Liquid chromatography with charged aerosol detection (LC-CAD)
Liquid chromatography with charged aerosol detection (LC-CAD) analysis is a powerful technique used for polysorbate quantification and profiling.
After a separation step via high-performance liquid chromatography (HPLC), the column eluent is nebulized by a nitrogen flow, the mobile phase is evaporated together with other volatile components. In the case of CAD, the analyte particles are subsequently positively charged by a secondary nitrogen stream. The final detection of these dried particles, all nonvolatile, takes place by means of light scattering (photomultiplier) or level of electrical charge (electrometer) for CAD, respectively.
LC-CAD in combination with a product-specific sample preparation protocol to remove protein, is Coriolis’ workhorse for polysorbate quantification. Depending on the LC-protocol the main subclasses of polysorbate are resolved and degradation kinetics can be followed in a straightforward way.
For a more in-depth analysis of polysorbate degradation, Coriolis is performing liquid chromatography coupled mass spectrometry [LC-MS] analysis.
Besides surfactant characterization, CAD analysis finds application for excipient quantification in general.
Quality & biosafety level of this method
We provide all our analytical services with the highest quality standards. Each project is carried out by experienced scientists and every report or data presentation is comprehensively checked by a scientific reviewer. We offer this technology with the following quality and biosafety level:
Standardized methods or dedicated method development
For common sample types, we can often apply standardized methods with little setup effort. On top of this, our experienced analytical scientists perform in-depth method development or method optimization tailored to your drug substance, product type and development phase. Under GMP, we also offer full method validation or compendial method verification.
During method development, we tailor sample preparation, method settings, and data analysis to the needs of your project and sample.
For this purpose, we include a representative sample and, where available, suitable reference standards and stressed/degraded materials. This way, our analytical scientists can design a method that is highly suitable for your needs, stability indicating, as well as robust and repeatable. Upon request, we compile a detailed method description for your records.
A method qualification is the initial assessment of the performance of an analytical procedure to show that it is suitable for the intended purpose.
During method qualification, our analytical scientists perform a documented testing that demonstrates that the analytical procedure meets certain acceptance criteria in several categories. These may include repeatability, linearity, intermediate precision, robustness and more. We compile a qualification plan and a qualification report including all relevant data.
A method validation is the confirmation under highly controlled conditions that the performance of an analytical procedure is suitable for the intended purpose.
During method validation, our analytical scientists perform a documented testing, which demonstrates that the analytical procedure consistently produces a result that meets the pre-determined acceptance criteria. We compile a validation plan and a validation report including all relevant data.
Do you have any questions? Want to analyze your samples?