Coproporphyrin and uroporphyrin are separated from urineand from each other by absorption onto, and Selective elution from, an anion-exchange resin. The two compounds are #{233}eparated by using solvents differing in both polarity and pH. The porphyrins are then quantitated with an Aminco-Bowman Spectrophotofluorometer equipped with an ellipsoidal mirror and a red-sensitive photomultiplier tube...

DESCRIPTION COLESTID Granules and FLAVORED COLESTID Granules contain colestipol hydrochloride, which is a lipid lowering agent for oral use. Colestipol hydrochloride is an insoluble, high molecular weight basic anion-exchange copolymer of diethylenetriamine and 1-chloro-2, 3-epoxypropane, with approximately 1 out of 5 amine nitrogens protonated (chloride form). It is a light yellow water-insolu...

This communication describes a method for adsorbing the invertase (EC.3.2.1.26) on DOWEX® anion exchange resin. Among the types of DOWEX® resins studied (1x8:50-400; 1x4:50-400 and 1x2:100400), 1X4-200 was the most suitable, because it adsorbed the invertase molecules completely and the complex 1X4-200/invertase retained 100% of the catalytic activity. Moreover, no leakage of enzyme from the su...