Synthesis of Phthalthrin-14C (Neo-Pynamin®-14C)

Synthesis of 14C-labeled alkyl polyoxyethylene detergents.

Procedures for the synthesis and purification of two 14C-labeled alkyl polyoxyethylene detergent preparations are described. One of the preparations consisted mainly of [14C]dodecyloctaoxyethylene ether, the other consisted mainly of [14C] octylhexaoxyethylene ether, with critical micellar concentrations of approximately 50 microM and 10 mM, respectively. Condensation of alkyl bromides with fra...

A facile synthesis of [14C] epicholesterol.

A facile procedure is described for the preparation of [14C]epicholesterol from [14C]cholesterol. Cholesterol is first converted to cholesteryl mesylate, which is treated with cesium acetate and 18-crown-6 in refluxing toluene to give epicholesteryl acetate. The latter is hydrolyzed, without isolation, with potassium hydroxide in tetrahydrofuran-methanol to give epicholesterol, which is obtaine...

Stimulation of(14C)serotonin synthesis from (14C)tryptophan by mescaline in rat pineal organ cultures.

substrate. Mescaline does not inhibit the deandnation of [14C] serotonin to 5-hydroxyindoleacetic acid and has no significant effect on the intracellular content of [14C] tryptophan or its conversion to [14G] protein. It is • 14 concluded that mescaline stimulates p_ne;¢l [ C] serotonin synthesis via a primary stimula£ory action on the enzymatic conversion of [14.C]tryptophan to 5-hydroxytrypto...

Portal absorption of 14C after ingestion of spiked milk with 14C-phenanthrene, 14C-benzo[a]pyrene or 14C-TCDD in growing pigs.

Polycyclic aromatic hydrocarbons (PAHs) and dioxins are lipophilic organic pollutants occurring widely in the terrestrial environment. In order to study the PAHs and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) transfer in the food chain, pigs have been fed with milk mixed either with 14C-phenanthrene, with 14C-benzo[a]pyrene or with 14C-TCDD. The analysis of portal and arterial blood radioactivi...

Synthesis of 2-(4-methoxyphenyl)ethanol[ring-1-14C].