Preparation of Sulfur of High Purity

Preparation of High-Purity Grade Ammonium Sulfate from Locally Available Products

Preparative Separation of Sulfur-Containing Diketopiperazines from Marine Fungus Cladosporium sp. Using High-Speed Counter-Current Chromatography in Stepwise Elution Mode

High-speed counter-current chromatography (HSCCC) was successively applied to the separation of three sulfur-containing diketopiperazines (DKPs) (including two new compounds cladosporin A (1) and cladosporin B (3), and a known compound haematocin (2)) from a marine fungus Cladosporium sp. The two-phase solvent system composed of n-hexane-ethyl acetate-methanol-water at (1:1:1:1, v/v) and (2:1:2...

Asymmetric Synthesis Using Organometallic Reagents and Optically Pure Vinylic Sulfoxides

A new, general method is developed for preparation of various 3-substituted carbonyl compounds of very high optical purity. Application of this method is made to asymmetric synthesis of either enantiomer of 3—methylalkanoic acids, of optically pure 3-methylcyclopentanone, 3—methylcyclohexanone, 3-naphthylcyclopentanone and 3-vinylcyclopentanone j. 9,11-Seco steroid and steroid intermediate are ...

Evaluation of zeta-potential and particle size of technetium 99mTc-sulfur colloid subsequent to the addition of lidocaine and sodium bicarbonate.

UNLABELLED The use of (99m)Tc-sulfur colloid lymphoscintigraphy for the determination of lymph flow patterns from a tumor site and localization of the sentinel node has been widely adopted. However, the effects of multiple injections of the radiopharmaceutical can range from mild discomfort to pain. pH-adjusted lidocaine HCl coadministered with (99m)Tc-sulfur colloid presents a risk of introduc...

Microwave Preparation of Technetium-99m Sulfur Colloid

Technetium-99m sulfur colloid ( mTc-SC) has been useful in reticuloendothelial imaging, and in particular in liver/spleen and more recently bone marrow scintigraphy. Technetium99m SC can also be employed to localize acute gastrointestinal bleeding and has been used in lung ventilation studies. The standard radiolabeling method requires a heating period in a boiling water bath. A comparison of a...

Technetium-99m radiopharmaceutical preparation problems: 12 years of experience.

OBJECTIVE Chemical reactions involved in preparing 99mTc radiopharmaceuticals occasionally result in products of substandard purity. A retrospective examination of preparation problems that occurred in the author's institution was conducted to better define the incidence, recognize patterns and identify causes of substandard 99mTc radiopharmaceutical products. METHODS All 99mTc radiopharmaceu...