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  • Articles: DFG German National Licenses  (2)
  • Chemistry  (1)
  • Drug solubility  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 281 (1989), S. 193-197 
    ISSN: 1432-069X
    Keywords: Drug solubility ; Ointment vehicle ; Drug efficacy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a bilateral paired comparison (randomized double-blind study) 31 dermatitis patients (atopic and contact dermatitis) were tested with two ointments containing 0.0056% betamethasone-17-benzoate. One ointment was applied on each side of the body. The topical formulations differed in their solution capacities for the drug by a factor of about 50 (solution-type: high mutual affinity between drug and vehicle; suspensiontype: low affinity). The different antiinflammatory effects were studied visually by assessing five symptoms: erythema, scaling, infiltration, lichenification, and excoriation. On the 5th day, 73% of the patients showed significant differences between the sides in favor of the suspension-type ointment (Wilcoxon test). Blanching tests on 30 volunteers confirmed the result. The in vitro drug release, however, was faster with the solution-type ointment. The efficacy of an ointment can be increased greatly, if the solution capacity for the drugs is low, and thus the partition coefficient between the stratum corneum (barrier of the skin) and the vehicle is high. As long as the barrier is not damaged completely, the difference in drug release is not the determining factor for the effect.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 26 (1901), S. 322-344 
    ISSN: 0863-1778
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung1. In Übereinstimmung mit den Angaben MC CAY's ergeben unsere Versuche, dass sich beim Lösen von Arsenpentasulfid in Natronlauge, Kalilauge, Ammoniak und Baryumhydroxyd nicht, wie BERZELIUS angab, Sulfarsenat und Arsenat, sondern Sulfarsenat und Sulfoxyarsenate bilden. Von Sulfoxyarsenaten sind Monosulfoxyarsenat und Disulfoxyarsenat nachgewiesen, und zwar in allen Fällen. Aber während nach unseren Versuchen das Disulfoxyarsenat vorwiegt, findet MCCAY das Monosulfoxyarsenat in Überschuss. Dabei unterscheidet sich unsere Arbeitsmethode von derjenigen MC CAY'S in Beziehung auf das Einwirkenlassen der verschiedenen Hydroxyde auf das Sulfid nur wenig  -  MC CAY wendet die Hydroxyde im Überschuss an und kocht beim Baryumhydroxyd, während wir etwa die berechnete Menge nehmen und auch das Baryumhydroxyd nur bei gewöhnlicher Temperatur einwirken lassen  - ; die beiderseitige Untersuchungsart der entstandenen Salze ist aber in jedem Fall eine ganz verschiedene.
    Type of Medium: Electronic Resource
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