Zobrazeno 1 - 10 of 18 pro vyhledávání: '"K. J. Keuning"'
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Determination and adjustment of the activity of adsorbents for chromatography and of the eluting power of elution solvents by means of the 'shake test': (Analysis of fat soluble vitamins III))
Autor: K. J. Keuning, G. J. van Dijk, M. J. Wiggers de Vries
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 76:747-756
Adjustment of the activity of adsorbents for chromatographic use (e.g. Al2O3 or CaHPO4 by the controlled take-up of water) can be done in a reproducible and accurate manner with the aid of the “shake-test”. It consists in shaking a weighed sample
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ce5f0a151e8378068a6c39b7d6d8fc65
https://doi.org/10.1002/recl.19570760910
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7
A chemical routine determination of vitamin-D; correlation with the biological determination. (Analysis of fat soluble vitamins II))
Autor: F. J. Mulder, Th. J. de Man, J. R. Roborgh, K. J. Keuning, K. H. Hanewald
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 76:733-746
A chemical routine method for the determination of vitamins-D2 and -D3 in a number of preparations is presented. The results obtained agree very well with those obtained with the rat and chick assays respectively. A procedure for the routine determin
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7e3e621d1ef2994c50ef2f3c2ae1323b
https://doi.org/10.1002/recl.19570760909
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8
Spectrophotometric assay of α-tocopherol
Autor: F. J. Mulder, K. J. Keuning
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 80:1029-1039
The benzene washing procedure for the isolation of unsaponifiable residues has been applied to vitamin E preparations containing α-tocopheryl esters only. The isolation procedure is carried out once (after saponification) or twice (before and after
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7ac89b13cb84933c56f20a7b98672395
https://doi.org/10.1002/recl.19610800912
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9
Evaluation of the Effect of Isomerization on the Chemical and Biological Assay of Vitamin D
Autor: K. J. Keuning, J.R. Roborgh, J. A. Keverling Buisman, K. H. Hanewald, F.J. Mulder
Publikováno v: Journal of Pharmaceutical Sciences. 57:1326-1329
The reversible thermal isomerization of calciferols (D) to precalciferols(P), leading to a temperature-dependent equilibrium in solutions, interferes with many chemical and biological analytical procedures for the evaluation of vitamin D products. Tw
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c9a4e37670844cff96fb8c518f04388e
https://doi.org/10.1002/jps.2600570810
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10
Reaktionen und Salzbildungen des Alloxans und Alloxantins. XII. Mitt. Systematischer Ausbau der Atomgruppen in der analytischen Chemie
Autor: K. J. Keuning, V. Šindelář, J. V. Dubský
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 59:492-495
Das Studium der Reaktionen und der Salzbildung des Alloxans und Alloxantins beweist klar, dass die blaue Farbung der Ferrosalze mit Alloxan (resp. Ferrisalze mit Alloxantin) unrichtig gedeutet wurde (Liebig, Wohler, Mulder, Deniges). Nur die Ferrosal
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::da0117b07413211358a6cc0d4519a296
https://doi.org/10.1002/recl.19400590512
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Plný text Recenzováno Digitální knihovna AV ČR
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