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  • Title: Development of a purity control strategy for pemetrexed disodium and validation of associated analytical methodology.
    Author: Warner A, Piraner I, Weimer H, White K.
    Journal: J Pharm Biomed Anal; 2015 Feb; 105():46-54. PubMed ID: 25527981.
    Abstract:
    Stability-indicating reversed phase HPLC methods have been developed and validated for the determination of 13 potential process and degradation impurities in pemetrexed disodium drug substance (DS) and pemetrexed for injection drug product (DP). This paper describes the development of HPLC-UV impurity methods for drug substance and drug product. Relative response factors (RRF) have been determined using HPLC-UV in tandem with CAD or by NMR detection. Conditions for the generation of system suitability solutions are described and assure adequate chromatographic resolution and peak identification without the need for impurity reference standards. The methods were fully validated and demonstrated to have acceptable specificity, linearity, accuracy, repeatability, intermediate precision, detection/quantitation limit, and robustness.
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