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  • 1
    Electronic Resource
    Electronic Resource
    Zur Identifizierung und quantitativen Bestimmung von Ureiden, Methaqualon und Barbituraten aus Organteilen durch NMR-Spektroskopie (1971)
    Springer
    Archives of toxicology 27 (1971), S. 168-172 
    Details
    ISSN: 1432-0738
    Keywords: NMR-Spectroscopy ; Ureides, Methaqualone, Barbiturates ; Identification ; Quantitative Determination ; NMR-Spektroskopie ; Ureide, Methaqualon, Barbiturate ; Identifizierung ; Quantitative Bestimmung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Durch NMR-Spektroskopie wurden Carbromal, Bromisoval, Methaqualon und Barbital aus Organmaterial identifiziert und quantitativ bestimmt.
    Notes: Abstract Carbromal, Bromisoval, Methaqualone and Barbital from autopsy material were identified and quantitatively determined by means of NMR-spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343156
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  • 2
    Electronic Resource
    Electronic Resource
    Computer-aided multichannel detection in high-performance liquid chromatography (1982)
    Springer
    Chromatographia 16 (1982), S. 69-78 
    Details
    ISSN: 1612-1112
    Keywords: High-performance liquid chromatography ; Rapid-scanning multichannel detection ; Higher derivative spectroscopy ; Diacetylmorphine ; Forensic analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The development of a computer-aided rapid-scanning detector for HPLC based on the linear photodiode array UV-visible spectrophotometer is described. Chomatograms monitored at up to three wavelengths, with automatic capture of spectra for eluted peaks and post-run processing of spectral data to generate log10 (A) spectra, second derivative and fourth derivative spectra, are described. Methods are reported for the analysis of forensic samples of diacetylmorphine (heroin) in the presence of the degradation products and potential contaminants caffeine, papaverine, 6-acetylcodeine, thebaine, 6-acetyl-morphine, procaine and morphine separated by HPLC. The novel use of second and higher derivative spectra for the qualitative characterisation of drugs and contaminants separated by HPLC is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02258872
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  • 3
    Electronic Resource
    Electronic Resource
    An evaluation of the structural requirements for the separation of propranolol enantiomers on Pirkle phases following achiral derivatisation (1990)
    Springer
    Chromatographia 30 (1990), S. 73-79 
    Details
    ISSN: 1612-1112
    Keywords: Pirkle phases ; Isocyanate ; isothiocyanate ; Urea ; thionrea ; Chiral recognition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The chromatographic performance of a series of isocyanate and isothiocyanate derivatives of (±)-propranolol has been investigated on three Pirkle-type chiral stationary phases (CSP's), 3,5-dinitrobenzoylphenylglycine (PHE), 3,5-dinitrobenzoylleucine (LEU) and phenethylpropylurea (PEPU). The reaction yield is independent of the substituent group but is affected by choice of solvent. The urea or thiourea derivative group formed is responsible for any separation observed on the amino acid based phases, the retention being related to structure. The structure-retention relationship is not apparent for the π-basic PEPU phase, moreover resolution is not simply related to retention for all three phases. Inversion of elution order of the enantiomers is observed with certain derivatives on the LEU column. The naphthyl and nitrophenyl derivatives generally exhibit enhanced retention, with the naphthylurea derivative generally giving the best resolution on these phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02270452
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  • 4
    Electronic Resource
    Electronic Resource
    Reversal of elution order of urea and thiourea derivatives of propranolol enantiomers on ionically versus covalently bound pirkle phases (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 2 (1990), S. 120-123 
    Details
    ISSN: 0899-0042
    Keywords: Pirkle phases ; propranolol enantiomers ; urea derivatives ; thiourea derivatives ; chiral separation ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chromatographic performance of a series of urea and thiourea derivatives of (±)-propranolol has been evaluated on three different Pirkle stationary phases. Seven different isocyanate reagents were used to generate a range of both aliphatic and aromatic urea derivatives with the isothiocyanates yielding the corresponding thiourea analogues. The Pirkle phases employed consisted of 3,5-dinitrobenzoylphenylglycine and 3,5-dinitrobenzoylleucine, both ionically and covalently bound to aminopropyl silica as well as phenethylpropylurea (covalently attached only). The urea derivatives were consistently more strongly retained on covalently bound columns than their thiourea counterparts. This is in contrast to the situation observed for the ionic columns, where the thiourea derivatives were the more strongly retained on the phenylglycine column and the more strongly retained in four of seven instances on the leucine column. The underlying mechanisms giving rise to these differences in retention are as yet unidentified but appear to involve the urea group.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530020209
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