sulphur atoms, although all possible fragments are seen. With both derivatives, the spectra are readily interpretable in terms of the positions of the sulphur atoms. The position of the sulphur atom can also have a marked effect on the abundance of the McLafferty rearrangement ion.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200201007
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  • 8
    Electronic Resource
    Electronic Resource
    EXAFS and FTIR studies on the binding of deoxycholic acid with copper and zinc ions (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 1 (1995), S. 291-296 
    Details
    ISSN: 1075-4261
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Deoxycholic acid is an important physiological bile acid. The binding of bile salts with metal ions has received more attention due to its clinical significance. In this study, a series of copper and zinc deoxycholate complexes were synthesized. EXAFS and FTIR spectroscopic techniques were used for characterization. The results indicated that both the carboxyl and hydroxyl groups of deoxycholic acid are binding to the Cu (or Zn) ion to form a new complex. There are six oxygen atoms surrounding the metal ion with the average bond lengths of Cu-O and Zn-O are 1.95 and 2.06 Å respectively. © 1995 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bspy.350010407
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  • 9
    Electronic Resource
    Electronic Resource
    The resonantly enhanced of two-photon ionization and electron ionization of trypyophan molecules in beams formed by laser evaporation of aqyeous cryogenic matrix (1991)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 5 (1991), S. 257-259 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The mass spectra resulting from election ionization and resonantly enhanced two-ionization of amino acid trytophan molecules evaporated by the first harmonic frequency of a Nd-YAG laser from an aqueous crygenic matrix were obtianed. The resonantly enhanced two-photon spectra in the region of 0-0 origin bands of tryptophan conformers was also measured.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290050602
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  • 10
    Electronic Resource
    Electronic Resource
    Characterization of metabolites of Δ8,9-dehydroestrone in dogs (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 1505-1511 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Δ8,9-Dehydroestrone is the fifth most abundant component in the conjugated equine estrogen preparation Premarin®, representing about 2 to 6% of the total steroids in the tablet. The metabolism of this estrogen has been determined in female beagle dogs after acute peroral administration. 17β-Dihydro-Δ8,9-dehydroestrone(17β-Δ8,9-dehydroestradiol) and 17α-dihydro-Δ8,9dehydroestrone(17α-Δ8,9-dehydroestradiol) have been identified as the major metabolites in plasma and urine. These metabolites, along with the unchanged drug, were isolated and purified by ether extraction and thin-layer chromatography of the urine samples after enzyme hydrolysis. The trimethylsilyl ether derivatives of the isolated metabolites were characterized by comparison of their mass spectra and chromatographic properties with those of synthetic reference standards.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190301017
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