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  • 1985-1989  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Inflammation research 16 (1985), S. 84-86 
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of cosmetic science 7 (1985), S. 0 
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: To assess ocular irritancy caused by chemical and cosmetic products a reliable method based on evaluation of histamine (Hm) in tears is presented. Hm is measured at picomole levels by HPLC and fluorimetric detection after fluorescamine-HM derivatization. In order to avoid any uncontrolled irritation and stimulation of the conjunctiva during sample collection, a procedure of conjunctiva lavage was developed. A balanced salt solution (50 μl) containing a known amount of Hm-fluorophore as reference standard is instilled in the conjunctiva fornix. After a few seconds 20 μl of tear fluid is collected: 10 μl are immediately analysed and 10 μl after derivatization reaction. In this way it is possible to evaluate tear dilution and to assess Hm content in less than 10 minutes.In a group of 20 normal subjects Hm has been determined in comparison with that of two volunteers after topical application of 50 μ of 0.2% and 0.4% sodium lauryl sulphate solution. A contact of 30 seconds of the cosmetic ingredient caused an immediate dose-dependent Hm release through a direct cytotoxic damage of cell membranes due to the surfactant action.Évaluation de l'irritation occulaire due aux cosmétiques par la détermination de l'histamine lacrimale
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of cosmetic science 10 (1988), S. 0 
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The results of a chemical/microbiological comparative study on different preservative mixtures are reported. The aim of the investigation was to ascertain whether there was a correlation between chemical stability and microbiological activity.The studies were carried out directly in cosmetic emulsions preserved with different mixtures of Prevan, Bronopol, Germall 115 and Kathon CG.The degree of microbiological activity was tested with respect to E. coli, Ps. aeruginosa, Asp. niger, S. aureus using the agar diffusion test, over a period of 400 days.The chemical behaviour of the different mixtures was evaluated by HPLC in reverse phase mode. The emulsion samples were directly injected after dilution with a THF/H2O) (9/1) solvent mixture.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of cosmetic science 10 (1988), S. 0 
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Dehydroacetic acid sodium salt Prevan (DHANa) stability in presence of other cosmetic preservatives as Bronopol, Germall 115 and Kathon CG was investigated through a HPLC method that permits simultaneous determination of binary and ternary mixtures of the above preservatives.A new molecule coresponding to 3,7–dimethyl-1H, 9H, 10H, dipyrano (4,3-b: 3',4'-e) pyran-1, 9-dione has been discovered to be spontaneously formed between DHA and free or released formaldehyde. Its structure has been established by means of elemental analysis, NMR and mass spectrometry aswell as its chromatographic and antimicrobial behaviour.The magnesium salt present as stabilizer in the Kathon CG solution can also cause the formation of insoluble magnesium salt from DHANa.The ascertained chemical interaction among these preservatives is therefore discussed as a function of their cosmetic application.〈section xml:id="abs1-2"〉〈title type="main"〉Résumé: La stabilité de l'acide dehydroacééique de sel de sodium Prevan—(DHANa) a étéétudiée par la méthode HPLC en prééence d'autres conservateurs cosmétiques tels que le Bronopol, Germall 115 et Kathon CG, ce qui a permis une détermination simultanée des mélanges binaires et ternaires des conservateuis ci-dessus. Quelques interactions importantes ont été découvertes.Une nouvelle molécule correspondant à 3,7-dimethyl-1H, 9H, 10H, dipyrano (4,3-b: 3',4'-e)pyran-1, 9-dione a été découverte. Cette molécule se forme spontanément entre le DHA et le formaldehyde libre ou produit. Sa structure a étéétablie par des moyens d'analyse élementaires, NMR et spectrometrie de masse ainsi que grâce a son comportement chromatographique et antimicrobien.Le sel de magnésium présent en tant que stabilisateur dans les solutions de Kathon CG peut également inactiver DHANa par la formation d'un sel de magnésium insoluble.Par conséquent, la constatation des interactions chimiques parmi ces conservateurs est discutée comme étant une fonction de leur application cosmétique.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The qualitative and quantitative determination of the Na salt of dehydroacetic acid, Prevan®, a widely employed antimould agent in cosmetic emulsions, has been obtained by the direct analysis of the emulsion itself by fast atom bombardment and collisional spectroscopy.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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