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  • Impurities in Drug Substance & in Drug Product

    Dec 12, 2013· Identified Impurity: An impurity for which a structural characterisation has been achieved. Unidentified Impurity: An impurity for which a structural characterisation has not been achieved and that is defined solely by qualitative analytical properties (e.g.,

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    high-performance concrete and why they are selected. Table 17-2 lists properties that can be selected for high-performance con-crete. Not all properties can be achieved at the same time. High-performance concrete specifications ideally should be perform-ance oriented. Unfortunately, many speci-fications are a combination of performance

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    A fast strategy for profiling and identifying pharmaceutic excipient polysorbates by ultra-high performance liquid chromatography coupled with high-resolution mass spectrometry Zhe Wang, Yanan Wang, Cai Tie, Jinlan Zhang


    Makino Y, Urano Y and Nagano T: Impurity profiling of Ephedrines in Methamphetamine by High-performance liquid chromatography. Journal of Chromatography A 2002; 947: 151-54. Choe S, Heo S, Choi H, Kim E, Chung H and Lee J: Analysis of pharmaceutical impurities in the Methamphetamine crystals seized for drug trafficking in Korea.