Functionalization of epoxy esters with alcohols as stoichiometric reagents
作者:Dona Pavlović、Barbara Modec、Darko Dolenc
DOI:10.17344/acsi.2014.1306
日期:2015.6.15
Glycidyl esters, frequently employed as reactive groups on polymeric supports, were functionalized with alcohols as stoichiometric reagents, yielding β-alkoxyalcohols. Among the solvents studied, best results were obtained in ethers in the presence of a strong proton acid as a catalyst. Alcohols include simple alkanols, diols, protected polyols, 3-butyn-1-ol 3-hydroxypropanenitrile and cholesterol
HPLC Analysis of Indomethacin and Its Impurities in Capsule and Suppository Formulations
作者:E. Kwong、G.K. Pillai、K.M. mcerlane
DOI:10.1002/jps.2600710730
日期:1982.7
Indomethacin and itsimpurities in suppository and capsuleformulations were quantitatively determined by HPLC using a reversed-phase, octadecyl column and a mobile phase of methanol-water-acetonitrile-acetic acid (55:35:10:1). Analysis of the suppositoryformulations provided a mean potency for indomethacin of 103.8%. The same formulation was found to contain 4-chlorobenzoic acid (0.02%), 5-metho
One lot of indomethacin raw material, five lots of capsule preparations, and three lots of supporitory formulations were screened for impurities by TLC. Only the suppository products exhibited impurities above trace levels. The two main impurities were present at levels estimated at approximately 0.5 and 2%. After isolation from preparative TLC plates, they were identified by NMR, IR, and mass spectroscopy