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The BioPharmaSpec Approach”: Mass Spectrometry Based Host Cell Protein Identification and Quantitation

1. Introduction

As part of the development of any biopharmaceutical product, the impurities present must be examined, minimized and where possible characterized (1). These impurities fall into two broad categories: product-related impurities (derived specifically from the drug product itself) and process-related impurities (derived from material associated with the production, processing or purification of the sample). Host cell proteins (HCPs) are process-related impurities that require specific analysis due to the multitude of naturally occurring proteins expressed in the production cell line.
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