Kelli Jonakin

An increasing number of drugs coming onto the market are proteins rather than small molecules. A major portion of these are produced using a host cell system. Host cells express many of their own proteins that can easily contaminate the recombinant protein drug. Traditionally, these host cell proteins (HCPs) have been measured using immunoassays, but recently, orthogonal analytical methods, particularly mass spectrometry (MS), have started to be used. This article considers some of the current methods for HCP detection, with a focus on MS.