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  • 1
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    Detection of anabolica in meat (administration sites) by three-dimensional HPLC/HPTLC (1985)
    Springer
    Details
    Publication Date: 1985-01-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 2
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    Determination of DES and other anabolics in urine and faeces by LC-EC (1982)
    Springer
    Details
    Publication Date: 1982-01-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 3
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    Introduction of the concept “diathesis” of chemical compounds (1973)
    Springer
    Details
    Publication Date: 1973-06-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 4
    Electronic Resource
    Electronic Resource
    A new approach to confirmation by infrared spectrometry (1990)
    New York, NY : Wiley-Blackwell
    Journal of Chemometrics 4 (1990), S. 61-77 
    Details
    ISSN: 0886-9383
    Keywords: Infrared ; Spectroscopy ; Spectrometry ; Retrieval ; Confirmation ; Chemometrics ; Adequate peaks ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the series of analytical techniques for identification of chemical substances, infrared spectrometry presents by far the highest information content. However, the information is most complicated too. It concerns a multitude of band positions, band intensities and band shapes, which, moreover, can be disturbed by matrix and other effects. The high redundancy, however, allows conclusions to be made by a qualitative, subjective procedure.IR is often used to prove the equality between a sample and a reference material, e.g. in quality control of a production process. In forensic control, the question to be answered is mostly not to prove equality, but whether or not the presence of a compound in a sample, e.g. a drug, can be proved. Moreover, testing has to be performed according to objective rules.To fulfil these requirements, a new retrieval algorithm, the ‘Adequate Peaks Search’, is presented. It concerns representing the reference spectra by sets of adequate peak positions and the sample spectrum by a set of all peak positions, whereafter the cross-sections of the sample set and the reference sets are determined. The concept ‘adequate peak’ is defined and criteria have been formulated to evaluate the results into a positive (presence of the analyte is proved) or negative (presence is not proved) conclusion.The detection limit when the Adequate Peaks Search (APS) method was applied was four to seven times lower than that attained by a number of experts.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cem.1180040108
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of DES and other anabolics in urine and faeces by LC-EC (1982)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 311 (1982), S. 405-406 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00481772
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  • 6
    Electronic Resource
    Electronic Resource
    Detection of anabolica in meat (administration sites) by three-dimensional HPLC/HPTLC (1985)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 320 (1985), S. 749-752 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Anabolics in administration sites of animals for meat production were analyzed by a two-stage method. It consists of a screening method, based upon HPLC with UV detection, and of a confirmation method by three-dimensional HPLC/HPTLC on the positive results obtained by the HPLC method. After appropriate extractive pretreatment the sample was dissolved in methanol/water and an aliquot was injected upon a Hypersil-ODS column with UV detection at 254 and 280 nm. HPTLC was performed by two-dimensional chromatography on silica gel plates. Relevant data such as HPLC and HPTLC conditions, retention times, Rf-values and observed fluorescent colours are reported, together with a practical classification of the anabolics to achieve optimal results. The following compounds were investigated: estriol,α- andβ-trenbolone, zeranol, nortestosterone, testosterone, 17β-estradiol, diethylstilbestrol, dienestrol, hexestrol, methyltestosterone, medroxyprogesterone and medroxyprogesterone acetate. The method was successfully tested on spiked samples as well as on real samples of administration sites.
    Notes: Zusammenfassung Das Zweistufen-Verfahren besteht aus einer Screening-Methode (HPLC mit UV-Detektion) und einer Bestätigung durch HPLC/HPTLC. Nach einer extraktiven Vorbehandlung der Probe wird eine Lösung in Methanol/Wasser auf eine Hypersil-ODS-Säule injiziert; die Detektion erfolgt im UV bei 254 und 280 nm. Die HPTLC wird zweidimensional auf Silicagel-Platten durchgeführt. Die erforderlichen Daten (experimentelle Bedingungen, Retentionszeiten, Rf-Werte, Fluorescenzfarben) sowie eine geeignete Klassifizierung werden mitgeteilt. Die folgenden Verbindungen wurden in die Untersuchung einbezogen: Östriol,α- undβ-Trenbolon, Zeranol, Nortestosteron, Testosteron, 17β-Östradiol, Diethylstilböstrol, Dienöstrol, Hexöstrol, Methyltestosteron, Medroxyprogesteron und Medroxyprogesteronacetat. Das Verfahren wurde mit gutem Erfolg an Zusatzproben sowie an praktischen Proben aus dem Bereich der Applikationsstellen angewendet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556049
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  • 7
    Electronic Resource
    Electronic Resource
    Introduction of the concept “diathesis” of chemical compounds (1973)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 264 (1973), S. 204-211 
    Details
    ISSN: 1618-2650
    Keywords: Spektralphotometrie, I.R. ; Spektrometrie, Raman ; Einführung des Begriffs Diathese
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary “Diathesis” is a new concept, introduced to describe the behaviour of chemical compounds as apparent from infrared and Raman spectra. It is defined as a part of a molecule or a whole molecule acting as a separate vibration unit, or more exactly: a diathesis is a part of or an entire molecular configuration, which shows normal modes with only a few percent of the energy outside that (part of the) configuration. With the help of this concept can be explained: the large differences in various spectra of the very same compound; the remarkable similarity in spectra of different compounds. The use of the new concept is illustrated by a number of examples. It is demonstrated that in large molecules a diathesis can be considered as a “characteristic group”.
    Notes: Zusammenfassung Der Begriff „Diathese“ wurde eingeführt, um das Verhalten chemischer Verbindungen in bezug auf IR- und Raman-Spektren zu beschreiben. „Diathese“ wird definiert als Teil eines Moleküls oder ein ganzes Molekül, das als eigene Schwingungseinheit auftritt, oder genauer: eine „Diathese“ ist eine gesamte molekulare Konfiguration oder ein Teil davon, das normales Energieverhalten zeigt mit nur wenigen Prozenten der Energie außerhalb dieses Teiles (oder der Gesamtkonfiguration). Mit Hilfe dieses Begriffes lassen sich einerseits große Unterschiede in verschiedenen Spektren derselben Verbindung, wie auch andererseits bemerkenswerte Ähnlichkeiten bei Spektren verschiedener Verbindungen erklären. Einige Beispiele werden gegeben. In großen Molekülen kann eine „Diathese“ als eine „charakteristische Gruppe“ angesehen werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00584400
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