Pharmacopoeial Requirements - How to Change a Regulated Method

31 Mar 2014

Over the last two centuries massive progress has been made around the globe to make drugs safe for consumers, both on a national as well as on an international level, thus assuring the potency of commercially available drug products. Depending where (in which country or region) a finalized drug product will be used it must meet the specified regulations and thus many pharmaceutical companies work from several pharmacopoeias. One of the more important improvements is the requirement for impurity profiling or in other words the analysis of related substances (RS) monographs. Assay and potency methods as well as identification of impurities are carried out with various analytical techniques. HPLC has especially been widely exploited for impurity profiling methods.

Purospher® STAR HPLC and UHPLC columns

Merck KGaA, Darmstadt, Germany

The base silica of Purospher® STAR columns is 99.999 % pure. Furthermore, meticulous care is given to quality control over all aspects of silica structure and chemistry. The excellent converge of the surface and the purity of the material ensures excellent peak symmetry for acidic, basic and even for chelating compounds. Accurate results with excellent peak shape for all types of analytes Outstanding resolution due to high separation efficiency Proven reliability and reproducibility from run to run and batch to batch Universal compatibility with best all-round performance according to Tanaka Maximum flexibility in method development and choice of mobile phase pH stability from pH 1.5 – 10.5 Suitable for up to 100 % aqueous mobile phases Highest sensitivity and suitability for LC-MS applications

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Chromolith® High Resolution HPLC Columns

Merck KGaA, Darmstadt, Germany

Chromolith® HighResolution: High resolution separations without ultra high pressure. The revolutionary monolithic Chromolith® HighResolution columns are made from a single rod of high-purity monolithic silica, rather than from particles. Their unique bimodal pore structure allows the chromatographic performance to be improved significantly. Speed of analysis (separations up to 9 times faster if required) Separations two times faster at half the column back-pressure compared to μm columns Higher sample throughput Improved HPLC system security Significantly increased column lifetime Reduced maintenance on HPLC pump and injector seals Reduced need for sample preparation as columns are very resistant to blocking (even with biological samples) Column length no longer pressure limited Very high separation efficiency by column coupling

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Pharmacopoeial Requirements - How to Change a Regulated Method