The methods of quantification of HCQ sulfate, despite the undeniable advantages, have certain limitations, such as high cost of operation and maintenance of equipment, sample processing and analysis of the results relatively complicated. However, the simplicity of the process and velocity of the spectrophotometry by absorption in the UV -Vis region corroborate the usefulness of this methodology. Antimalarial drugs chloroquine Hydroxychloroquine cause low wbc Chloroquine dose in vivax malaria Identification and characterization of process related impurities in chloroquine and hydroxychloroquine by LC/IT/MS, LC/TOF/MS and NMR Journal of Pharmaceutical and Biomedical Analysis 2009 A process for preparing hydroxychloroquine, comprising reacting 4,7-dichloroquinoline with N'-ethyl-N'-β-hydroxyethyl-1,4-pentadiamine under high pressure to obtain hydroxychloroquine of the formula The process according to claim 1, wherein the reaction is carried out in the absence of catalyst and solvent. A new LC/MS method was developed for the identification and characterization of process related impurities in chloroquine and hydroxychloroquine bulk drugs. Accurate masses of the impurities were determined by LC–ESI–TOF measurements. The fragmentation patterns were studied by LC/MS n. The structures of the impurities were proposed on the. The method was developed from the sample preparation used in the determination of HCQ in dosage form according to the methodology described by the USP 36. This work describes the application of Qb D in the development, optimization, and validation of an analytical method by absorption spectrophotometry in the UV-Vis region for quantification of HCQ sulfate. Process related impurities in chloroquine and hydroxychloroquine A comprehensive stability-indicating HPLC method for determination of., WO2010027150A2 - New preparation of hydroxychloroquine. What is in hydroxychloroquinePlaquenil for sarcoidosis Chloroquine phosphate and hydroxychloroquine sulfate are substituted 4-amino quinoline compounds that differ only by a hydroxy group. Quinacrine hydrochloride also has the 4-amino quinoline radical but has, in addition, a benzene ring; it is classified as an acridine compound. The 4-amino quinoline. Antimalarial Agents Chloroquine, Hydroxychloroquine, and.. Identification and characterization of process related.. International Journal Of -. The analysis revealed the presence of two impurities in each of the drugs. The impurities are designated as CQ-I, CQ-II for chloroquine; HCQ-I and HCQ-II for hydroxychloroquine. Three of the impurities, CQ-II, HCQ-I and HCQ-II were unknown have not been reported previously. Hydroxychloroquine Plaquenil® is a 4-amino-quinoline antimalarial medication that is widely used to treat systemic lupus erythematosus SLE, rheumatoid arthritis, and related inflammatory and dermatological conditions. It is a hydroxylated version of chloroquine, with a similar mechanism of action. However, following an identical dose of. The focus of this study is identification and characterization of major unknown impurities in chloroquine CQ and hydroxychloroquine HCQ bulk drug samples using liquid chromatography/ion trap mass spectrometry LC/IT/MS and liquid chromatography/time of flight mass spectrometry LC/TOF/MS.