Use of analytical methods in pharmaceutical industry enables monitoring of different parameters that indicate successful and suitable production process. When using a method in a laboratory, prescribed analytical procedures need to be followed. It is very important that the methods are validated before using them for routine use, e.g. release testing. Validation has to be performed in order to prove the suitability of the method for its intended purpose and the capability of producing reliable and reproducible results which confirm safety, effectiveness and quality of the produced medicines. For this purpose, the regulatory authorities issued several guidelines describing the parameters, to be evaluated during validation. The International conference on harmonization guidelines provide a coordinated approach by regulatory authorities from Europe, Japan and the United States of America. In this master's thesis method validation for biological activity measurement of a model antibody biologics is discussed. It had been determined that the most important mode of action, and consequently the release method for measuring biological activity of this specific antibody was antibody dependent cell mediated cytotoxicity. Using this method, we measure the quantity of released dye from target cells after effector cells kill them with the help of monoclonal antibodies. According to the guidelines, the following validation parameters were defined based on the intended purpose of the method: specificity, linearity, range, accuracy, precision (repeatability, intermediate precision), robustness and stability indicating properties. Based on the results it can be concluded, that the selected method is specific, as no matrix interferences were detected; linear (accurate and precise) within the 50–200 % range of the relative biological activity, and robust. In all tests the accuracy of the results was within 8 % of the expected value with variability of 8 % or less. The method met all the requirements during the validation and is therefore suitable for its intended use. In the future the method will be used routinely for determining biological activity of a model antibody biologics.
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