Lipophilic neutral carriers were synthesized which show Li+/Na+ selectivities of up to ca. 80 in highly lipophilic liquid membranes. The sensor membranes exhibit improved response times and increased lifetimes as compared to systems described earlier. They allow reliable measurements of Li+ in blood serum within the clinical concentration range. A 1 :I Li+/ionophore complex of one representative (N,N,N,N'-tetracyclohexyl-5,5-dimethyl-3,7-dioxaazelaamide) has been prepared, and its structure was elucidated by X-ray analysis.Introduction. -Among the different neutral carrier-based membranes recommended for Li+-selective electrodes [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], only few show acceptable Li+/Na+ selectivities for the potentiometric assay of Li' in blood serum during therapy of manic depressive psychosis
Du deutério‐cholestérol libre ou estérifi é est administré à des rats, des chiens et des hommes. On détermine la concentration du cholestérol marqué libre et estérifié dans le contenu intestinal, l'intestin, les selles, le sang et différents organes du Chien, dans l'intestin du Rat, dans les selles et le sang de l'Homme. Les valeurs obtenues permettent d'établir le coefficient de digestibilité vrai chez le Chien et l'Homme, et le rǒle‐des cholestérolestérases intestinales chez le Chien et le Rat. Les résultats sont discutés.
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