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  • 1
    Electronic Resource
    Electronic Resource
    Determination of tryptamine in brain tissue by capillary gas chromatography mass spectrometry (selected ion monitoring) (1984)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1984), S. 142-144 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The development of an analytical method for the determination of brain tryptamine using capillary gas chromatography mass spectrometry (selected ion monitoring) is presented. The method involves solvent extraction of brain homogenates and further derivatization (pentafluoropropionyl derivatives) of the dried extracts. Gas chrmatographic analysis is performed using a bonded phase silica fused capillary column. Selected monitoring of M/z 289 and 292 (isotope dilution technique) allows the determination of tryptamine in adult rat brain (450 ± 73 pg g-1) (X ± SEM), n = 6.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200110309
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  • 2
    Electronic Resource
    Electronic Resource
    Two-dimensional NMR studies of cyperene (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 308-311 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Combined utilization of 1H—1H homonuclear and 1H—13C heteronuclear NMR chemical shift correlations, two-dimensional J-resolved 1H NMR measurements and homonuclear 1H double resonance experiments allowed specific assignments for both 1H and 13C NMR frequencies to be made for the tricyclic sesquiterpene cyperene. The results also provided information on the conformation of the six-membered ring of this natural product, which was recognized as a distorted chair.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270220507
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  • 3
    Electronic Resource
    Electronic Resource
    Acrosome reaction of boar spermatozoa in homologous in vitro fertilization (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 36 (1993), S. 84-88 
    Details
    ISSN: 1040-452X
    Keywords: Capacitation ; Triple stain technique ; Lectin ; Oocyte ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Ejaculated spermatozoa from four different boars were used to evaluate the acrosome reaction during in vitro fertilization with homologous ovulated oocytes. The acrosome reaction was assessed according to a peroxidase-labeling peanut agglutinin method and a triple-stain technique. An increase in the proportion of living sperm with reacted acrosomes was observed after preincubation and 2 hr of coincubation (P 〈 0.05). The percentage of true acrosome-reacted sperm remained reasonably constant throughout coincubation. In vitro penetration rates of oocytes varied among boars, but no relationship was found between fertilization rates of oocytes and maximum percentages of acrosome reacted living sperm. © 1993 Wiley-Liss, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080360112
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  • 4
    Electronic Resource
    Electronic Resource
    Adsorption of tryptophan metabolites from physiological fluids on XAD-2 and determination by single ion monitoringPresented in part at the 10th International Symposium on Advances in Chromatography, Munich, Germany 3-6 November 1975.Abbreviations: T = tryptamine; IAA = indole-3-acetic acid; 5-HT = 5-hydroxytryptamine; 5-HIAA = 5-hydroxyindole-3-acetic acid; 5-HTP = 5-hydroxytryptophan; TP = L-tryptophan; EA = ethyl acetate; ACN = acetonitrile; PFPA = pentafluoropropionic anhydride. (1976)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1976), S. 91-96 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Endogenous tryptamine, 5-hydroxytryptamine, indoleacetic acid, 5-hydroxyindoleacetic and tryptophan have been recovered from urine and cerebro-spinal fluid by adsorption on XAD-2 resin (0.3 g). After adsorption of the sample on the resin, desorption with methanol provides a single fraction that contains all of these metabolites. The mass spectra of their pentafluoropropionyl derivatives show prominent ions at m/e 276 and 438 which are characteristic of indoles and 5-hydroxyindoles, respectively, a feature that allows the concurrent determination of all the components of each group by functional group analysis. A method has been developed to carry out single ion monitoring with the peak matching system of an Hitachi RMU-6H mass spectrometer. Identifications are based on the respective Kovats Indices and single ion monitoring of two characteristic ions per compound: tryptophan (m/e 276 and 347); tryptamine (m/e 276 and 289); indoleacetic acid (m/e 276 and 335); 5-hydroxytryptamine (m/e 438 and 451); 5-hydroxyindoleacetic acid (m/e 438 and 497). The method described illustrates the feasibility of assaying biogenic indoleamines and acidic metabolites, as well as their precursor amino acid on a single fraction in contrast to other standard fractionation methods. This is possible even if the mass spectrometer is not equipped with an alternating voltage accelerator provided that it has a peak matcher, although the lack of an alternating voltage accelerator requires two separate injections of the same sample, for quantification and identification; one for the indole profile and another for the 5-hydroxyindole profile. Both profiles can be verified by individual monitoring of the other confirmatory ions. With this method the use of a multiple ion detector would allow a simultaneous determination of all of these metabolites in one gas chromatograph mass spectrometer run.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200030210
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  • 5
    Electronic Resource
    Electronic Resource
    Organochlorine pesticides by negative ion chemical ionization. Brain metabolites of lindane (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 16 (1988), S. 279-284 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A gas chromatographic/mass spectrometric technique for the analysis of organochlorine compounds using negative ion chemical ionization is presented. Detection limits for some compounds (penta- and hexachlorobenzene and p,p′-DDE) are of the order of 60-120 fg injected, while others (lindane, aldrin, etc.) are in the low picogram range (1.0 pg for lindane). The extreme selectivity for chlorine-containing compounds enables the direct analysis of homogenates of biological samples without any extraction or purification step. Metabolic studies can thus be remarkably simplified. Results are presented on the application of this technique to the analysis of lindane metabolites found in rat brain after treatment with this pesticide.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200160154
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  • 6
    Electronic Resource
    Electronic Resource
    Vibrational analysis for the all-trans ferroelectric phase conformation of P (VDF) homopolymer and of P(VDF/TrFE) copolymer: A cluster-lattice calculation (1991)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 29 (1991), S. 811-817 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Green's functions formalism and transfer matrix method have been used to predict the spectra of all-trans poly(vinylidene fluoride) and the expected changes for poly(vinylidene fluoride/trifluoroethylene) copolymers with the same chain conformation. We find that the use of a simple cluster-lattice calculation, where the impurity cluster is a trifluoroethylene (TrFE) unit immersed in a poly(vinylidene fluoride) [P(VDF)] regular chain, can explain the main features observed by infrared and Raman spectroscopy in the frequency range 800 to 1450 cm-1. The bands associated to vibration modes of regular VDF sequences, like the 880, 1070, 1280, and 1430 cm-1 ones, are predicted to decrease or even to disappear with increasing TrFE content. The appearance of new peaks at 970, 1300, 1330, and 1410 cm-1 is also discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1991.090290705
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