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A S Ridolfo

Publications and source records attributed to A S Ridolfo.

30 records · Page 2Linked to original sources
PubMedDate not supplied

Metabolism of propionyl erythromycin lauryl sulfate. II. Fate of the lauryl sulfate moiety in the rat and man.

The absorption, excretion, and metabolism of [1-14C]lauryl sulfate as either the sodium or propionyl erythromycin salt has been studied in the rat and man. In the rat 88% of the radiolabel from propionyl erythromycin [1-14C]lauryl sulfate was excreted in the urine in the 24-hr period following a single oral dose. More than 95% of the radiolabel was excreted as the metabolite butyric acid 4-sulfate. This metabolite was shown to be derived from carbons 1-4 of the lauryl sulfate moiety. There was no evidence of sulfate cleavage in the rat. In man 51-59% of the administered ratioactivity was recovered in the urine. The major excretion product was butyric acid 4-sulfate accounting for approximately 95% of urinary radioactivity. The remainder was unchanged lauryl sulfate. A significant portion of the radiolabeled propionyl erythromycin lauryl sulfate was converted to 14CO2 indicating that the sulfate linkage was cleaved. A minimum value of 9-16% of the dose was metabolized in this manner.

Animals↗
PubMedDate not supplied

Stereoselective inversion of (R)-(-)-benoxaprofen to the (S)-(+)-enantiomer in humans.

The enantiomeric composition of benoxaprofen [(RS)-2-(P-chlorophenyl)-alpha-methyl-5-benzoxazoleacetic acid] in plasma and urine was determined after oral administration of both the racemic mixture and the (R)-(-)-enantiomer to normal human volunteers. Resolution of the diastereomeric amides, formed by the reaction of the enantiomers with (S)-(-)-apha-methylbenzylamine, was accomplished by gas chromatography. The (R)-(-1)-enantiomer of the parent drug was stereoselectively inverted to its (S)-(+) isomer in humans.

Adult↗